{"gene":"CDS2","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1997,"finding":"CDS2 (CDP-diacylglycerol synthetase 2) was identified as a second human CDS enzyme in the EST database. Overexpression of CDS1 or PIS1 alone or in combination did not enhance the rate of phosphatidylinositol biosynthesis, indicating that the levels of CDS1 and PIS1 protein expression are not critical determinants of cellular PI content.","method":"cDNA cloning from EST database, COS-7 cell overexpression, phospholipid metabolic assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzymatic activity confirmed in overexpression system, multiple biochemical assays, single lab","pmids":["9407135"],"is_preprint":false},{"year":1998,"finding":"Two human CDP-diacylglycerol synthase genes, CDS1 and CDS2, were cloned and localized to chromosomes 4q21 and 20p13, respectively, by radiation hybrid panel mapping and FISH.","method":"cDNA cloning, radiation hybrid panel mapping, fluorescence in situ hybridization","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct chromosomal localization by two orthogonal methods, single lab","pmids":["9806839"],"is_preprint":false},{"year":1999,"finding":"Human CDS2 was identified as a mammalian homolog of Drosophila CDS, encoding CDP-diacylglycerol synthase. Mouse Cds2 (but not Cds1) showed high expression in differentiating neuroblasts of the neural retina and CNS during embryonic development, with no detection in adult retina, while Cds1 was highly expressed in the photoreceptor layer of adult retina.","method":"Bioinformatic identification, cDNA isolation and sequencing, RNA in situ hybridization on mouse tissue sections","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by in situ hybridization, single lab, two orthogonal methods","pmids":["9889000"],"is_preprint":false},{"year":2003,"finding":"CDS-2 activity and mRNA level in mouse heart were elevated by PPARα activation (clofibrate feeding) in vivo; in PPARα-null mice, clofibrate feeding did not alter CDS-2 activity or mRNA level, confirming CDS-2 is regulated by PPARα activation. CDS-2 activity was not affected by clofibrate in H9c2 cells in vitro, indicating alternative regulation in vivo versus cultured cells.","method":"In vivo clofibrate treatment, PPARα-null mouse model, enzyme activity assays, mRNA quantification","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via knockout model, enzyme activity assays, single lab","pmids":["14594999"],"is_preprint":false},{"year":2005,"finding":"Murine Cds1 and Cds2 proteins, when transiently transfected with epitope tags, were both associated with the endoplasmic reticulum. Cds2 shows ubiquitous expression while Cds1 shows restricted expression including in photoreceptor inner segments.","method":"Transient transfection of epitope-tagged proteins, subcellular localization by immunofluorescence, RNA in situ hybridization","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — ER localization by tagged overexpression, expression pattern by ISH, single lab","pmids":["16023307"],"is_preprint":false},{"year":2010,"finding":"Knockdown of CDS-2 (via shRNA) disrupted cardiolipin biosynthesis and eliminated mitomycin C-induced translocation of p53 to mitochondria, as well as reducing mitochondrial distribution of Bcl-xL and Bcl-2, placing CDS2-dependent cardiolipin synthesis upstream of mitochondrial p53 localization and apoptosis regulation.","method":"shRNA knockdown of CDS-2, immunofluorescence for mitochondrial p53 localization, Western blot for Bcl-xL/Bcl-2","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with specific molecular phenotype, multiple readouts, single lab","pmids":["20126473"],"is_preprint":false},{"year":2016,"finding":"Knockdown of CDS2 (or CDS1) resulted in formation of giant/supersized lipid droplets in cultured mammalian cells and dramatically increased PA levels in the endoplasmic reticulum. Depleting CDS2 had a moderate inhibitory effect on 3T3-L1 preadipocyte differentiation. The increase in ER PA levels upon CDS2 knockdown suggests PA accumulation underlies the lipid droplet phenotype.","method":"siRNA knockdown, lipid droplet imaging, phospholipid mass spectrometry, adipocyte differentiation assay","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (imaging, lipidomics, differentiation assay), independently supported by subsequent papers","pmids":["26946540"],"is_preprint":false},{"year":2017,"finding":"Mitochondrial CDP-diacylglycerol synthase activity was found to be due to TAMM41 (a peripheral mitochondrial protein), not CDS1 or CDS2 (integral membrane proteins). CDS1 and CDS2 are localized to the endoplasmic reticulum, not mitochondria.","method":"Subcellular fractionation, Western blot, TAMM41 knockdown, enzyme activity assays, H9c2 differentiation","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical fractionation, knockdown with activity assay, refutes prior localization claim with multiple methods","pmids":["29253589"],"is_preprint":false},{"year":2018,"finding":"p53 physically interacts with SIRT6 in vitro and in vivo, and together they bind the promoters of CDS1 and CDS2 to enhance cardiolipin de novo biosynthesis; SIRT6 acts as a co-activator of p53, recruiting RNA polymerase II to CDS1 and CDS2 promoters in response to palmitic acid treatment.