{"gene":"LIPC","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2006,"finding":"The LIPC gene promoter is directly regulated by hepatocyte nuclear factor 4α (HNF4α) via two newly identified direct repeat elements (DR1 and DR4); PGC-1α co-activates HNF4α-dependent LIPC transcription; ARP-1 displaces HNF4α from DR1 and represses transcription; HNF1α activates LIPC through its own binding site and additively with HNF4α. Disruption of Hnf4α in mice abolishes hepatic HL mRNA expression, confirming in vivo relevance.","method":"Promoter-reporter luciferase assays, electrophoretic mobility shift assays, HNF4α antagonist (Medica 16) treatment of cells, and Hnf4α liver-specific knockout mice","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (reporter assay, EMSA, pharmacological inhibition, in vivo knockout) in a single study with strong mechanistic resolution","pmids":["16603721"],"is_preprint":false},{"year":2022,"finding":"A gain-of-function variant LIPC-E97G specifically increases the phospholipase A1 activity of hepatic lipase (without changing triglyceride lipase activity) by modifying an evolutionarily conserved motif that controls substrate access to the catalytic site, causing combined hypocholesterolemia (very low LDL-C and HDL-C) and increased lysophospholipid/phospholipid ratio in plasma. Mice overexpressing LIPC-E97G recapitulate the hypocholesterolemic phenotype and show increased catabolism of triglyceride-rich lipoproteins by extrahepatic tissues.","method":"Protein homology modeling, in vitro triglyceride lipase and phospholipase activity assays in cell culture, lipidomics/NMR lipoprotein profiling in human carriers, APOE*3.Leiden.CETP transgenic mouse overexpression model","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 1–2 — in vitro enzymatic assay with structure-informed mutagenesis rationale, human carrier lipidomics, and in vivo mouse model, multiple orthogonal methods","pmids":["35899625"],"is_preprint":false},{"year":1997,"finding":"Genetic variation at the LIPC locus accounts for approximately 25% of interindividual variation in plasma HDL-C levels in American white families; four novel 5′-flanking polymorphisms in complete linkage disequilibrium define a rare LIPC allele associated with elevated plasma HDL-C and apolipoprotein AI in men, with the effect more pronounced in homozygotes.","method":"Linkage analysis in nuclear families, DNA sequencing of the LIPC 5′ flanking region, population association studies replicated in an independent cohort","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — linkage + sequencing + replicated association; foundational study establishing LIPC as a major determinant of HDL-C","pmids":["9114024"],"is_preprint":false},{"year":1998,"finding":"The LIPC -514T allele is associated with decreased post-heparin plasma hepatic lipase activity in both African American and white American men; this allele is approximately 3-fold more frequent in African Americans, contributing to their higher plasma HDL-C concentrations.","method":"Post-heparin plasma hepatic lipase activity assay, genotyping of the -514C>T promoter polymorphism, population comparison study","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — direct enzymatic activity measurement linked to genotype; single study, replicated across two ethnic populations","pmids":["9469601"],"is_preprint":false},{"year":1998,"finding":"The LIPC -514 polymorphism does not influence the androgenic stimulation of hepatic lipase activity: homozygous -514T and -514C men showed similar increases in hepatic lipase activity in response to anabolic steroid (stanozolol) treatment, and the effect of the polymorphism on HL activity was quantitatively similar in both sexes, indicating its impact is independent of androgen signaling.","method":"Pharmacological androgen challenge (stanozolol administration), post-heparin hepatic lipase activity measurement, LIPC genotyping in men and premenopausal women","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vivo enzymatic activity assay with controlled pharmacological intervention; single study","pmids":["9684756"],"is_preprint":false},{"year":1998,"finding":"Body mass index (BMI) and the LIPC -514C>T polymorphism independently and additively determine post-heparin hepatic lipase activity; higher BMI leads to increased HL activity, and this effect is additive to—not synergistic with—the effect of the -514 allele.","method":"Post-heparin hepatic lipase activity assay, LIPC genotyping, multivariate analysis in white and African American men","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — direct enzymatic activity measurements with genetic and anthropometric covariates; single study","pmids":["9610782"],"is_preprint":false},{"year":2003,"finding":"Atorvastatin dose-dependently decreases hepatic lipase activity in type 2 diabetes (−11% at 10 mg, −22% at 80 mg); the magnitude of this reduction is independent of sex and the LIPC C→T promoter variant, demonstrating a statin effect on HL that is separable from genotype-driven variation.","method":"Double-blind, randomized, placebo-controlled trial with post-heparin hepatic lipase activity measurement and LIPC genotyping","journal":"Diabetes care","confidence":"Medium","confidence_rationale":"Tier 2 — randomized controlled trial with direct enzymatic activity endpoint; single study","pmids":["12547874"],"is_preprint":false},{"year":2001,"finding":"Interaction between the LIPC -514C>T and APOC3 -482C>T promoter variants influences glucose tolerance: carriers of at least one rare allele of both genes showed the highest peak glucose and area-under-the-curve for glucose and insulin during oral glucose tolerance testing, as well as highest diastolic blood pressure, revealing a gene–gene interaction affecting insulin sensitivity.","method":"Oral glucose tolerance testing, post-heparin lipase activity, genotyping for LIPC and APOC3 promoter variants in 714 young healthy males (EARS-II cohort)","journal":"Annals of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — functional metabolic phenotyping linked to genotype interaction; single study","pmids":["11427182"],"is_preprint":false},{"year":1986,"finding":"Subcutaneous pentosan polysulphate (heparin analogue) releases hepatic triglyceride lipase (HTGL/HL) into plasma; purified HTGL added to plasma markedly enhances anti-Factor Xa clotting activity and inhibits lipid peroxide-induced thrombin generation by ~70%, demonstrating a direct anticoagulant function of HL beyond its lipase activity.","method":"In vivo administration to normal volunteers, post-heparin plasma lipase activity measurement, in vitro addition of purified HTGL to plasma, anti-Xa and thrombin generation assays","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — purified enzyme functional assay in plasma; single study with in vivo and in vitro components","pmids":["2433786"],"is_preprint":false},{"year":2002,"finding":"Hepatic lipase (HL) has a triglyceride lipase to phospholipase activity ratio of 24.1, placing it between lipoprotein lipase (ratio ~140) and endothelial lipase (ratio ~0.65); HL does not require apolipoprotein C-II for activation and efficiently hydrolyzes triglyceride-rich lipoproteins (chylomicrons, VLDL, IDL); unlike LPL, HL activity is not inhibited by 1 M NaCl.","method":"Radiolabeled lipid substrate assays (triglyceride and phospholipase activities) using conditioned medium from cells expressing recombinant HL, LPL, and EL; apoC-II dependence and salt inhibition tests; isolated lipoprotein fraction hydrolysis assays","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro enzymatic characterization with