{"gene":"LIAS","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":2023,"finding":"FDX1 (ferredoxin 1) directly binds to LIAS (lipoyl synthase) and promotes LIAS functional binding to the lipoyl carrier protein GCSH, thereby regulating cellular protein lipoylation independently of indirect effects on Fe-S cluster biosynthesis.","method":"Co-immunoprecipitation, metabolite profiling, transcriptional profiling, loss-of-function studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — reciprocal binding demonstrated, mechanistic distinction from Fe-S indirect pathway established, multiple orthogonal methods, replicated across peer-reviewed paper and preprint","pmids":["37453661","36778498"],"is_preprint":false},{"year":2021,"finding":"Human LIAS is a radical SAM enzyme containing two [4Fe-4S] clusters (reducing and auxiliary); ISCA2 and ISCU (as [2Fe-2S]-bound forms) are primary Fe-S cluster donors to LIAS enabling complete catalytic turnover; EPR studies reveal that auxiliary cluster assembly precedes the reducing [4Fe-4S] center.","method":"In vitro reconstitution, LC-MS activity assay, EPR spectroscopy, site-directed mutagenesis of cluster-binding sites","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in vitro with multiple cluster donor proteins tested, EPR mechanistic validation, mutagenesis of individual cluster sites","pmids":["33562493"],"is_preprint":false},{"year":2013,"finding":"Loss-of-function mutations in LIAS cause deficient lipoylation of mitochondrial proteins (including reduced pyruvate dehydrogenase activity), deficient glycine cleavage enzyme activity, and nonketotic hyperglycinemia; transfection with wild-type LIAS corrects the biochemical deficiency, confirming LIAS as essential for mitochondrial protein lipoylation in human cells.","method":"Patient mutation identification, transfection rescue experiment, biochemical assays for lipoylation and enzyme activities","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function with defined biochemical readout plus functional rescue, multiple patients","pmids":["24334290"],"is_preprint":false},{"year":2021,"finding":"Overexpression of the Lias gene in mice increases endogenous lipoic acid synthase activity, reduces oxidative stress, improves mitochondrial function, and attenuates hepatic steatosis/NAFLD in Leprdb/db mice, demonstrating that LIAS-mediated lipoylation protects mitochondrial integrity.","method":"Transgenic mouse overexpression model, histopathology, mitochondrial function assays, oxidative stress measurements","journal":"The Journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 — defined in vivo phenotype with mechanistic link to lipoylation, single lab","pmids":["33263565"],"is_preprint":false},{"year":2023,"finding":"Novel compound heterozygous LIAS variants (p.Leu93Ter and p.Asp181Val) cause loss of LIAS function; yeast complementation assay (Saccharomyces cerevisiae lip5Δ) confirmed pathogenicity of the missense variant p.Asp181Val, establishing a yeast model for functional study of LIAS variants.","method":"Exome sequencing, yeast complementation assay (lip5Δ strain), oxidative growth rescue","journal":"Molecular genetics and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — functional rescue in orthologous yeast model with appropriate controls including known pathogenic variants","pmids":["36680912"],"is_preprint":false},{"year":2025,"finding":"PCSK9 directly interacts with LIAS (confirmed by protein docking and co-immunoprecipitation), and blocking PCSK9 with evolocumab inhibits LIAS-mediated cuproptosis in cardiomyocytes during ischemia-reperfusion injury.","method":"Co-immunoprecipitation, protein docking, mouse I/R model, echocardiography, histopathology","journal":"Basic research in cardiology","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP plus in vivo phenotype, single lab, no in vitro reconstitution of the interaction","pmids":["39930254"],"is_preprint":false},{"year":2025,"finding":"Iron overload during renal ischemia-reperfusion triggers Fe(II) accumulation that downregulates [4Fe-4S] cluster assembly proteins, causing loss of [4Fe-4S] clusters from LIAS, defective protein lipoylation, and cuproptosis in renal tubular cells; overexpression of [4Fe-4S] cluster assembly machinery or iron chelation restores LIAS function.","method":"Cell culture hypoxia-reoxygenation model, [4Fe-4S] cluster protein overexpression, iron chelation, lipoylation assays","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic