{"gene":"COASY","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2019,"finding":"COASY protein directly interacts with the PI3K regulatory subunit PI3K-P85α, leading to increased AKT and mTOR phosphorylation and enhanced cell survival; shRNA knockdown of COASY disrupted downstream PI3K pathway activation and hindered DNA double-strand break repair, both contributing to radiosensitivity.","method":"Co-immunoprecipitation (COASY-PI3K-P85α interaction), shRNA knockdown with measurement of AKT/mTOR phosphorylation, xenograft in vivo assays, DNA damage repair assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP reported for interaction, functional KD with multiple cellular readouts (phosphorylation, DNA repair, in vivo tumor growth), single lab","pmids":["31704889"],"is_preprint":false},{"year":2016,"finding":"Zebrafish coasy knockdown causes strong reduction of CoA content; abrogation of coasy expression leads to dorsalized phenotype with decreased BMP receptor expression and BMP pathway activity, perturbed dorso-ventral patterning, impaired neurogenesis, and vascular defects. These phenotypes were rescued by exogenous CoA addition or overexpression of wild-type human COASY but not mutant COASY, establishing that the phenotype is specifically due to loss of CoA biosynthesis.","method":"Morpholino knockdown in zebrafish, CoA quantification, BMP pathway activity assays, rescue experiments with exogenous CoA and human wild-type vs. mutant COASY overexpression","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (morpholino KD, biochemical CoA quantification, pathway activity assay, genetic rescue with WT vs. mutant), rigorous controls including mutant COASY failing rescue","pmids":["27892483"],"is_preprint":false},{"year":2018,"finding":"Biallelic loss-of-function variants in COASY (compound heterozygous or homozygous c.1486-3C>G splice variant) result in near-complete absence of CoA synthase protein and virtually absent CoA synthase enzymatic activity in patient cells, causing a lethal pontocerebellar hypoplasia phenotype. The splice variant leads to exon 7 skipping with partial intron 7 retention, frameshifting and premature stop codon.","method":"Whole-exome sequencing, RNA analysis (splice effect), immunoblot (protein absence), CoA synthase enzymatic activity assay in patient fibroblasts","journal":"European journal of human genetics : EJHG","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic activity measurement in patient cells combined with protein immunoblot and RNA splice analysis, replicated in two families","pmids":["30089828"],"is_preprint":false},{"year":2025,"finding":"Reduction of CoASY in Drosophila muscle and brain leads to degenerative phenotypes and apoptosis accompanied by impaired mitochondrial integrity, augmented release of mitochondrial DNA, and diminished assembly and activity of mitochondrial electron transport chain complexes I and III, resulting in decreased ATP generation.","method":"Drosophila genetic knockdown model, mitochondrial integrity assays, mtDNA quantification, ETC complex assembly/activity assays, ATP measurement","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical readouts (ETC complex activity, ATP, mtDNA release) in a Drosophila model, single lab","pmids":["39985665"],"is_preprint":false},{"year":2024,"finding":"Patient fibroblasts with pathogenic COASY variants show impaired mitochondrial oxygen consumption; despite comparable total CoA levels to control cells, the amounts of mitochondrial 4'-phosphopantetheinylated proteins are significantly reduced in COASY patients, suggesting that COASY function is particularly critical for mitochondrial protein modification rather than bulk CoA levels.","method":"Bioenergetic analysis (mitochondrial oxygen consumption), quantification of 4'-phosphopantetheinylated proteins, RNA sequencing of patient fibroblasts","journal":"Annals of clinical and translational neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical measurements in patient-derived fibroblasts with two orthogonal methods (respirometry and phosphopantetheinylation quantification), single lab","pmids":["38750253"],"is_preprint":false},{"year":2026,"finding":"Conditional, inducible neuron-specific deletion of Coasy in mice recapitulates key CoPAN features including motor deficits, neurodegeneration, iron dyshomeostasis, reduced survival, and extensive neuroinflammation. Treatment with leriglitazone (PPARγ agonist) improved motor performance, restored iron homeostasis, and attenuated neuroinflammation and neurodegeneration, establishing neuroinflammation as a pathogenic component downstream of CoA deficiency.","method":"Conditional neuron-specific Coasy knockout mouse model (inducible), behavioral assays, histopathology, iron quantification, pharmacological intervention with