multiple substrates and direct comparisons; rigorous biochemical methods","pmids":["12032167"],"is_preprint":false},{"year":2022,"finding":"The microRNA miR-27b directly downregulates LIPC expression in hepatic cells; miR-27b also regulates the LIPC transcriptional activators HNF4α, PPARα, and Jun. LIPC knockdown increases intracellular triglyceride levels and facilitates HCV replication, while LIPC overexpression reduces intracellular triglycerides, demonstrating that LIPC-mediated triglyceride degradation impedes the HCV life cycle.","method":"Activity-based protein profiling with serine hydrolase probe, stable isotope labeling and mass spectrometry, miRNA mimic/inhibitor transfection, LIPC knockdown and overexpression, HCV infection assays, intracellular triglyceride quantification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — activity-based proteomics plus functional genetic manipulation with viral infection readout; multiple orthogonal methods in a single study","pmids":["35483451"],"is_preprint":false},{"year":2009,"finding":"A novel heterozygous LIPC missense mutation G119S was identified in a Thai subject with hyperalphalipoproteinemia and low hepatic lipase activity; the mutation occurs in a functionally important domain, is evolutionarily conserved, and is predicted damaging, consistent with loss-of-function causing elevated HDL-C.","method":"Post-heparin hepatic lipase activity measurement, sequencing of all LIPC coding regions and exon-intron junctions, evolutionary conservation analysis, computational functional prediction","journal":"Metabolism: clinical and experimental","confidence":"Low","confidence_rationale":"Tier 3–4 — variant identified by sequencing with computational prediction; no direct in vitro enzymatic validation of G119S","pmids":["19428034"],"is_preprint":false},{"year":2021,"finding":"LIPC promoter SNPs (particularly rs10468017) are associated with plasma levels of specific phosphatidylethanolamine glycerophospholipid metabolites, supporting a role for LIPC in glycerophospholipid metabolism relevant to AMD pathogenesis.","method":"Metabolite quantitative trait loci (met-QTL) analysis combining SNP genotyping and mass spectrometry-based metabolomics in AMD patients and controls; linear regression with meta-analysis","journal":"Ophthalmology science","confidence":"Low","confidence_rationale":"Tier 4 — genomic-metabolomic association; no direct enzymatic or functional experiment","pmids":["34382031"],"is_preprint":false}],"current_model":"LIPC encodes hepatic lipase (HL), a liver-expressed serine lipase with both triglyceride lipase and phospholipase A1 activities (TG:PL ratio ~24:1) that does not require apoC-II for activation; its transcription is driven by HNF4α (via DR1/DR4 elements), co-activated by PGC-1α, repressed by ARP-1, and further activated by HNF1α, while miR-27b post-transcriptionally suppresses LIPC by also downregulating HNF4α, PPARα, and Jun; functional promoter variants (notably -514C>T/-480T) reduce HL activity and raise HDL-C levels additively with BMI effects and independently of androgen signaling; a gain-of-function variant (E97G) specifically hyperactivates the phospholipase activity through modification of a substrate-access motif, causing combined hypocholesterolemia; and HL-mediated intracellular triglyceride degradation impedes HCV replication, pointing to a broader role in hepatic lipid homeostasis beyond lipoprotein remodeling."},"narrative":{"teleology":[{"year":1986,"claim":"Establishing that hepatic lipase has functions beyond lipid hydrolysis, purified HL was shown to enhance anti-Factor Xa activity and inhibit thrombin generation in plasma, revealing a direct anticoagulant role.","evidence":"Purified HTGL added to human plasma with in vitro anti-Xa and thrombin generation assays, plus in vivo release by pentosan polysulphate in volunteers","pmids":["2433786"],"confidence":"Medium","gaps":["Anticoagulant mechanism not structurally resolved","No in vivo demonstration of physiological relevance of HL anticoagulant activity","Interaction partners in the coagulation cascade not identified"]},{"year":1997,"claim":"Linkage and association studies established LIPC as a major genetic determinant of plasma HDL-C, with promoter polymorphisms accounting for ~25% of interindividual HDL-C variation and the −514T allele linked to reduced HL activity and elevated HDL-C across ethnic groups.","evidence":"Family-based linkage analysis, LIPC 5′ flanking sequencing, replicated population association studies, and post-heparin HL activity assays in white and African American cohorts","pmids":["9114024","9469601"],"confidence":"High","gaps":["Promoter variant effect on transcription factor binding not yet resolved at this time","Causal chain from reduced HL activity to HDL-C elevation not fully delineated"]},{"year":1998,"claim":"Pharmacological and anthropometric studies demonstrated that the −514C>T effect on HL activity is independent of androgen signaling and additive with BMI, clarifying that LIPC genotype and metabolic state regulate HL through separable pathways.","evidence":"Stanozolol challenge with post-heparin HL activity in men and women; multivariate analysis of BMI and genotype effects on HL activity","pmids":["9684756","9610782"],"confidence":"Medium","gaps":["Molecular mechanism by which BMI increases HL activity unknown","Sex-hormone receptor interaction with the LIPC promoter not tested directly"]},{"year":2002,"claim":"Biochemical characterization placed HL's enzymatic specificity between LPL and endothelial lipase, defining its TG:PL ratio (~24:1), apoC-II independence, and salt resistance, establishing its unique niche in lipoprotein remodeling.","evidence":"Radiolabeled substrate assays with recombinant HL, LPL, and EL; apoC-II dependence and NaCl inhibition tests","pmids":["12032167"],"confidence":"High","gaps":["No crystal structure available to explain substrate selectivity at atomic resolution","In vivo substrate preferences on native lipoproteins not quantified"]},{"year":2006,"claim":"The transcriptional regulation of LIPC was resolved: HNF4α drives transcription via DR1/DR4 elements with PGC-1α co-activation, ARP-1 displaces HNF4α for repression, and HNF1α provides additive activation — confirmed by Hnf4α liver-specific knockout abolishing HL expression.","evidence":"Promoter-reporter assays, EMSA, Medica 16 HNF4α antagonist treatment, Hnf4α liver-specific knockout mice","pmids":["16603721"],"confidence":"High","gaps":["Chromatin-level regulation (histone modifications, enhancer contacts) not addressed","How the −514C>T variant intersects with HNF4α/DR1 binding not directly tested"]},{"year":2022,"claim":"Two studies expanded LIPC biology: miR-27b was identified as a post-transcriptional suppressor of LIPC (also targeting its activators HNF4α, PPARα, Jun), and intracellular HL-mediated triglyceride degradation was shown to impede HCV replication; separately, the E97G gain-of-function variant was shown to selectively hyperactivate phospholipase A1 activity via a substrate-access motif, causing combined hypocholesterolemia in humans and mice.","evidence":"Activity-based serine hydrolase proteomics, miRNA mimics/inhibitors, LIPC knockdown/overexpression with HCV infection assays; protein homology modeling, in vitro lipase/phospholipase assays, human carrier lipidomics, APOE*3.Leiden.CETP mouse overexpression","pmids":["35483451","35899625"],"confidence":"High","gaps":["Structural basis of E97G phospholipase selectivity not confirmed by crystal structure","Whether miR-27b regulation of LIPC is relevant in non-HCV hepatic contexts is untested","Intracellular HL trafficking and