pathway established with overexpression rescue and pharmacological intervention, single lab","pmids":["40753758"],"is_preprint":false}],"current_model":"LIAS (lipoyl synthase) is a mitochondrial radical SAM enzyme bearing two [4Fe-4S] clusters—supplied sequentially by ISCA2 and ISCU—that catalyzes the final step of lipoic acid biosynthesis, thereby lipoylating four key TCA-cycle/mitochondrial enzymes; its activity is directly promoted by FDX1 binding, which facilitates LIAS interaction with the lipoyl carrier GCSH, and can be disrupted by loss of [4Fe-4S] cluster integrity (e.g., via iron overload or pathogenic LIAS variants), leading to defective protein lipoylation, impaired mitochondrial respiration, and diseases including nonketotic hyperglycinemia and cuproptosis-associated injury."},"narrative":{"teleology":[{"year":2013,"claim":"Establishing that LIAS is essential for human mitochondrial protein lipoylation resolved whether lipoic acid in mammals is exclusively diet-derived or also synthesized endogenously, and linked LIAS deficiency to a defined Mendelian disease (nonketotic hyperglycinemia).","evidence":"Patient mutation identification with biochemical assays for lipoylation and pyruvate dehydrogenase/glycine cleavage activity, plus wild-type LIAS transfection rescue in patient cells","pmids":["24334290"],"confidence":"High","gaps":["Catalytic mechanism of human LIAS and identity of its iron–sulfur cluster donors were not yet determined","Whether LIAS dysfunction contributes to non-Mendelian disease contexts was unknown"]},{"year":2021,"claim":"In vitro reconstitution of human LIAS catalysis revealed it is a radical SAM enzyme requiring two [4Fe-4S] clusters assembled sequentially by ISCA2 (auxiliary cluster first) and ISCU (reducing cluster), defining the minimal cofactor requirements for catalytic turnover.","evidence":"Purified recombinant LIAS reconstituted with cluster donor proteins, activity monitored by LC-MS, cluster assembly tracked by EPR spectroscopy, mutagenesis of individual cluster-binding cysteines","pmids":["33562493"],"confidence":"High","gaps":["The electron donor coupling SAM cleavage to sulfur insertion in vivo was not identified","No structural model of human LIAS with both clusters bound"]},{"year":2021,"claim":"Demonstrating that Lias overexpression in a diabetic mouse model increases lipoic acid synthase activity, reduces oxidative stress, and attenuates hepatic steatosis established an in vivo link between LIAS-mediated lipoylation and mitochondrial protection beyond rare genetic disease.","evidence":"Transgenic Lias-overexpressing Leprdb/db mice assessed by histopathology, mitochondrial function assays, and oxidative stress markers","pmids":["33263565"],"confidence":"Medium","gaps":["Mechanism by which increased lipoylation reduces hepatic lipid accumulation was not dissected","Findings from a single laboratory and model system"]},{"year":2023,"claim":"Identification of FDX1 as a direct binding partner of LIAS that promotes the LIAS–GCSH interaction resolved how electron transfer is coupled to the lipoylation reaction and distinguished FDX1's role from its broader function in iron–sulfur cluster biogenesis.","evidence":"Co-immunoprecipitation of endogenous FDX1–LIAS complex, metabolite and transcriptional profiling, loss-of-function studies in mammalian cells","pmids":["37453661","36778498"],"confidence":"High","gaps":["Stoichiometry and structural basis of the FDX1–LIAS–GCSH ternary complex are unresolved","Whether other ferredoxins can substitute for FDX1 in vivo is untested"]},{"year":2023,"claim":"A yeast complementation system (lip5Δ) validated pathogenicity of novel LIAS missense variants, providing a scalable functional assay for clinical variant interpretation.","evidence":"Saccharomyces cerevisiae lip5Δ strain complemented with human LIAS wild-type and mutant alleles, growth rescue on oxidative medium","pmids":["36680912"],"confidence":"Medium","gaps":["Yeast assay may not capture all human-specific regulatory aspects of LIAS","Only a small number of variants tested so far"]},{"year":2025,"claim":"Demonstrating that iron overload disrupts [4Fe-4S] cluster integrity in LIAS, causing defective lipoylation and cuproptosis during ischemia-reperfusion, connected LIAS enzymology to a regulated cell death pathway and identified cluster integrity as a vulnerability node.","evidence":"Hypoxia-reoxygenation cell model with iron chelation and [4Fe-4S] cluster assembly protein