leriglitazone","journal":"Pharmacological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with multiple defined phenotypic readouts and pharmacological rescue, single lab","pmids":["41985770"],"is_preprint":false},{"year":2020,"finding":"Robust CoAsy knockdown (>99%) in TNBC cell lines (HCC1806, MDA-MB-231) reduced CoA levels to approximately half normal but had no detectable effect on cell proliferation or migration in vitro, suggesting cells can maintain adequate CoA through compensatory mechanisms.","method":"Stable inducible shRNA knockdown, CoA level measurement in cell lysates, cell proliferation and migration assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — robust knockdown confirmed, direct CoA quantification, negative result for proliferation/migration across multiple shRNA constructs and cell lines","pmids":["32828275"],"is_preprint":false},{"year":2025,"finding":"CoAsy loss in TNBC cells stabilizes HIF-1α and HIF-2α independently of the canonical oxygen-sensing pathway. Proximity-labelling proteomics revealed that CoAsy deficiency disrupts the association between HIF-1α and the proteasome through UBFD1, a CoA-binding protein that scaffolds HIFα for degradation. UBFD1's CoA-dependent interaction with HIFα is mediated by its PH domain, which undergoes CoAlation (a CoA-based post-translational modification). Restoring CoAsy expression in vivo suppresses lung metastasis.","method":"Proximity-labelling proteomics (BioID), HIF-α stability assays under normoxia, CoAsy knockdown/overexpression, in vivo tumor metastasis assay, identification of UBFD1 CoAlation","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity-labelling proteomics with functional validation (HIF stabilization, in vivo metastasis), preprint not yet peer-reviewed, single lab","pmids":["bio_10.1101_2025.06.18.660436"],"is_preprint":true},{"year":2025,"finding":"Antisense oligonucleotide (ASO) knockdown of COASY in mice reduced cholesterol content in liver lipid droplets and prevented CDAHFD diet-induced metabolic dysfunction-associated steatohepatitis (MASH) and the fibrotic response; these effects were abrogated by dietary cholesterol supplementation, placing COASY upstream of lipid droplet cholesterol accumulation in hepatic lipid metabolism.","method":"ASO-mediated Coasy knockdown in mice, liver lipid droplet cholesterol quantification, histopathological assessment of steatohepatitis and fibrosis, dietary cholesterol supplementation rescue","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genetic knockdown with biochemical quantification and dietary rescue in mouse model, preprint not yet peer-reviewed, single lab","pmids":["bio_10.1101_2025.02.25.640203"],"is_preprint":true}],"current_model":"COASY encodes a bifunctional CoA synthase that catalyzes the final two steps of de novo CoA biosynthesis; it is essential for mitochondrial integrity and electron transport chain function (complexes I and III), regulates PI3K-AKT-mTOR signaling through direct interaction with PI3K-P85α, controls HIF-1α/2α stability via the CoA-binding scaffold protein UBFD1 and CoAlation, modulates BMP pathway activity during neural/vascular development, and influences liver lipid droplet cholesterol homeostasis, with loss-of-function causing neurodegeneration (CoPAN/PCH12) characterized by CoA deficiency, mitochondrial dysfunction, neuroinflammation, and iron dyshomeostasis."},"narrative":{"mechanistic_narrative":"COASY encodes the bifunctional CoA synthase that catalyzes the terminal steps of de novo coenzyme A biosynthesis, an activity essential for normal development, mitochondrial function, and signaling across multiple tissues [PMID:27892483, PMID:30089828]. Its enzymatic role is established directly in patient fibroblasts, where biallelic loss-of-function variants abolish CoA synthase protein and activity and cause a lethal pontocerebellar hypoplasia phenotype [PMID:30089828]; in zebrafish, loss of coasy depletes CoA and dorsalizes the embryo through reduced BMP receptor expression and BMP pathway activity, with rescue by exogenous CoA or wild-type but not mutant human COASY demonstrating that the developmental phenotypes are specifically attributable to CoA biosynthesis [PMID:27892483]. COASY deficiency compromises mitochondrial integrity: loss diminishes assembly and activity of electron transport chain complexes I and III, lowers ATP production, and promotes mitochondrial DNA release and apoptosis [PMID:39985665], and patient cells show impaired respiration with selectively reduced mitochondrial 4'-phosphopantetheinylated proteins despite preserved bulk CoA, indicating that COASY function is particularly critical for mitochondrial protein modification [PMID:38750253]. In the nervous system, neuron-specific Coasy deletion in mice recapitulates CoPAN features including neurodegeneration, iron dyshomeostasis, and neuroinflammation, the