compartmentalization poorly defined"]},{"year":null,"claim":"No high-resolution structure of hepatic lipase exists; the structural basis for differential TG vs. phospholipase substrate selectivity, the mechanism by which intracellular HL accesses lipid droplet triglycerides, and the physiological significance of HL's anticoagulant activity remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure","Intracellular lipid droplet access mechanism unknown","In vivo relevance of HL anticoagulant function not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[1,9,10]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[9,1]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[8,9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,9,10]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[8]}],"complexes":[],"partners":["HNF4A","PPARGC1A","NR2F2","HNF1A"],"other_free_text":[]},"mechanistic_narrative":"LIPC encodes hepatic lipase (HL), a liver-expressed serine lipase that hydrolyzes triglycerides and phospholipids in circulating lipoproteins (TG:PL activity ratio ~24:1) without requiring apolipoprotein C-II as a cofactor, and is a major determinant of plasma HDL-C levels [PMID:12032167, PMID:9114024]. Its transcription is driven by HNF4α acting on DR1 and DR4 promoter elements, co-activated by PGC-1α, repressed by ARP-1, and further activated by HNF1α, while post-transcriptional regulation by miR-27b downregulates LIPC and its upstream activators HNF4α, PPARα, and Jun [PMID:16603721, PMID:35483451]. Common promoter variants (notably −514C>T) reduce HL activity and raise HDL-C additively with BMI effects and independently of androgen signaling, while the rare gain-of-function E97G variant selectively hyperactivates phospholipase A1 activity through a substrate-access motif, causing combined hypocholesterolemia [PMID:9469601, PMID:35899625]. Beyond extracellular lipoprotein remodeling, HL-mediated intracellular triglyceride degradation in hepatocytes impedes hepatitis C virus replication, and HL released into plasma enhances anti-Factor Xa anticoagulant activity [PMID:35483451, PMID:2433786]."},"prefetch_data":{"uniprot":{"accession":"P11150","full_name":"Hepatic triacylglycerol lipase","aliases":["Lipase member C","Lysophospholipase","Phospholipase A1"],"length_aa":499,"mass_kda":55.9,"function":"Catalyzes the hydrolysis of triglycerides and phospholipids present in circulating plasma lipoproteins, including chylomicrons, intermediate density lipoproteins (IDL), low density lipoproteins (LDL) of large size and high density lipoproteins (HDL), releasing free fatty acids (FFA) and smaller lipoprotein particles (PubMed:12032167, PubMed:26193433, PubMed:7592706, PubMed:8798474). Also exhibits lysophospholipase activity (By similarity). Can hydrolyze both neutral lipid and phospholipid substrates but shows a greater binding affinity for neutral lipid substrates than phospholipid substrates (By similarity). In native LDL, preferentially hydrolyzes the phosphatidylcholine species containing polyunsaturated fatty acids at sn-2 position (PubMed:26193433)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P11150/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LIPC","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/LIPC","total_profiled":1310},"omim":[{"mim_id":"614025","title":"HEPATIC LIPASE DEFICIENCY","url":"https://www.omim.org/entry/614025"},{"mim_id":"612797","title":"HIGH DENSITY LIPOPROTEIN CHOLESTEROL LEVEL QUANTITATIVE TRAIT LOCUS 12; HDLCQ12","url":"https://www.omim.org/entry/612797"},{"mim_id":"606613","title":"HIGH DENSITY LIPOPROTEIN CHOLESTEROL LEVEL QUANTITATIVE TRAIT LOCUS 1; HDLCQ1","url":"https://www.omim.org/entry/606613"},{"mim_id":"605552","title":"ABDOMINAL OBESITY-METABOLIC SYNDROME 1; AOMS1","url":"https://www.omim.org/entry/605552"},{"mim_id":"603684","title":"LIPASE, ENDOTHELIAL; LIPG","url":"https://www.omim.org/entry/603684"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"liver","ntpm":159.9}],"url":"https://www.proteinatlas.org/search/LIPC"},"hgnc":{"alias_symbol":["HL","HTGL"],"prev_symbol":[]},"alphafold":{"accession":"P11150","domains":[{"cath_id":"3.40.50.1820","chopping":"48-342","consensus_level":"high","plddt":90.6059,"start":48,"end":342},{"cath_id":"2.60.60.20","chopping":"353-425_446-487","consensus_level":"high","plddt":85.2357,"start":353,"end":487}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P11150","model_url":"https://alphafold.ebi.ac.uk/files/AF-P11150-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P11150-F1-predicted_aligned_error_v6.png","plddt_mean":82.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LIPC","jax_strain_url":"https://www.jax.org/strain/search?query=LIPC"},"sequence":{"accession":"P11150","fasta_url":"https://rest.uniprot.org/uniprotkb/P11150.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P11150/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P11150"}},"corpus_meta":[{"pmid":"20385826","id":"PMC_20385826","title":"Genome-wide association study of advanced age-related macular degeneration identifies a role of the hepatic lipase gene (LIPC).","date":"2010","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/20385826","citation_count":375,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"7622447","id":"PMC_7622447","title":"Peroxynitrite-induced apoptosis in HL-60 cells.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7622447","citation_count":278,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9114024","id":"PMC_9114024","title":"A hepatic lipase (LIPC) allele associated with high plasma concentrations of high density lipoprotein cholesterol.","date":"1997","source":"Proceedings of the National Academy of Sciences of the United States of 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of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/20385819","citation_count":433,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20139978","id":"PMC_20139978","title":"Genome-wide association study of hematological and biochemical traits in a Japanese population.","date":"2010","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20139978","citation_count":406,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20864672","id":"PMC_20864672","title":"Genetic variants influencing circulating lipid levels and risk of coronary artery disease.","date":"2010","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/20864672","citation_count":351,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"23251661","id":"PMC_23251661","title":"Novel genetic loci identified for the pathophysiology of childhood obesity in the Hispanic population.","date":"2012","source":"PloS 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human red blood cell.","date":"2012","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/23222517","citation_count":266,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21347282","id":"PMC_21347282","title":"Genome-wide association study of coronary heart disease and its risk factors in 8,090 African Americans: the NHLBI CARe Project.","date":"2011","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21347282","citation_count":258,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"12032167","id":"PMC_12032167","title":"Characterization of the lipolytic activity of endothelial lipase.","date":"2002","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/12032167","citation_count":228,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21665990","id":"PMC_21665990","title":"Common variants near FRK/COL10A1 and VEGFA are associated with advanced age-related macular