overexpression rescuing lipoylation; mouse renal I/R model","pmids":["40753758"],"confidence":"Medium","gaps":["Single-lab finding; independent replication in other tissue-injury models needed","Whether cuproptosis is the dominant death mode downstream of LIAS inactivation vs. bioenergetic failure is unresolved"]},{"year":2025,"claim":"A reported direct PCSK9–LIAS interaction suggested a novel regulatory axis linking lipid metabolism signaling to cuproptosis in cardiomyocytes, but the mechanism by which PCSK9 modulates LIAS activity is unclear.","evidence":"Co-immunoprecipitation and protein docking, mouse cardiac I/R model with PCSK9 inhibitor evolocumab","pmids":["39930254"],"confidence":"Medium","gaps":["Single Co-IP without reciprocal pull-down or in vitro reconstitution of the direct interaction","Functional consequence of PCSK9 binding on LIAS catalytic activity not measured","No independent replication"]},{"year":null,"claim":"A structural model of human LIAS in complex with its [4Fe-4S] cluster donors, FDX1, and lipoyl carrier GCSH is lacking, leaving the spatial basis of substrate channeling and sulfur insertion unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of human LIAS","Kinetic mechanism of dual sulfur insertion from the auxiliary cluster not fully resolved with the human enzyme","Tissue-specific regulation of LIAS expression and activity is poorly characterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1,2,3]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2,3]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,6]}],"complexes":[],"partners":["FDX1","GCSH","ISCA2","ISCU","PCSK9"],"other_free_text":[]},"mechanistic_narrative":"LIAS (lipoyl synthase) is a mitochondrial radical SAM enzyme that catalyzes the terminal step of lipoic acid biosynthesis, inserting sulfur atoms into the octanoyl moiety attached to mitochondrial multienzyme complexes including pyruvate dehydrogenase and the glycine cleavage system. The enzyme harbors two [4Fe-4S] clusters—an auxiliary cluster that donates sulfur and a reducing cluster required for SAM cleavage—whose sequential assembly depends on the iron–sulfur cluster donors ISCA2 and ISCU [PMID:33562493]. FDX1 directly binds LIAS and promotes its functional interaction with the lipoyl carrier protein GCSH, coupling electron transfer to the lipoylation reaction [PMID:37453661]. Loss-of-function mutations in LIAS abolish protein lipoylation, impair mitochondrial energy metabolism, and cause nonketotic hyperglycinemia, as demonstrated by patient studies and rescue with wild-type LIAS [PMID:24334290]."},"prefetch_data":{"uniprot":{"accession":"O43766","full_name":"Lipoyl synthase, mitochondrial","aliases":["Lipoate synthase","LS","Lip-syn","Lipoic acid synthase"],"length_aa":372,"mass_kda":41.9,"function":"Catalyzes the radical-mediated insertion of two sulfur atoms into the C-6 and C-8 positions of the octanoyl moiety bound to the lipoyl domains of lipoate-dependent enzymes, thereby converting the octanoylated domains into lipoylated derivatives","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/O43766/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LIAS","classification":"Not Classified","n_dependent_lines":444,"n_total_lines":1208,"dependency_fraction":0.3675496688741722},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LIAS","total_profiled":1310},"omim":[{"mim_id":"616859","title":"SPASTICITY, CHILDHOOD-ONSET, WITH HYPERGLYCINEMIA; SPAHGC","url":"https://www.omim.org/entry/616859"},{"mim_id":"616370","title":"MULTIPLE MITOCHONDRIAL DYSFUNCTIONS SYNDROME 4; MMDS4","url":"https://www.omim.org/entry/616370"},{"mim_id":"615330","title":"MULTIPLE MITOCHONDRIAL DYSFUNCTIONS SYNDROME 3; MMDS3","url":"https://www.omim.org/entry/615330"},{"mim_id":"615317","title":"IRON-SULFUR CLUSTER ASSEMBLY 2; ISCA2","url":"https://www.omim.org/entry/615317"},{"mim_id":"615316","title":"IRON-SULFUR CLUSTER ASSEMBLY FACTOR IBA57; IBA57","url":"https://www.omim.org/entry/615316"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Mitochondria","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/LIAS"},"hgnc":{"alias_symbol":["LAS"],"prev_symbol":[]},"alphafold":{"accession":"O43766","domains":[{"cath_id":"3.20.20.70","chopping":"89-372","consensus_level":"medium","plddt":90.0638,"start":89,"end":372}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O43766","model_url":"https://alphafold.ebi.ac.uk/files/AF-O43766-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O43766-F1-predicted_aligned_error_v6.png","plddt_mean":81.