last of which is a pathogenic component downstream of CoA deficiency and is attenuated by the PPARγ agonist leriglitazone [PMID:41985770]. Beyond its canonical biosynthetic role, COASY directly binds the PI3K regulatory subunit PI3K-P85α to promote AKT/mTOR phosphorylation, cell survival, and DNA double-strand break repair [PMID:31704889], and influences hepatic lipid droplet cholesterol homeostasis upstream of diet-induced steatohepatitis [PMID:bio_10.1101_2025.02.25.640203].","teleology":[{"year":2016,"claim":"Established that COASY's developmental role operates through CoA biosynthesis rather than a CoA-independent function, by showing that loss-of-function phenotypes track with CoA depletion and require enzymatically functional protein for rescue.","evidence":"Morpholino knockdown in zebrafish with CoA quantification, BMP pathway activity assays, and rescue with exogenous CoA and WT vs. mutant human COASY","pmids":["27892483"],"confidence":"High","gaps":["Does not define how CoA depletion mechanistically reduces BMP receptor expression","Mammalian developmental requirement not addressed here"]},{"year":2018,"claim":"Linked COASY loss-of-function directly to human disease by demonstrating that biallelic variants abolish CoA synthase enzymatic activity and protein in patient cells, causing lethal pontocerebellar hypoplasia.","evidence":"Whole-exome sequencing, RNA splice analysis, immunoblot, and CoA synthase activity assays in patient fibroblasts from two families","pmids":["30089828"],"confidence":"High","gaps":["Does not resolve which downstream CoA-dependent processes drive the neurodevelopmental phenotype","Tissue selectivity of the phenotype unexplained"]},{"year":2019,"claim":"Identified a non-canonical role beyond CoA biosynthesis, showing COASY physically engages PI3K-P85α to drive AKT/mTOR signaling, survival, and DNA repair, and thereby modulates radiosensitivity.","evidence":"Reciprocal Co-IP, shRNA knockdown with AKT/mTOR phosphorylation and DNA repair readouts, and xenograft assays","pmids":["31704889"],"confidence":"Medium","gaps":["Whether the PI3K interaction depends on CoA synthase catalytic activity is unresolved","Structural basis of COASY-P85α binding unknown"]},{"year":2020,"claim":"Tested whether CoA biosynthesis is rate-limiting for cancer cell behavior, finding that robust COASY knockdown halves CoA but does not impair TNBC proliferation or migration, implying compensatory CoA maintenance.","evidence":"Stable inducible shRNA knockdown with CoA quantification and proliferation/migration assays across multiple constructs and cell lines","pmids":["32828275"],"confidence":"Medium","gaps":["Compensatory mechanisms maintaining CoA not identified","Does not assess in vivo or metabolic stress conditions"]},{"year":2024,"claim":"Refined the disease mechanism by showing COASY is critical for mitochondrial protein 4'-phosphopantetheinylation and respiration even when bulk CoA appears normal, shifting emphasis from total CoA pools to a specific mitochondrial modification.","evidence":"Respirometry, quantification of 4'-phosphopantetheinylated proteins, and RNA-seq in patient fibroblasts","pmids":["38750253"],"confidence":"Medium","gaps":["The identity of the affected phosphopantetheinylated mitochondrial proteins is not defined","Mechanistic link from reduced modification to respiratory defect not established"]},{"year":2025,"claim":"Defined the mitochondrial degeneration mechanism, showing COASY loss impairs ETC complex I and III assembly/activity, lowers ATP, and triggers mtDNA release and apoptosis.","evidence":"Drosophila muscle and brain knockdown with mitochondrial integrity, ETC complex, ATP, and mtDNA assays","pmids":["39985665"],"confidence":"Medium","gaps":["Does not establish whether complex defects are direct consequences of impaired phosphopantetheinylation","mtDNA release trigger not mechanistically dissected"]},{"year":2025,"claim":"Proposed a CoA-dependent signaling axis in which COASY controls HIF-1α/2α stability via CoAlation of the UBFD1 PH domain, scaffolding HIFα for proteasomal degradation independently of oxygen sensing.","evidence":"Proximity-labelling proteomics (BioID), HIFα stability assays under normoxia, knockdown/overexpression, and in vivo metastasis assay (preprint)","pmids":["bio_10.1101_2025.06.18.660436"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed and from a single lab","Direct demonstration that UBFD1 CoAlation is required in vivo is incomplete","Generality beyond TNBC unknown"]},{"year":2025,"claim":"Extended COASY's physiological reach to hepatic lipid metabolism, placing it upstream of lipid droplet cholesterol accumulation and diet-induced steatohepatitis.","evidence":"ASO-mediated Coasy knockdown in mice with lipid droplet cholesterol quantification, steatohepatitis/fibrosis histopathology, and dietary