degeneration.","date":"2011","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21665990","citation_count":208,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21988832","id":"PMC_21988832","title":"Toward an understanding of the protein interaction network of the human liver.","date":"2011","source":"Molecular systems biology","url":"https://pubmed.ncbi.nlm.nih.gov/21988832","citation_count":207,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"21386085","id":"PMC_21386085","title":"A bivariate genome-wide approach to metabolic syndrome: STAMPEED consortium.","date":"2011","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/21386085","citation_count":205,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"20682687","id":"PMC_20682687","title":"Common variants in 40 genes assessed for diabetes incidence and response to metformin and lifestyle intervention in the diabetes prevention program.","date":"2010","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/20682687","citation_count":196,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47748,"output_tokens":2736,"usd":0.092142},"stage2":{"model":"claude-opus-4-6","input_tokens":6159,"output_tokens":2127,"usd":0.125955},"total_usd":0.480259,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":62370,"output_tokens":4588,"usd":0.127965},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":7223,"output_tokens":2134,"usd":0.134197}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"Genetic variation in the LIPC gene (hepatic lipase) is a major determinant of plasma HDL-C levels; linkage analysis in nuclear families indicated allelic variation at LIPC accounts for ~25% of the variation in plasma HDL-C concentrations, and sequencing identified a 5'-flanking promoter allele associated with higher HDL-C and apolipoprotein AI concentrations.\",\n      \"method\": \"Linkage analysis, DNA sequencing, association study in human families\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — replicated in independent sample, multiple genetic methods with functional endpoint (hepatic lipase activity and HDL-C levels)\",\n      \"pmids\": [\"9114024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The LIPC -514T promoter allele is associated with significantly lower post-heparin hepatic lipase activity in both African American and white American men, and the higher frequency of this allele in African Americans contributes to ethnic differences in plasma HDL-C concentrations.\",\n      \"method\": \"Post-heparin plasma hepatic lipase activity measurement, genotyping, association study\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional enzyme activity measured in two distinct populations with consistent results\",\n      \"pmids\": [\"9469601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Body mass index (BMI) positively and independently correlates with hepatic lipase activity, acting additively and independently from the LIPC -514 promoter polymorphism, demonstrating that hepatic lipase activity is a multifactorial trait.\",\n      \"method\": \"Post-heparin hepatic lipase activity measurement, genotyping, multivariate analysis\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional activity measured but single study, no mechanistic reconstitution\",\n      \"pmids\": [\"9610782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The LIPC -514C to T polymorphism does not influence the response of hepatic lipase activity to androgens (stanozolol treatment), indicating that the polymorphism's effects on hepatic lipase activity are independent of androgen action.\",\n      \"method\": \"Anabolic steroid treatment experiment in -514T and -514C homozygous men with post-heparin hepatic lipase activity measurement\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo pharmacological experiment, small sample size (n=10)\",\n      \"pmids\": [\"9684756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Atorvastatin dose-dependently decreases hepatic lipase activity in type 2 diabetes; sex and the LIPC C-514T promoter variant significantly influence baseline hepatic lipase activity but not the atorvastatin response.\",\n      \"method\": \"Double-blind, randomized, placebo-controlled trial with post-heparin hepatic lipase activity measurement and genotyping\",\n      \"journal\": \"Diabetes care\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — randomized controlled trial with functional enzyme activity measurements in a large cohort (n=198)\",\n      \"pmids\": [\"12547874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The LIPC gene promoter is directly regulated by HNF4α via two newly identified direct repeat elements (DR1 and DR4); PGC-1α stimulates HNF4α-dependent LIPC transactivation; ARP-1 displaces HNF4α from DR1 and blocks activation; HNF1α requires its binding site and has an additive effect with HNF4α. Disruption of Hnf4α in mice prevents hepatic HL mRNA expression.\",\n      \"method\": \"Reporter assay, transcription factor cotransfection, HNF4α antagonist treatment, Hnf4α conditional knockout mouse\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including promoter reporter assays, mutagenesis of binding sites, pharmacological antagonism, and in vivo mouse knockout\",\n      \"pmids\": [\"16603721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Gene-gene interaction between the LIPC -514C>T and APOC3 -482C>T promoter variants affects glucose tolerance parameters (peak and area under the curve for glucose and insulin during oral glucose tolerance testing) and diastolic blood pressure in healthy young males, indicating a functional interaction between hepatic lipase and apoC-III pathways.\",\n      \"method\": \"Genetic association study with oral glucose tolerance testing in EARS-II cohort\",\n      \"journal\": \"Annals of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic association with functional metabolic readout, single cohort\",\n      \"pmids\": [\"11427182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A novel missense mutation in LIPC (G119S) occurring in a functionally important domain results in reduced hepatic lipase activity and elevated HDL-C levels (hyperalphalipoproteinemia) in Thai subjects.\",\n      \"method\": \"Resequencing, functional HL activity measurement, evolutionary conservation analysis\",\n      \"journal\": \"Metabolism: clinical and experimental\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genetic variant identified with activity measurement, no in vitro reconstitution of mutant\",\n      \"pmids\": [\"19428034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A gain-of-function LIPC variant (E97G) specifically increases the phospholipase activity of hepatic lipase by modifying an evolutionarily conserved motif that controls substrate access to the catalytic site, leading to familial combined hypocholesterolemia with reduced LDL-C and HDL-C. Increased phospholipase activity promotes catabolism of triglyceride-rich lipoproteins by extrahepatic tissues but not liver.\",\n      \"method\": \"Protein homology modeling, in vitro cell culture phospholipase and triglyceride lipase activity assays, APOE*3.Leiden.CETP mouse overexpression model, NMR-based lipoprotein profiling and lipidomics in family members\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including in vitro enzymatic assays, structural modeling, and in vivo mouse studies with mechanistic follow-up\",\n      \"pmids\": [\"35899625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-27b negatively regulates LIPC expression and activity in human liver cells; miR-27b also regulates transcription factors Jun, PPARα, and HNF4α that control LIPC levels. Downregulation of LIPC by miR-27b reduces intracellular triglyceride degradation, thereby increasing cellular lipid levels that support HCV replication.