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LIAS","jax_strain_url":"https://www.jax.org/strain/search?query=LIAS"},"sequence":{"accession":"O43766","fasta_url":"https://rest.uniprot.org/uniprotkb/O43766.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O43766/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O43766"}},"corpus_meta":[{"pmid":"9294432","id":"PMC_9294432","title":"Roles of Pseudomonas aeruginosa las and rhl quorum-sensing systems in control of elastase and rhamnolipid biosynthesis genes.","date":"1997","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/9294432","citation_count":765,"is_preprint":false},{"pmid":"9150205","id":"PMC_9150205","title":"Regulation of las and rhl quorum sensing in Pseudomonas aeruginosa.","date":"1997","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/9150205","citation_count":659,"is_preprint":false},{"pmid":"17449617","id":"PMC_17449617","title":"Environmental regulation of Pseudomonas aeruginosa PAO1 Las and Rhl quorum-sensing systems.","date":"2007","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/17449617","citation_count":185,"is_preprint":false},{"pmid":"24334290","id":"PMC_24334290","title":"Variant non ketotic hyperglycinemia is caused by mutations in LIAS, BOLA3 and the novel gene GLRX5.","date":"2013","source":"Brain : a journal of 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CYP720B1).","date":"2006","source":"Phytochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16497345","citation_count":56,"is_preprint":false},{"pmid":"11112115","id":"PMC_11112115","title":"Community-acquired bacterial pneumonia in human immunodeficiency virus-infected patients: validation of severity criteria. 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Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/18560152","citation_count":42,"is_preprint":false},{"pmid":"3202117","id":"PMC_3202117","title":"Expression of HIV in lymph node cells of LAS patients. Immunohistology, in situ hybridization, and identification of target cells.","date":"1988","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/3202117","citation_count":41,"is_preprint":false},{"pmid":"2863990","id":"PMC_2863990","title":"Arbovirus investigations in Argentina, 1977-1980. III. Identification and characterization of viruses isolated, including new subtypes of western and Venezuelan equine encephalitis viruses and four new bunyaviruses (Las Maloyas, Resistencia, Barranqueras, and Antequera).","date":"1985","source":"The American journal of tropical medicine and hygiene","url":"https://pubmed.ncbi.nlm.nih.gov/2863990","citation_count":41,"is_preprint":false},{"pmid":"30371625","id":"PMC_30371625","title":"The Las Vegas mass shooting: An analysis of blood component administration and blood bank donations.","date":"2019","source":"The journal of trauma and acute care surgery","url":"https://pubmed.ncbi.nlm.nih.gov/30371625","citation_count":38,"is_preprint":false},{"pmid":"15292190","id":"PMC_15292190","title":"Peptidoglycan amidase MepA is a LAS metallopeptidase.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15292190","citation_count":35,"is_preprint":false},{"pmid":"11751385","id":"PMC_11751385","title":"LAS, a novel selective estrogen receptor modulator with chemopreventive and therapeutic activity in the N-nitroso-N-methylurea-induced rat mammary tumor model.","date":"2001","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/11751385","citation_count":33,"is_preprint":false},{"pmid":"36758698","id":"PMC_36758698","title":"Identification and genome sequencing of an influenza H3N2 variant in wastewater from elementary schools during a surge of influenza A cases in Las Vegas, Nevada.","date":"2023","source":"The Science of the total environment","url":"https://pubmed.ncbi.nlm.nih.gov/36758698","citation_count":32,"is_preprint":false},{"pmid":"18458070","id":"PMC_18458070","title":"LiaS regulates virulence factor expression in Streptococcus mutans.","date":"2008","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/18458070","citation_count":31,"is_preprint":false},{"pmid":"20189800","id":"PMC_20189800","title":"Anaerobic degradation of linear alkylbenzene sulfonate (LAS) in fluidized bed reactor by microbial consortia in different support materials.","date":"2010","source":"Bioresource technology","url":"https://pubmed.ncbi.nlm.nih.gov/20189800","citation_count":31,"is_preprint":false},{"pmid":"15853813","id":"PMC_15853813","title":"Control