cholesterol rescue (preprint)","pmids":["bio_10.1101_2025.02.25.640203"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed and from a single lab","Molecular link between CoA biosynthesis and lipid droplet cholesterol not defined"]},{"year":2026,"claim":"Identified neuroinflammation as a tractable pathogenic component of CoA-deficiency neurodegeneration and a candidate therapeutic node.","evidence":"Inducible neuron-specific Coasy knockout mice with behavioral, histopathological, and iron readouts plus leriglitazone (PPARγ agonist) intervention","pmids":["41985770"],"confidence":"Medium","gaps":["Mechanism linking CoA loss to iron dyshomeostasis not resolved","Whether leriglitazone acts on neurons or glia is unclear"]},{"year":null,"claim":"It remains unresolved how COASY's catalytic CoA-synthesizing function is mechanistically coupled to its signaling roles (PI3K-AKT-mTOR, HIFα/UBFD1) and to tissue-selective phenotypes, and whether these depend on CoA, CoAlation, or CoA-independent protein interactions.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating catalytic and scaffolding activities","CoAlation substrate repertoire incompletely mapped","Basis of tissue selectivity (neuron vs. liver vs. tumor) unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[2]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,4]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,7]}],"complexes":[],"partners":["PIK3R1","UBFD1","HIF1A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13057","full_name":"Bifunctional coenzyme A synthase","aliases":["NBP","POV-2"],"length_aa":564,"mass_kda":62.3,"function":"Bifunctional enzyme that catalyzes the fourth step of the coenzyme A biosynthetic pathway, the adenylation of 4'-phosphopantetheine, and the fifth step, the phosphorylation of dephospho-CoA to CoA","subcellular_location":"Cytoplasm, cytosol; Mitochondrion matrix","url":"https://www.uniprot.org/uniprotkb/Q13057/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/COASY","classification":"Common Essential","n_dependent_lines":821,"n_total_lines":1208,"dependency_fraction":0.679635761589404},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/COASY","total_profiled":1310},"omim":[{"mim_id":"618266","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 12; PCH12","url":"https://www.omim.org/entry/618266"},{"mim_id":"615643","title":"NEURODEGENERATION WITH BRAIN IRON ACCUMULATION 6; NBIA6","url":"https://www.omim.org/entry/615643"},{"mim_id":"609855","title":"COENZYME A SYNTHASE; COASY","url":"https://www.omim.org/entry/609855"},{"mim_id":"609854","title":"PHOSPHOPANTOTHENOYLCYSTEINE DECARBOXYLASE; PPCDC","url":"https://www.omim.org/entry/609854"},{"mim_id":"609853","title":"PHOSPHOPANTOTHENOYLCYSTEINE SYNTHETASE; PPCS","url":"https://www.omim.org/entry/609853"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Connecting piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/COASY"},"hgnc":{"alias_symbol":["DPCK","NBP","PPAT"],"prev_symbol":[]},"alphafold":{"accession":"Q13057","domains":[{"cath_id":"3.40.50,3.40.50","chopping":"5-152","consensus_level":"high","plddt":88.7983,"start":5,"end":152},{"cath_id":"3.40.50.620","chopping":"191-316","consensus_level":"high","plddt":94.7975,"start":191,"end":316},{"cath_id":"3.40.50.300","chopping":"342-384_465-564","consensus_level":"medium","plddt":93.2151,"start":342,"end":564},{"cath_id":"-","chopping":"390-445","consensus_level":"medium","plddt":93.9318,"start":390,"end":445}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13057","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q13057-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q13057-F1-predicted_aligned_error_v6.png","plddt_mean":89.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=COASY","jax_strain_url":"https://www.jax.org/strain/search?query=COASY"},"sequence":{"accession":"Q13057","fasta_url":"https://rest.uniprot.org/uniprotkb/Q13057.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q13057/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q13057"}},"corpus_meta":[{"pmid":"31704889","id":"PMC_31704889","title":"CoA Synthase (COASY) Mediates Radiation Resistance via PI3K Signaling in Rectal Cancer.","date":"2019","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/31704889","citation_count":43,"is_preprint":false},{"pmid":"30089828","id":"PMC_30089828","title":"Biallelic loss of function variants in COASY cause prenatal onset pontocerebellar hypoplasia, microcephaly, and arthrogryposis.","date":"2018","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/30089828","citation_count":38,"is_preprint":false},{"pmid":"27892483","id":"PMC_27892483","title":"Down-regulation of coasy, the gene associated with NBIA-VI, reduces Bmp signaling, perturbs dorso-ventral patterning and alters neuronal development in zebrafish.