\",\n      \"method\": \"Activity-based protein profiling with serine hydrolase probe, stable isotope labeling, mass spectrometry, miRNA mimic and inhibitor experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — activity-based proteomic profiling plus miRNA gain/loss-of-function with functional lipid metabolism readout, multiple orthogonal approaches\",\n      \"pmids\": [\"35483451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LIPC gene polymorphisms are associated with plasma phosphatidylethanolamine (glycerophospholipid) metabolite levels, supporting a role for LIPC in the glycerophospholipid metabolic pathway beyond HDL metabolism.\",\n      \"method\": \"Genome-metabolome association study (met-QTL analysis), mass spectrometry metabolomics, linear regression with meta-analysis\",\n      \"journal\": \"Ophthalmology science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — association study linking LIPC variants to specific metabolites; mechanistic inference but no direct enzymatic assay\",\n      \"pmids\": [\"34382031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"Subcutaneous pentosan polysulphate releases hepatic triglyceride lipase (HTGL/hepatic lipase) into plasma; in vitro addition of purified HTGL to plasma enhances anti-Factor Xa clotting activity and inhibits lipid peroxide-induced thrombin generation by ~70%, demonstrating a direct anticoagulant function of released hepatic lipase.\",\n      \"method\": \"In vivo subcutaneous injection in volunteers, in vitro addition of purified HTGL to plasma, clotting activity assays\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro reconstitution with purified enzyme plus in vivo release experiment; single study\",\n      \"pmids\": [\"2433786\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LIPC encodes hepatic lipase, a serine lipase with both triglyceride lipase and phospholipase activities that plays a central role in HDL and LDL cholesterol metabolism; its promoter is transcriptionally regulated by HNF4α (via DR1/DR4 elements), PGC-1α, ARP-1, and HNF1α, its expression and activity are post-transcriptionally suppressed by miR-27b (which also regulates upstream transcription factors Jun, PPARα, and HNF4α), and gain-of-function variants (e.g., E97G) that alter substrate access to the catalytic site specifically enhance phospholipase activity to drive combined hypocholesterolemia, while common promoter variants (e.g., -514C>T) reduce hepatic lipase activity and raise HDL-C levels in an androgen-independent but BMI- and statin-sensitive manner.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll systematically classify each paper before extracting discoveries.\n\n**Classification:**\n\n**KEEP (papers about canonical LIPC - hepatic lipase gene):**\n- [1] PMID:20385826 - GWAS identifying LIPC rs10468017 in AMD ✓\n- [3] PMID:9114024 - LIPC allele and HDL-C levels ✓\n- [6] PMID:9469601 - Hepatic lipase activity and LIPC -514T polymorphism ✓\n- [17] PMID:21139980 - LIPC rs10468017 and AMD ✓\n- [26] PMID:10487498 - LIPC -480T promoter variant ✓\n- [29] PMID:9610782 - LIPC -514 polymorphism and BMI interaction ✓\n- [33] PMID:26503844 - CETP/LPL/LIPC polymorphisms and AMD ✓\n- [35] PMID:16603721 - Transcriptional regulation of LIPC gene promoter ✓\n- [37] PMID:12547874 - Atorvastatin effects on hepatic lipase activity ✓\n- [39] PMID:23181436 - LIPC-250 G/A and Alzheimer's disease ✓\n- [52] PMID:21252145 - Physical activity modifies LPL/LIPC/CETP effects ✓\n- [58] PMID:11427182 - LIPC -514C>T and APOC3 interaction on glucose tolerance ✓\n- [61] PMID:2433786 - Pentosan polysulphate releasing hepatic triglyceride lipase ✓\n- [64] PMID:9684756 - LIPC -514 polymorphism and androgen effects ✓\n- [72] PMID:25550127 - LIPC C-514T and cardiometabolic parameters ✓\n- [76] PMID:20222961 - LIPC -250G>A and serum lipids ✓\n- [81] PMID:34382031 - LIPC SNPs and glycerophospholipid metabolites ✓\n- [89] PMID:35899625 - LIPC-E97G gain-of-function variant ✓\n- [91] PMID:19428034 - CETP and LIPC mutations in hyperalphalipoproteinemia ✓\n- [96] PMID:19367320 - Post-heparin lipase testing and LIPC variants ✓\n- [97] PMID:22464213 - CETP, LIPC, LIPG resequencing ✓\n- [98] PMID:35483451 - miR-27b regulates LIPC ✓\n\n**From gene2pubmed curated:**\n- [26] PMID:12032167 - Characterization of endothelial lipase vs HL ✓\n- [18] PMID:20685819 - LIPC in AMD (Chen et al.) ✓\n\n**EXCLUDE - Alias collisions (HL-60 cell line, HL-A antigens, HL-1 cardiomyocytes, bacterial LipC, other HL genes):**\n- Papers [2],[4],[5],[7],[8],[9],[11],[12],[13],[14],[15],[16],[18],[19],[20],[21],[22],[23],[24],[25],[27],[28],[30],[31],[32],[34],[36],[38],[40],[41],[42],[43],[44],[45],[46],[47],[48],[49],[50],[51],[53],[54],[55],[56],[57],[59],[60],[62],[63],[65],[66],[67],[68],[69],[70],[71],[73],[74],[75],[77],[78],[79],[80],[82],[83],[84],[85],[86],[87],[88],[90],[92],[93],[94],[95],[99],[100] — all EXCLUDE (HL-60, HL-A, HL-1, bacterial lipC, or other gene aliases)\n- gene2pubmed [82] PMID:9817922 - \"HL\" = 3-hydroxy-3-methylglutaryl-CoA lyase, not LIPC — EXCLUDE\n\nNow extracting discoveries from KEPT papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"The LIPC gene promoter is directly regulated by hepatocyte nuclear factor 4α (HNF4α) via two newly identified direct repeat elements (DR1 and DR4); PGC-1α co-activates HNF4α-dependent LIPC transcription; ARP-1 displaces HNF4α from DR1 and represses transcription; HNF1α activates LIPC through its own binding site and additively with HNF4α. Disruption of Hnf4α in mice abolishes hepatic HL mRNA expression, confirming in vivo relevance.\",\n      \"method\": \"Promoter-reporter luciferase assays, electrophoretic mobility shift assays, HNF4α antagonist (Medica 16) treatment of cells, and Hnf4α liver-specific knockout mice\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (reporter assay, EMSA, pharmacological inhibition, in vivo knockout) in a single study with strong mechanistic resolution\",\n      \"pmids\": [\"16603721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A gain-of-function variant LIPC-E97G specifically increases the phospholipase A1 activity of hepatic lipase (without changing triglyceride lipase activity) by modifying an evolutionarily conserved motif that controls substrate access to the catalytic site, causing combined hypocholesterolemia (very low LDL-C and HDL-C) and increased lysophospholipid/phospholipid ratio in plasma. Mice overexpressing LIPC-E97G recapitulate the hypocholesterolemic phenotype and show increased catabolism of triglyceride-rich lipoproteins by extrahepatic tissues.\",\n      \"method\": \"Protein homology modeling, in vitro triglyceride lipase and phospholipase activity assays in cell culture, lipidomics/NMR lipoprotein profiling in human carriers, APOE*3.Leiden.CETP transgenic mouse overexpression model\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — in vitro enzymatic assay with structure-informed mutagenesis rationale, human carrier lipidomics, and in vivo mouse model, multiple orthogonal methods\",\n      \"pmids\": [\"35899625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Genetic variation at the LIPC locus accounts for approximately 25% of interindividual variation in plasma HDL-C levels in American white families; four novel 5′-flanking polymorphisms in complete linkage disequilibrium define a rare LIPC allele associated with elevated plasma HDL-C and apolipoprotein AI in men, with the effect more pronounced in homozygotes.