analysis as a tool to understand the formation of the las operon in Lactococcus lactis.","date":"2005","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/15853813","citation_count":30,"is_preprint":false},{"pmid":"17030516","id":"PMC_17030516","title":"Expression of the las and rhl quorum-sensing systems in clinical isolates of Pseudomonas aeruginosa does not correlate with efflux pump expression or antimicrobial resistance.","date":"2006","source":"The Journal of antimicrobial chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/17030516","citation_count":29,"is_preprint":false},{"pmid":"31533077","id":"PMC_31533077","title":"Musa acuminata and its bioactive metabolite 5-Hydroxymethylfurfural mitigates quorum sensing (las and rhl) mediated biofilm and virulence production of nosocomial pathogen Pseudomonas aeruginosa in vitro.","date":"2019","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/31533077","citation_count":29,"is_preprint":false},{"pmid":"3913634","id":"PMC_3913634","title":"Systemic lymphadenopathy (LAS) in intravenous drug abusers. 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Grupo Andaluz para el Estudio de las Enfermedades Infecciosas.","date":"1996","source":"European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/8922569","citation_count":25,"is_preprint":false},{"pmid":"10722428","id":"PMC_10722428","title":"Haemophilus influenzae pneumonia in human immunodeficiency virus-infected patients. 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  \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding demonstrated, mechanistic distinction from Fe-S indirect pathway established, multiple orthogonal methods, replicated across peer-reviewed paper and preprint\",\n      \"pmids\": [\"37453661\", \"36778498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Human LIAS is a radical SAM enzyme containing two [4Fe-4S] clusters (reducing and auxiliary); ISCA2 and ISCU (as [2Fe-2S]-bound forms) are primary Fe-S cluster donors to LIAS enabling complete catalytic turnover; EPR studies reveal that auxiliary cluster assembly precedes the reducing [4Fe-4S] center.\",\n      \"method\": \"In vitro reconstitution, LC-MS activity assay, EPR spectroscopy, site-directed mutagenesis of cluster-binding sites\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in vitro with multiple cluster donor proteins tested, EPR mechanistic validation, mutagenesis of individual cluster sites\",\n      \"pmids\": [\"33562493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss-of-function mutations in LIAS cause deficient lipoylation of mitochondrial proteins (including reduced pyruvate dehydrogenase activity), deficient glycine cleavage enzyme activity, and nonketotic hyperglycinemia; transfection with wild-type LIAS corrects the biochemical deficiency, confirming LIAS as essential for mitochondrial protein lipoylation in human cells.\",\n      \"method\": \"Patient mutation identification, transfection rescue experiment, biochemical assays for lipoylation and enzyme activities\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined biochemical readout plus functional rescue, multiple patients\",\n      \"pmids\": [\"24334290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Overexpression of the Lias gene in mice increases endogenous lipoic acid synthase activity, reduces oxidative stress, improves mitochondrial function, and attenuates hepatic steatosis/NAFLD in Leprdb/db mice, demonstrating that LIAS-mediated lipoylation protects mitochondrial integrity.\",\n      \"method\": \"Transgenic mouse overexpression model, histopathology, mitochondrial function assays, oxidative stress measurements\",\n      \"journal\": \"The Journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined in vivo phenotype with mechanistic link to lipoylation, single lab\",\n      \"pmids\": [\"33263565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Novel compound heterozygous LIAS variants (p.Leu93Ter and p.Asp181Val) cause loss of LIAS function; yeast complementation assay (Saccharomyces cerevisiae lip5Δ) confirmed pathogenicity of the missense variant p.Asp181Val, establishing a yeast model for functional study of LIAS variants.