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27892483","citation_count":37,"is_preprint":false},{"pmid":"27992572","id":"PMC_27992572","title":"Usefulness of DNA Methylation Levels in COASY and SPINT1 Gene Promoter Regions as Biomarkers in Diagnosis of Alzheimer's Disease and Amnestic Mild Cognitive Impairment.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/27992572","citation_count":25,"is_preprint":false},{"pmid":"32699290","id":"PMC_32699290","title":"Increased blood COASY DNA methylation levels a potential biomarker for early pathology of Alzheimer's disease.","date":"2020","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/32699290","citation_count":24,"is_preprint":false},{"pmid":"36495139","id":"PMC_36495139","title":"Progressive brain atrophy and severe neurodevelopmental phenotype in siblings with biallelic COASY variants.","date":"2022","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/36495139","citation_count":9,"is_preprint":false},{"pmid":"35499143","id":"PMC_35499143","title":"COASY related pontocerebellar hypoplasia type 12: A common Indian mutation with expansion of the phenotypic spectrum.","date":"2022","source":"American journal of medical genetics. 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Metabolites Targeting P. falciparum DHODH and DPCK for Antimalarial Discovery.","date":"2025","source":"Biologics : targets & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/41277945","citation_count":0,"is_preprint":false},{"pmid":"42029543","id":"PMC_42029543","title":"COASY-Associated Disorders as a Differential Diagnosis in Cases with Newborn Screening Results Suggestive of CPT-I.","date":"2026","source":"International journal of neonatal screening","url":"https://pubmed.ncbi.nlm.nih.gov/42029543","citation_count":0,"is_preprint":false},{"pmid":"41985770","id":"PMC_41985770","title":"PPARγ activation by leriglitazone counteracts neurodegeneration and neuroinflammation in a disease-relevant mouse model of COASY dysfunction.","date":"2026","source":"Pharmacological research","url":"https://pubmed.ncbi.nlm.nih.gov/41985770","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.06.18.660436","title":"Coenzyme A homeostasis regulates hypoxic signalling via UBFD1 in triple-negative breast cancer","date":"2025-06-22","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.18.660436","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.02.25.640203","title":"Liver lipid droplet cholesterol content is a key determinant of metabolic dysfunction-associated steatohepatitis","date":"2025-03-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.25.640203","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11340,"output_tokens":2538,"usd":0.036045,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9936,"output_tokens":3472,"usd":0.06824,"stage2_stop_reason":"end_turn"},"total_usd":0.104285,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2019,\n      \"finding\": \"COASY protein directly interacts with the PI3K regulatory subunit PI3K-P85α, leading to increased AKT and mTOR phosphorylation and enhanced cell survival; shRNA knockdown of COASY disrupted downstream PI3K pathway activation and hindered DNA double-strand break repair, both contributing to radiosensitivity.\",\n      \"method\": \"Co-immunoprecipitation (COASY-PI3K-P85α interaction), shRNA knockdown with measurement of AKT/mTOR phosphorylation, xenograft in vivo assays, DNA damage repair assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP reported for interaction, functional KD with multiple cellular readouts (phosphorylation, DNA repair, in vivo tumor growth), single lab\",\n      \"pmids\": [\"31704889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Zebrafish coasy knockdown causes strong reduction of CoA content; abrogation of coasy expression leads to dorsalized phenotype with decreased BMP receptor expression and BMP pathway activity, perturbed dorso-ventral patterning, impaired neurogenesis, and vascular defects. These phenotypes were rescued by exogenous CoA addition or overexpression of wild-type human COASY but not mutant COASY, establishing that the phenotype is specifically due to loss of CoA biosynthesis.\",\n      \"method\": \"Morpholino knockdown in zebrafish, CoA quantification, BMP pathway activity assays, rescue experiments with exogenous CoA and human wild-type vs. mutant COASY overexpression\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (morpholino KD, biochemical CoA quantification, pathway activity assay, genetic rescue with WT vs. mutant), rigorous controls including mutant COASY failing rescue\",\n      \"pmids\": [\"27892483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Biallelic loss-of-function variants in COASY (compound heterozygous or homozygous c.1486-3C>G splice variant) result in near-complete absence of CoA synthase protein and virtually absent CoA synthase enzymatic activity in patient cells, causing a lethal pontocerebellar hypoplasia phenotype. The splice variant leads to exon 7 skipping with partial intron 7 retention, frameshifting and premature stop codon.