\",\n      \"method\": \"Linkage analysis in nuclear families, DNA sequencing of the LIPC 5′ flanking region, population association studies replicated in an independent cohort\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — linkage + sequencing + replicated association; foundational study establishing LIPC as a major determinant of HDL-C\",\n      \"pmids\": [\"9114024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The LIPC -514T allele is associated with decreased post-heparin plasma hepatic lipase activity in both African American and white American men; this allele is approximately 3-fold more frequent in African Americans, contributing to their higher plasma HDL-C concentrations.\",\n      \"method\": \"Post-heparin plasma hepatic lipase activity assay, genotyping of the -514C>T promoter polymorphism, population comparison study\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct enzymatic activity measurement linked to genotype; single study, replicated across two ethnic populations\",\n      \"pmids\": [\"9469601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The LIPC -514 polymorphism does not influence the androgenic stimulation of hepatic lipase activity: homozygous -514T and -514C men showed similar increases in hepatic lipase activity in response to anabolic steroid (stanozolol) treatment, and the effect of the polymorphism on HL activity was quantitatively similar in both sexes, indicating its impact is independent of androgen signaling.\",\n      \"method\": \"Pharmacological androgen challenge (stanozolol administration), post-heparin hepatic lipase activity measurement, LIPC genotyping in men and premenopausal women\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo enzymatic activity assay with controlled pharmacological intervention; single study\",\n      \"pmids\": [\"9684756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Body mass index (BMI) and the LIPC -514C>T polymorphism independently and additively determine post-heparin hepatic lipase activity; higher BMI leads to increased HL activity, and this effect is additive to—not synergistic with—the effect of the -514 allele.\",\n      \"method\": \"Post-heparin hepatic lipase activity assay, LIPC genotyping, multivariate analysis in white and African American men\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct enzymatic activity measurements with genetic and anthropometric covariates; single study\",\n      \"pmids\": [\"9610782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Atorvastatin dose-dependently decreases hepatic lipase activity in type 2 diabetes (−11% at 10 mg, −22% at 80 mg); the magnitude of this reduction is independent of sex and the LIPC C→T promoter variant, demonstrating a statin effect on HL that is separable from genotype-driven variation.\",\n      \"method\": \"Double-blind, randomized, placebo-controlled trial with post-heparin hepatic lipase activity measurement and LIPC genotyping\",\n      \"journal\": \"Diabetes care\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — randomized controlled trial with direct enzymatic activity endpoint; single study\",\n      \"pmids\": [\"12547874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Interaction between the LIPC -514C>T and APOC3 -482C>T promoter variants influences glucose tolerance: carriers of at least one rare allele of both genes showed the highest peak glucose and area-under-the-curve for glucose and insulin during oral glucose tolerance testing, as well as highest diastolic blood pressure, revealing a gene–gene interaction affecting insulin sensitivity.\",\n      \"method\": \"Oral glucose tolerance testing, post-heparin lipase activity, genotyping for LIPC and APOC3 promoter variants in 714 young healthy males (EARS-II cohort)\",\n      \"journal\": \"Annals of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional metabolic phenotyping linked to genotype interaction; single study\",\n      \"pmids\": [\"11427182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"Subcutaneous pentosan polysulphate (heparin analogue) releases hepatic triglyceride lipase (HTGL/HL) into plasma; purified HTGL added to plasma markedly enhances anti-Factor Xa clotting activity and inhibits lipid peroxide-induced thrombin generation by ~70%, demonstrating a direct anticoagulant function of HL beyond its lipase activity.\",\n      \"method\": \"In vivo administration to normal volunteers, post-heparin plasma lipase activity measurement, in vitro addition of purified HTGL to plasma, anti-Xa and thrombin generation assays\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — purified enzyme functional assay in plasma; single study with in vivo and in vitro components\",\n      \"pmids\": [\"2433786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Hepatic lipase (HL) has a triglyceride lipase to phospholipase activity ratio of 24.1, placing it between lipoprotein lipase (ratio ~140) and endothelial lipase (ratio ~0.65); HL does not require apolipoprotein C-II for activation and efficiently hydrolyzes triglyceride-rich lipoproteins (chylomicrons, VLDL, IDL); unlike LPL, HL activity is not inhibited by 1 M NaCl.\",\n      \"method\": \"Radiolabeled lipid substrate assays (triglyceride and phospholipase activities) using conditioned medium from cells expressing recombinant HL, LPL, and EL; apoC-II dependence and salt inhibition tests; isolated lipoprotein fraction hydrolysis assays\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro enzymatic characterization with multiple substrates and direct comparisons; rigorous biochemical methods\",\n      \"pmids\": [\"12032167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The microRNA miR-27b directly downregulates LIPC expression in hepatic cells; miR-27b also regulates the LIPC transcriptional activators HNF4α, PPARα, and Jun. LIPC knockdown increases intracellular triglyceride levels and facilitates HCV replication, while LIPC overexpression reduces intracellular triglycerides, demonstrating that LIPC-mediated triglyceride degradation impedes the HCV life cycle.\",\n      \"method\": \"Activity-based protein profiling with serine hydrolase probe, stable isotope labeling and mass spectrometry, miRNA mimic/inhibitor transfection, LIPC knockdown and overexpression, HCV infection assays, intracellular triglyceride quantification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — activity-based proteomics plus functional genetic manipulation with viral infection readout; multiple orthogonal methods in a single study\",\n      \"pmids\": [\"35483451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A novel heterozygous LIPC missense mutation G119S was identified in a Thai subject with hyperalphalipoproteinemia and low hepatic lipase activity; the mutation occurs in a functionally important domain, is evolutionarily conserved, and is predicted damaging, consistent with loss-of-function causing elevated HDL-C.\",\n      \"method\": \"Post-heparin hepatic lipase activity measurement, sequencing of all LIPC coding regions and exon-intron junctions, evolutionary conservation analysis, computational functional prediction\",\n      \"journal\": \"Metabolism: clinical and experimental\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3–4 — variant identified by sequencing with computational prediction; no direct in vitro enzymatic validation of G119S\",\n      \"pmids\": [\"19428034\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LIPC promoter SNPs (particularly rs10468017) are associated with plasma levels of specific phosphatidylethanolamine glycerophospholipid metabolites, supporting a role for LIPC in glycerophospholipid metabolism relevant to AMD pathogenesis.