\",\n      \"method\": \"Exome sequencing, yeast complementation assay (lip5Δ strain), oxidative growth rescue\",\n      \"journal\": \"Molecular genetics and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional rescue in orthologous yeast model with appropriate controls including known pathogenic variants\",\n      \"pmids\": [\"36680912\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCSK9 directly interacts with LIAS (confirmed by protein docking and co-immunoprecipitation), and blocking PCSK9 with evolocumab inhibits LIAS-mediated cuproptosis in cardiomyocytes during ischemia-reperfusion injury.\",\n      \"method\": \"Co-immunoprecipitation, protein docking, mouse I/R model, echocardiography, histopathology\",\n      \"journal\": \"Basic research in cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP plus in vivo phenotype, single lab, no in vitro reconstitution of the interaction\",\n      \"pmids\": [\"39930254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Iron overload during renal ischemia-reperfusion triggers Fe(II) accumulation that downregulates [4Fe-4S] cluster assembly proteins, causing loss of [4Fe-4S] clusters from LIAS, defective protein lipoylation, and cuproptosis in renal tubular cells; overexpression of [4Fe-4S] cluster assembly machinery or iron chelation restores LIAS function.\",\n      \"method\": \"Cell culture hypoxia-reoxygenation model, [4Fe-4S] cluster protein overexpression, iron chelation, lipoylation assays\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic pathway established with overexpression rescue and pharmacological intervention, single lab\",\n      \"pmids\": [\"40753758\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LIAS (lipoyl synthase) is a mitochondrial radical SAM enzyme bearing two [4Fe-4S] clusters—supplied sequentially by ISCA2 and ISCU—that catalyzes the final step of lipoic acid biosynthesis, thereby lipoylating four key TCA-cycle/mitochondrial enzymes; its activity is directly promoted by FDX1 binding, which facilitates LIAS interaction with the lipoyl carrier GCSH, and can be disrupted by loss of [4Fe-4S] cluster integrity (e.g., via iron overload or pathogenic LIAS variants), leading to defective protein lipoylation, impaired mitochondrial respiration, and diseases including nonketotic hyperglycinemia and cuproptosis-associated injury.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"LIAS (lipoyl synthase) is a mitochondrial radical SAM enzyme that catalyzes the terminal step of lipoic acid biosynthesis, inserting sulfur atoms into the octanoyl moiety attached to mitochondrial multienzyme complexes including pyruvate dehydrogenase and the glycine cleavage system. The enzyme harbors two [4Fe-4S] clusters—an auxiliary cluster that donates sulfur and a reducing cluster required for SAM cleavage—whose sequential assembly depends on the iron–sulfur cluster donors ISCA2 and ISCU [PMID:33562493]. FDX1 directly binds LIAS and promotes its functional interaction with the lipoyl carrier protein GCSH, coupling electron transfer to the lipoylation reaction [PMID:37453661]. Loss-of-function mutations in LIAS abolish protein lipoylation, impair mitochondrial energy metabolism, and cause nonketotic hyperglycinemia, as demonstrated by patient studies and rescue with wild-type LIAS [PMID:24334290].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing that LIAS is essential for human mitochondrial protein lipoylation resolved whether lipoic acid in mammals is exclusively diet-derived or also synthesized endogenously, and linked LIAS deficiency to a defined Mendelian disease (nonketotic hyperglycinemia).\",\n      \"evidence\": \"Patient mutation identification with biochemical assays for lipoylation and pyruvate dehydrogenase/glycine cleavage activity, plus wild-type LIAS transfection rescue in patient cells\",\n      \"pmids\": [\"24334290\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Catalytic mechanism of human LIAS and identity of its iron–sulfur cluster donors were not yet determined\",\n        \"Whether LIAS dysfunction contributes to non-Mendelian disease contexts was unknown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In vitro reconstitution of human LIAS catalysis revealed it is a radical SAM enzyme requiring two [4Fe-4S] clusters assembled sequentially by ISCA2 (auxiliary cluster first) and ISCU (reducing cluster), defining the minimal cofactor requirements for catalytic turnover.