\",\n      \"method\": \"Whole-exome sequencing, RNA analysis (splice effect), immunoblot (protein absence), CoA synthase enzymatic activity assay in patient fibroblasts\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic activity measurement in patient cells combined with protein immunoblot and RNA splice analysis, replicated in two families\",\n      \"pmids\": [\"30089828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Reduction of CoASY in Drosophila muscle and brain leads to degenerative phenotypes and apoptosis accompanied by impaired mitochondrial integrity, augmented release of mitochondrial DNA, and diminished assembly and activity of mitochondrial electron transport chain complexes I and III, resulting in decreased ATP generation.\",\n      \"method\": \"Drosophila genetic knockdown model, mitochondrial integrity assays, mtDNA quantification, ETC complex assembly/activity assays, ATP measurement\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical readouts (ETC complex activity, ATP, mtDNA release) in a Drosophila model, single lab\",\n      \"pmids\": [\"39985665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Patient fibroblasts with pathogenic COASY variants show impaired mitochondrial oxygen consumption; despite comparable total CoA levels to control cells, the amounts of mitochondrial 4'-phosphopantetheinylated proteins are significantly reduced in COASY patients, suggesting that COASY function is particularly critical for mitochondrial protein modification rather than bulk CoA levels.\",\n      \"method\": \"Bioenergetic analysis (mitochondrial oxygen consumption), quantification of 4'-phosphopantetheinylated proteins, RNA sequencing of patient fibroblasts\",\n      \"journal\": \"Annals of clinical and translational neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical measurements in patient-derived fibroblasts with two orthogonal methods (respirometry and phosphopantetheinylation quantification), single lab\",\n      \"pmids\": [\"38750253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Conditional, inducible neuron-specific deletion of Coasy in mice recapitulates key CoPAN features including motor deficits, neurodegeneration, iron dyshomeostasis, reduced survival, and extensive neuroinflammation. Treatment with leriglitazone (PPARγ agonist) improved motor performance, restored iron homeostasis, and attenuated neuroinflammation and neurodegeneration, establishing neuroinflammation as a pathogenic component downstream of CoA deficiency.\",\n      \"method\": \"Conditional neuron-specific Coasy knockout mouse model (inducible), behavioral assays, histopathology, iron quantification, pharmacological intervention with leriglitazone\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with multiple defined phenotypic readouts and pharmacological rescue, single lab\",\n      \"pmids\": [\"41985770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Robust CoAsy knockdown (>99%) in TNBC cell lines (HCC1806, MDA-MB-231) reduced CoA levels to approximately half normal but had no detectable effect on cell proliferation or migration in vitro, suggesting cells can maintain adequate CoA through compensatory mechanisms.\",\n      \"method\": \"Stable inducible shRNA knockdown, CoA level measurement in cell lysates, cell proliferation and migration assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — robust knockdown confirmed, direct CoA quantification, negative result for proliferation/migration across multiple shRNA constructs and cell lines\",\n      \"pmids\": [\"32828275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CoAsy loss in TNBC cells stabilizes HIF-1α and HIF-2α independently of the canonical oxygen-sensing pathway. Proximity-labelling proteomics revealed that CoAsy deficiency disrupts the association between HIF-1α and the proteasome through UBFD1, a CoA-binding protein that scaffolds HIFα for degradation. UBFD1's CoA-dependent interaction with HIFα is mediated by its PH domain, which undergoes CoAlation (a CoA-based post-translational modification). Restoring CoAsy expression in vivo suppresses lung metastasis.\",\n      \"method\": \"Proximity-labelling proteomics (BioID), HIF-α stability assays under normoxia, CoAsy knockdown/overexpression, in vivo tumor metastasis assay, identification of UBFD1 CoAlation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity-labelling proteomics with functional validation (HIF stabilization, in vivo metastasis), preprint not yet peer-reviewed, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.06.18.660436\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Antisense oligonucleotide (ASO) knockdown of COASY in mice reduced cholesterol content in liver lipid droplets and prevented CDAHFD diet-induced metabolic dysfunction-associated steatohepatitis (MASH) and the fibrotic response; these effects were abrogated by dietary cholesterol supplementation, placing COASY upstream of lipid droplet cholesterol accumulation in hepatic lipid metabolism.