\",\n      \"method\": \"Metabolite quantitative trait loci (met-QTL) analysis combining SNP genotyping and mass spectrometry-based metabolomics in AMD patients and controls; linear regression with meta-analysis\",\n      \"journal\": \"Ophthalmology science\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — genomic-metabolomic association; no direct enzymatic or functional experiment\",\n      \"pmids\": [\"34382031\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LIPC encodes hepatic lipase (HL), a liver-expressed serine lipase with both triglyceride lipase and phospholipase A1 activities (TG:PL ratio ~24:1) that does not require apoC-II for activation; its transcription is driven by HNF4α (via DR1/DR4 elements), co-activated by PGC-1α, repressed by ARP-1, and further activated by HNF1α, while miR-27b post-transcriptionally suppresses LIPC by also downregulating HNF4α, PPARα, and Jun; functional promoter variants (notably -514C>T/-480T) reduce HL activity and raise HDL-C levels additively with BMI effects and independently of androgen signaling; a gain-of-function variant (E97G) specifically hyperactivates the phospholipase activity through modification of a substrate-access motif, causing combined hypocholesterolemia; and HL-mediated intracellular triglyceride degradation impedes HCV replication, pointing to a broader role in hepatic lipid homeostasis beyond lipoprotein remodeling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LIPC encodes hepatic lipase, a secreted serine lipase that possesses both triglyceride lipase and phospholipase activities and is a central determinant of plasma HDL-C and LDL-C concentrations. Allelic variation at the LIPC promoter (notably -514C>T) accounts for approximately 25% of HDL-C variation in families by reducing hepatic lipase activity, an effect that is independent of androgen signaling but modified by BMI and statin treatment [PMID:9114024, PMID:9469601, PMID:12547874]. Transcription of LIPC is directly driven by HNF4α acting through DR1/DR4 promoter elements, co-activated by PGC-1α and HNF1α, repressed by ARP-1, and post-transcriptionally suppressed by miR-27b, which also targets the upstream regulators Jun, PPARα, and HNF4α [PMID:16603721, PMID:35483451]. A gain-of-function missense variant (E97G) that remodels substrate access to the catalytic site selectively enhances phospholipase activity, driving familial combined hypocholesterolemia by promoting extrahepatic catabolism of triglyceride-rich lipoproteins [PMID:35899625].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Establishing that hepatic lipase released into plasma has direct anticoagulant activity — enhancing anti-Factor Xa activity and inhibiting thrombin generation — revealed a function for LIPC beyond lipid metabolism.\",\n      \"evidence\": \"In vivo pentosan polysulphate injection in volunteers with in vitro reconstitution of purified hepatic lipase in plasma clotting assays\",\n      \"pmids\": [\"2433786\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study, not independently replicated\", \"Physiological relevance of anticoagulant function in vivo unclear\", \"Molecular mechanism of anti-Factor Xa enhancement not defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrating that the LIPC -514C>T promoter polymorphism is a major genetic determinant of hepatic lipase activity and HDL-C levels across ethnic groups established that common regulatory variation at LIPC drives population-level lipoprotein differences.\",\n      \"evidence\": \"Linkage analysis in families, post-heparin hepatic lipase activity measurement, and genotype-phenotype association in African American and white American cohorts\",\n      \"pmids\": [\"9114024\", \"9469601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which -514C>T alters promoter activity not defined\", \"Effect on phospholipase versus triglyceride lipase activity not separated\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showing that BMI independently and additively modulates hepatic lipase activity alongside the -514 polymorphism, and that the polymorphism's effect is androgen-independent, defined hepatic lipase activity as a multifactorial trait with distinct regulatory inputs.\",\n      \"evidence\": \"Multivariate analysis of hepatic lipase activity versus BMI and genotype; stanozolol treatment in homozygous men\",\n      \"pmids\": [\"9610782\", \"9684756\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking BMI to hepatic lipase activity unknown\", \"Small sample size (n=10) for androgen experiment\", \"Hormonal regulation pathways other than androgens not tested\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"A randomized controlled trial showing that atorvastatin dose-dependently decreases hepatic lipase activity in type 2 diabetes revealed pharmacological modifiability of LIPC function, with baseline activity influenced by sex and genotype but statin response independent of the -514 variant.\",\n      \"evidence\": \"Double-blind RCT (n=198) with post-heparin hepatic lipase activity and LIPC genotyping\",\n      \"pmids\": [\"12547874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of statin-induced hepatic lipase suppression not elucidated\", \"Whether statin effect is transcriptional or post-translational not determined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of HNF4α-responsive DR1/DR4 elements in the LIPC promoter, co-activation by PGC-1α and HNF1α, and repression by ARP-1 displacement of HNF4α established the core transcriptional regulatory circuit controlling hepatic lipase expression.\",\n      \"evidence\": \"Reporter assays, cotransfection, HNF4α antagonist, binding site mutagenesis, and Hnf4α conditional knockout mouse showing abolished HL mRNA\",\n      \"pmids\": [\"16603721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the -514C>T polymorphism interacts with these transcription factor binding sites not resolved\", \"Chromatin-level regulation and epigenetic marks not examined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The E97G gain-of-function variant was shown to specifically enhance phospholipase activity by remodeling substrate access to the catalytic site, causing familial combined hypocholesterolemia — thereby separating LIPC's phospholipase and triglyceride lipase activities as mechanistically and physiologically distinct.\",\n      \"evidence\": \"Protein homology modeling, in vitro phospholipase/TG lipase assays, APOE*3.Leiden.CETP mouse overexpression, NMR lipoprotein profiling in family members\",\n      \"pmids\": [\"35899625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure of human hepatic lipase to validate homology model\", \"Whether other variants similarly separate the two activities is unknown\", \"Extrahepatic tissue-specific uptake mechanism not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"miR-27b was identified as a post-transcriptional suppressor of LIPC, also targeting upstream transcription factors HNF4α, PPARα, and Jun, linking miRNA regulation of hepatic lipase to intracellular triglyceride metabolism and HCV replication.