\",\n      \"evidence\": \"Purified recombinant LIAS reconstituted with cluster donor proteins, activity monitored by LC-MS, cluster assembly tracked by EPR spectroscopy, mutagenesis of individual cluster-binding cysteines\",\n      \"pmids\": [\"33562493\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The electron donor coupling SAM cleavage to sulfur insertion in vivo was not identified\",\n        \"No structural model of human LIAS with both clusters bound\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that Lias overexpression in a diabetic mouse model increases lipoic acid synthase activity, reduces oxidative stress, and attenuates hepatic steatosis established an in vivo link between LIAS-mediated lipoylation and mitochondrial protection beyond rare genetic disease.\",\n      \"evidence\": \"Transgenic Lias-overexpressing Leprdb/db mice assessed by histopathology, mitochondrial function assays, and oxidative stress markers\",\n      \"pmids\": [\"33263565\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism by which increased lipoylation reduces hepatic lipid accumulation was not dissected\",\n        \"Findings from a single laboratory and model system\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identification of FDX1 as a direct binding partner of LIAS that promotes the LIAS–GCSH interaction resolved how electron transfer is coupled to the lipoylation reaction and distinguished FDX1's role from its broader function in iron–sulfur cluster biogenesis.\",\n      \"evidence\": \"Co-immunoprecipitation of endogenous FDX1–LIAS complex, metabolite and transcriptional profiling, loss-of-function studies in mammalian cells\",\n      \"pmids\": [\"37453661\", \"36778498\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Stoichiometry and structural basis of the FDX1–LIAS–GCSH ternary complex are unresolved\",\n        \"Whether other ferredoxins can substitute for FDX1 in vivo is untested\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A yeast complementation system (lip5Δ) validated pathogenicity of novel LIAS missense variants, providing a scalable functional assay for clinical variant interpretation.\",\n      \"evidence\": \"Saccharomyces cerevisiae lip5Δ strain complemented with human LIAS wild-type and mutant alleles, growth rescue on oxidative medium\",\n      \"pmids\": [\"36680912\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Yeast assay may not capture all human-specific regulatory aspects of LIAS\",\n        \"Only a small number of variants tested so far\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrating that iron overload disrupts [4Fe-4S] cluster integrity in LIAS, causing defective lipoylation and cuproptosis during ischemia-reperfusion, connected LIAS enzymology to a regulated cell death pathway and identified cluster integrity as a vulnerability node.\",\n      \"evidence\": \"Hypoxia-reoxygenation cell model with iron chelation and [4Fe-4S] cluster assembly protein overexpression rescuing lipoylation; mouse renal I/R model\",\n      \"pmids\": [\"40753758\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab finding; independent replication in other tissue-injury models needed\",\n        \"Whether cuproptosis is the dominant death mode downstream of LIAS inactivation vs. bioenergetic failure is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A reported direct PCSK9–LIAS interaction suggested a novel regulatory axis linking lipid metabolism signaling to cuproptosis in cardiomyocytes, but the mechanism by which PCSK9 modulates LIAS activity is unclear.\",\n      \"evidence\": \"Co-immunoprecipitation and protein docking, mouse cardiac I/R model with PCSK9 inhibitor evolocumab\",\n      \"pmids\": [\"39930254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single Co-IP without reciprocal pull-down or in vitro reconstitution of the direct interaction\",\n        \"Functional consequence of PCSK9 binding on LIAS catalytic activity not measured\",\n        \"No independent replication\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A structural model of human LIAS in complex with its [4Fe-4S] cluster donors, FDX1, and lipoyl carrier GCSH is lacking, leaving the spatial basis of substrate channeling and sulfur insertion unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of human LIAS\",\n        \"Kinetic mechanism of dual sulfur insertion from the auxiliary cluster not fully resolved with the human enzyme\",\n        \"Tissue-specific regulation of LIAS expression and activity is poorly characterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 2, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"FDX1\",\n      \"GCSH\",\n      \"ISCA2\",\n      \"ISCU\",\n      \"PCSK9\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}