\",\n      \"method\": \"ASO-mediated Coasy knockdown in mice, liver lipid droplet cholesterol quantification, histopathological assessment of steatohepatitis and fibrosis, dietary cholesterol supplementation rescue\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genetic knockdown with biochemical quantification and dietary rescue in mouse model, preprint not yet peer-reviewed, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.02.25.640203\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"COASY encodes a bifunctional CoA synthase that catalyzes the final two steps of de novo CoA biosynthesis; it is essential for mitochondrial integrity and electron transport chain function (complexes I and III), regulates PI3K-AKT-mTOR signaling through direct interaction with PI3K-P85α, controls HIF-1α/2α stability via the CoA-binding scaffold protein UBFD1 and CoAlation, modulates BMP pathway activity during neural/vascular development, and influences liver lipid droplet cholesterol homeostasis, with loss-of-function causing neurodegeneration (CoPAN/PCH12) characterized by CoA deficiency, mitochondrial dysfunction, neuroinflammation, and iron dyshomeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"COASY encodes the bifunctional CoA synthase that catalyzes the terminal steps of de novo coenzyme A biosynthesis, an activity essential for normal development, mitochondrial function, and signaling across multiple tissues [#1, #2]. Its enzymatic role is established directly in patient fibroblasts, where biallelic loss-of-function variants abolish CoA synthase protein and activity and cause a lethal pontocerebellar hypoplasia phenotype [#2]; in zebrafish, loss of coasy depletes CoA and dorsalizes the embryo through reduced BMP receptor expression and BMP pathway activity, with rescue by exogenous CoA or wild-type but not mutant human COASY demonstrating that the developmental phenotypes are specifically attributable to CoA biosynthesis [#1]. COASY deficiency compromises mitochondrial integrity: loss diminishes assembly and activity of electron transport chain complexes I and III, lowers ATP production, and promotes mitochondrial DNA release and apoptosis [#3], and patient cells show impaired respiration with selectively reduced mitochondrial 4'-phosphopantetheinylated proteins despite preserved bulk CoA, indicating that COASY function is particularly critical for mitochondrial protein modification [#4]. In the nervous system, neuron-specific Coasy deletion in mice recapitulates CoPAN features including neurodegeneration, iron dyshomeostasis, and neuroinflammation, the last of which is a pathogenic component downstream of CoA deficiency and is attenuated by the PPARγ agonist leriglitazone [#5]. Beyond its canonical biosynthetic role, COASY directly binds the PI3K regulatory subunit PI3K-P85α to promote AKT/mTOR phosphorylation, cell survival, and DNA double-strand break repair [#0], and influences hepatic lipid droplet cholesterol homeostasis upstream of diet-induced steatohepatitis [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that COASY's developmental role operates through CoA biosynthesis rather than a CoA-independent function, by showing that loss-of-function phenotypes track with CoA depletion and require enzymatically functional protein for rescue.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish with CoA quantification, BMP pathway activity assays, and rescue with exogenous CoA and WT vs. mutant human COASY\",\n      \"pmids\": [\"27892483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not define how CoA depletion mechanistically reduces BMP receptor expression\", \"Mammalian developmental requirement not addressed here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked COASY loss-of-function directly to human disease by demonstrating that biallelic variants abolish CoA synthase enzymatic activity and protein in patient cells, causing lethal pontocerebellar hypoplasia.\",\n      \"evidence\": \"Whole-exome sequencing, RNA splice analysis, immunoblot, and CoA synthase activity assays in patient fibroblasts from two families\",\n      \"pmids\": [\"30089828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not resolve which downstream CoA-dependent processes drive the neurodevelopmental phenotype\", \"Tissue selectivity of the phenotype unexplained\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified a non-canonical role beyond CoA biosynthesis, showing COASY physically engages PI3K-P85α to drive AKT/mTOR signaling, survival, and DNA repair, and thereby modulates radiosensitivity.