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), in vitro binding assay, cardiolipin biosynthesis assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and ChIP, single lab, two orthogonal methods","pmids":["30237540"],"is_preprint":false},{"year":2019,"finding":"Genetic ablation of CDS2 in zebrafish and mice switched VEGFA signaling output from promoting angiogenesis to inducing vessel regression. Mechanistically, VEGFA stimulation in CDS2-null endothelium reduced PIP2 availability, causing PIP3 deficiency and FOXO1 activation, which triggered endothelial regression. Re-expression experiments and live imaging confirmed this mechanism.","method":"Zebrafish cds2 mutant, mouse conditional knockout, live imaging, PIP2/PIP3 quantification, FOXO1 localization, tumor implantation models","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple model organisms, live imaging, lipid quantification, pathway epistasis with FOXO1, single lab with multiple orthogonal methods","pmids":["31501519"],"is_preprint":false},{"year":2019,"finding":"CDS2, but not CDS1, contributes to increased PI resynthesis during PLC activation and preferentially routes arachidonoyl-enriched PA species toward PI synthesis, contributing to maintenance of the unique fatty acid profile of phosphoinositide lipids.","method":"siRNA knockdown, stable isotope labeling with 13C-glucose, LC-MS lipid analysis","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isotope tracing with mass spectrometry, loss-of-function, single lab","pmids":["35712788"],"is_preprint":false},{"year":2019,"finding":"CDS2-deficient lipid droplet phenotype is rescued by reducing DGAT2 or GPAT4 expression (but not by reducing CIDEC), while CDS1-deficient LD phenotype is rescued by CIDEC knockdown (but not DGAT2/GPAT4), demonstrating that CDS1 and CDS2 regulate lipid droplet growth through distinct mechanisms. CDS2 deficiency promoted LD association of DGAT2 and GPAT4 and impaired initial LD maturation. CDS2 had a stronger effect on PA levels at the LD surface.","method":"siRNA knockdown, CRISPR/Cas9 knockout, immunofluorescence, fluorescence microscopy, lipidomics","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR knockout plus siRNA, multiple epistasis experiments, fluorescence microscopy, single lab with multiple orthogonal methods","pmids":["31548309"],"is_preprint":false},{"year":2019,"finding":"Vasopressin selectively stimulates an increase in CDS1 (not CDS2) mRNA in H9c2 cardiomyoblasts, mediated through phospholipase C, protein kinase C, and cFos (AP-1); this mechanism provides upregulation of PI resynthesis specifically through CDS1 during sustained PLC signaling.","method":"RT-qPCR, AP-1 inhibitor (T-5224), PKC inhibitor, Western blot for cFos","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibitor epistasis, mRNA quantification, single lab","pmids":["30862571"],"is_preprint":false},{"year":2020,"finding":"CDS enzymes CDS1 and CDS2 are ancient integral membrane proteins localized to the ER in mammals, providing CDP-DAG for PI synthesis; CDS2 is suggested to be the major CDS for phosphoinositide recycling during PLC signaling based on reviewed experimental evidence.","method":"Review synthesizing localization and functional data from multiple experimental studies","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — synthesis of multiple experimental findings, not primary experiments; ER localization supported by direct experimental studies cited","pmids":["32117988"],"is_preprint":false},{"year":2021,"finding":"Liver-specific Cds2 deficiency in mice provoked hepatic steatosis, inflammation and fibrosis. CDS2 is enriched in mitochondria-associated membranes (MAMs). Hepatic Cds2 deficiency impaired mitochondrial function and decreased mitochondrial PE levels. Overexpression of phosphatidylserine decarboxylase (PISD) alleviated the NASH-like phenotype and mitochondrial dysfunction caused by CDS2 deficiency. PPARα agonist treatment also attenuated mitochondrial defects. Cds2 overexpression protected against high-fat diet-induced hepatic steatosis.","method":"Liver-specific conditional knockout (Cds2f/f;AlbCre), mitochondrial fractionation, lipidomics, PISD