\",\n      \"evidence\": \"Activity-based serine hydrolase profiling, SILAC mass spectrometry, miRNA mimic/inhibitor experiments in human liver cells\",\n      \"pmids\": [\"35483451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo validation of miR-27b regulation of LIPC not performed\", \"Whether miR-27b acts primarily through direct LIPC targeting or indirectly via transcription factors not quantitatively resolved\", \"Relevance to HCV patients not confirmed clinically\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution crystal structure of human hepatic lipase is lacking, and the structural basis for selective modulation of phospholipase versus triglyceride lipase activity — and the precise mechanism by which common promoter variants alter transcription factor binding — remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No experimental 3D structure of hepatic lipase\", \"Mechanism by which -514C>T alters transcription factor occupancy unknown\", \"Relative contribution of direct miRNA targeting versus indirect transcription factor modulation to LIPC regulation in vivo unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 7, 8, 11]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [8, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [1, 8, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 8, 9, 10]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"HNF4A\",\n      \"PPARGC1A\",\n      \"NR2F2\",\n      \"HNF1A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"LIPC encodes hepatic lipase (HL), a liver-expressed serine lipase that hydrolyzes triglycerides and phospholipids in circulating lipoproteins (TG:PL activity ratio ~24:1) without requiring apolipoprotein C-II as a cofactor, and is a major determinant of plasma HDL-C levels [PMID:12032167, PMID:9114024]. Its transcription is driven by HNF4α acting on DR1 and DR4 promoter elements, co-activated by PGC-1α, repressed by ARP-1, and further activated by HNF1α, while post-transcriptional regulation by miR-27b downregulates LIPC and its upstream activators HNF4α, PPARα, and Jun [PMID:16603721, PMID:35483451]. Common promoter variants (notably −514C>T) reduce HL activity and raise HDL-C additively with BMI effects and independently of androgen signaling, while the rare gain-of-function E97G variant selectively hyperactivates phospholipase A1 activity through a substrate-access motif, causing combined hypocholesterolemia [PMID:9469601, PMID:35899625]. Beyond extracellular lipoprotein remodeling, HL-mediated intracellular triglyceride degradation in hepatocytes impedes hepatitis C virus replication, and HL released into plasma enhances anti-Factor Xa anticoagulant activity [PMID:35483451, PMID:2433786].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Establishing that hepatic lipase has functions beyond lipid hydrolysis, purified HL was shown to enhance anti-Factor Xa activity and inhibit thrombin generation in plasma, revealing a direct anticoagulant role.\",\n      \"evidence\": \"Purified HTGL added to human plasma with in vitro anti-Xa and thrombin generation assays, plus in vivo release by pentosan polysulphate in volunteers\",\n      \"pmids\": [\"2433786\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Anticoagulant mechanism not structurally resolved\", \"No in vivo demonstration of physiological relevance of HL anticoagulant activity\", \"Interaction partners in the coagulation cascade not identified\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Linkage and association studies established LIPC as a major genetic determinant of plasma HDL-C, with promoter polymorphisms accounting for ~25% of interindividual HDL-C variation and the −514T allele linked to reduced HL activity and elevated HDL-C across ethnic groups.\",\n      \"evidence\": \"Family-based linkage analysis, LIPC 5′ flanking sequencing, replicated population association studies, and post-heparin HL activity assays in white and African American cohorts\",\n      \"pmids\": [\"9114024\", \"9469601\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Promoter variant effect on transcription factor binding not yet resolved at this time\", \"Causal chain from reduced HL activity to HDL-C elevation not fully delineated\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Pharmacological and anthropometric studies demonstrated that the −514C>T effect on HL activity is independent of androgen signaling and additive with BMI, clarifying that LIPC genotype and metabolic state regulate HL through separable pathways.\",\n      \"evidence\": \"Stanozolol challenge with post-heparin HL activity in men and women; multivariate analysis of BMI and genotype effects on HL activity\",\n      \"pmids\": [\"9684756\", \"9610782\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which BMI increases HL activity unknown\", \"Sex-hormone receptor interaction with the LIPC promoter not tested directly\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Biochemical characterization placed HL's enzymatic specificity between LPL and endothelial lipase, defining its TG:PL ratio (~24:1), apoC-II independence, and salt resistance, establishing its unique niche in lipoprotein remodeling.\",\n      \"evidence\": \"Radiolabeled substrate assays with recombinant HL, LPL, and EL; apoC-II dependence and NaCl inhibition tests\",\n      \"pmids\": [\"12032167\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal structure available to explain substrate selectivity at atomic resolution\", \"In vivo substrate preferences on native lipoproteins not quantified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The transcriptional regulation of LIPC was resolved: HNF4α drives transcription via DR1/DR4 elements with PGC-1α co-activation, ARP-1 displaces HNF4α for repression, and HNF1α provides additive activation — confirmed by Hnf4α liver-specific knockout abolishing HL expression.\",\n      \"evidence\": \"Promoter-reporter assays, EMSA, Medica 16 HNF4α antagonist treatment, Hnf4α liver-specific knockout mice\",\n      \"pmids\": [\"16603721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chromatin-level regulation (histone modifications, enhancer contacts) not addressed\", \"How the −514C>T variant intersects with HNF4α/DR1 binding not directly tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two studies expanded LIPC biology: miR-27b was identified as a post-transcriptional suppressor of LIPC (also targeting its activators HNF4α, PPARα, Jun), and intracellular HL-mediated triglyceride degradation was shown to impede HCV replication; separately, the E97G gain-of-function variant was shown to selectively hyperactivate phospholipase A1 activity via a substrate-access motif, causing combined hypocholesterolemia in humans and mice.\",\n      \"evidence\": \"Activity-based serine hydrolase proteomics, miRNA mimics/inhibitors, LIPC knockdown/overexpression with HCV infection assays; protein homology modeling, in vitro lipase/phospholipase assays, human carrier lipidomics, APOE*3.Leiden.CETP mouse overexpression\",\n      \"pmids\": [\"35483451\", \"35899625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of E97G phospholipase selectivity not confirmed by crystal structure\", \"Whether miR-27b regulation of LIPC is relevant in non-HCV hepatic contexts is untested\", \"Intracellular HL trafficking and compartmentalization poorly defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"No high-resolution structure of hepatic lipase exists; the structural basis for differential TG vs. phospholipase substrate selectivity, the mechanism by which intracellular HL accesses lipid droplet triglycerides, and the physiological significance of HL's anticoagulant activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure\", \"Intracellular lipid droplet access mechanism unknown\", \"In vivo relevance of HL anticoagulant function not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [1, 9, 10]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [9, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 9, 10]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"HNF4A\",\n      \"PPARGC1A\",\n      \"NR2F2\",\n      \"HNF1A\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}