\",\n      \"evidence\": \"Reciprocal Co-IP, shRNA knockdown with AKT/mTOR phosphorylation and DNA repair readouts, and xenograft assays\",\n      \"pmids\": [\"31704889\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the PI3K interaction depends on CoA synthase catalytic activity is unresolved\", \"Structural basis of COASY-P85α binding unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Tested whether CoA biosynthesis is rate-limiting for cancer cell behavior, finding that robust COASY knockdown halves CoA but does not impair TNBC proliferation or migration, implying compensatory CoA maintenance.\",\n      \"evidence\": \"Stable inducible shRNA knockdown with CoA quantification and proliferation/migration assays across multiple constructs and cell lines\",\n      \"pmids\": [\"32828275\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Compensatory mechanisms maintaining CoA not identified\", \"Does not assess in vivo or metabolic stress conditions\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Refined the disease mechanism by showing COASY is critical for mitochondrial protein 4'-phosphopantetheinylation and respiration even when bulk CoA appears normal, shifting emphasis from total CoA pools to a specific mitochondrial modification.\",\n      \"evidence\": \"Respirometry, quantification of 4'-phosphopantetheinylated proteins, and RNA-seq in patient fibroblasts\",\n      \"pmids\": [\"38750253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The identity of the affected phosphopantetheinylated mitochondrial proteins is not defined\", \"Mechanistic link from reduced modification to respiratory defect not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the mitochondrial degeneration mechanism, showing COASY loss impairs ETC complex I and III assembly/activity, lowers ATP, and triggers mtDNA release and apoptosis.\",\n      \"evidence\": \"Drosophila muscle and brain knockdown with mitochondrial integrity, ETC complex, ATP, and mtDNA assays\",\n      \"pmids\": [\"39985665\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish whether complex defects are direct consequences of impaired phosphopantetheinylation\", \"mtDNA release trigger not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proposed a CoA-dependent signaling axis in which COASY controls HIF-1α/2α stability via CoAlation of the UBFD1 PH domain, scaffolding HIFα for proteasomal degradation independently of oxygen sensing.\",\n      \"evidence\": \"Proximity-labelling proteomics (BioID), HIFα stability assays under normoxia, knockdown/overexpression, and in vivo metastasis assay (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.06.18.660436\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed and from a single lab\", \"Direct demonstration that UBFD1 CoAlation is required in vivo is incomplete\", \"Generality beyond TNBC unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended COASY's physiological reach to hepatic lipid metabolism, placing it upstream of lipid droplet cholesterol accumulation and diet-induced steatohepatitis.\",\n      \"evidence\": \"ASO-mediated Coasy knockdown in mice with lipid droplet cholesterol quantification, steatohepatitis/fibrosis histopathology, and dietary cholesterol rescue (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.02.25.640203\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed and from a single lab\", \"Molecular link between CoA biosynthesis and lipid droplet cholesterol not defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identified neuroinflammation as a tractable pathogenic component of CoA-deficiency neurodegeneration and a candidate therapeutic node.\",\n      \"evidence\": \"Inducible neuron-specific Coasy knockout mice with behavioral, histopathological, and iron readouts plus leriglitazone (PPARγ agonist) intervention\",\n      \"pmids\": [\"41985770\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking CoA loss to iron dyshomeostasis not resolved\", \"Whether leriglitazone acts on neurons or glia is unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how COASY's catalytic CoA-synthesizing function is mechanistically coupled to its signaling roles (PI3K-AKT-mTOR, HIFα/UBFD1) and to tissue-selective phenotypes, and whether these depend on CoA, CoAlation, or CoA-independent protein interactions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model integrating catalytic and scaffolding activities\", \"CoAlation substrate repertoire incompletely mapped\", \"Basis of tissue selectivity (neuron vs. liver vs. tumor) unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PIK3R1\", \"UBFD1\", \"HIF1A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":5,"faith_total":5,"faith_pct":100.0}}