overexpression rescue, electron microscopy, PPARα agonist treatment, Cds2 overexpression","journal":"Science bulletin","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with rescue experiments, subcellular fractionation, lipidomics, multiple orthogonal approaches, gain- and loss-of-function","pmids":["36546079"],"is_preprint":false},{"year":2024,"finding":"Genetic deletion of CDS2 in primary mouse macrophages resulted in modest changes in steady-state PI levels but substantial increases in PA, CDP-DG, DG, and TG. Stable isotope labeling showed CDS2 loss caused minimal reduction in basal de novo PI synthesis rate but substantially increased de novo PA synthesis from glycerol-3-phosphate (G3P). Under sustained GPCR-stimulated PLC conditions, CDS2-deficient macrophages could not maintain enhanced PI synthesis via the 'PI cycle', leading to substantial PI loss. CDS2-deficient macrophages exhibited defects in calcium homeostasis unrelated to PLC activation.","method":"CRISPR/Cas9 deletion, stable isotope labeling (13C6- and 13C6D7-glucose), LC-MS lipidomics, GPCR stimulation assays, calcium imaging","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic deletion with multiple stable isotope tracing experiments, mechanistic dissection of PA synthesis vs PI cycle, multiple orthogonal methods in single rigorous study","pmids":["39312194"],"is_preprint":false},{"year":2025,"finding":"CDS2 is a synthetic lethal dependency in uveal melanoma and other tumor types with low CDS1 expression. CDS2 knockout in low-CDS1 cancer cells disrupted phosphoinositide synthesis, increased cellular apoptosis, and re-expression of CDS1 rescued this cell fitness defect, establishing CDS1/CDS2 as a functionally redundant synthetic lethal pair. The synthetic lethality was validated in vivo.","method":"CRISPR-Cas9 screening (single-gene and combinatorial paired-gene libraries), CDS1 re-expression rescue, in vivo xenograft models, pan-cancer data analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genome-wide CRISPR screens, in vivo validation, rescue experiments, multiple cell lines, validated by two independent concurrent publications","pmids":["40615675"],"is_preprint":false},{"year":2025,"finding":"CDS2 essentiality in mesenchymal-like cancers with low/absent CDS1 expression is mechanistically driven by CDS2 dosage and catalytic activity (not a scaffolding role). CDS1-CDS2 synthetic lethality is accompanied by disruption of lipid homeostasis including accumulation of cholesterol esters and triglycerides, and apoptosis. Genome-wide CRISPR knockout screens identified no common escape mechanism, indicating robustness of the interaction.","method":"Computational SLI analysis, CRISPR-Cas9 knockout screens, catalytic mutant rescue experiments, lipidomics, apoptosis assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — catalytic mutant analysis, genome-wide CRISPR screens, lipidomics, replicated across multiple cancer contexts, concurrent with independent study","pmids":["40615674"],"is_preprint":false},{"year":2025,"finding":"Under physiological conditions, MBOAT7 interacts with CDS2 at the endoplasmic reticulum to maintain lipid metabolic homeostasis. Disruption of this interaction (via CDS2 knockdown or loss of function) triggers adaptive translocation of MBOAT7 to ER-lipid droplet contact sites in a RAB1-dependent manner, where it inhibits DGAT2-mediated lipid droplet growth and promotes lipolysis.","method":"Co-immunoprecipitation, confocal microscopy, siRNA knockdown, RAB1 manipulation, lipid droplet assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for interaction, live imaging for translocation, functional epistasis with DGAT2; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.08.26.672501"],"is_preprint":true}],"current_model":"CDS2 is an ER-resident integral membrane enzyme that converts phosphatidic acid to CDP-diacylglycerol, functioning as a rate-limiting step in phosphatidylinositol (and cardiolipin) de novo synthesis; it is the primary CDS isoform supporting PI resynthesis during PLC-driven phosphoinositide recycling, maintains PIP2/PIP3 homeostasis in endothelial cells (such that its loss redirects VEGFA signaling from angiogenesis to vessel regression via FOXO1 activation), controls ER PA levels and lipid droplet size through a distinct mechanism from CDS1 (involving DGAT2/GPAT4 recruitment), is enriched at mitochondria-associated membranes where it supports mitochondrial PE levels and function, and forms a synthetic lethal pair with CDS1 such that in tumors or cells with low CDS1 expression, CDS2 loss disrupts phosphoinositide synthesis and triggers apoptosis, making it a pharmacologically tractable cancer target."},"narrative":{"mechanistic_narrative":"CDS2 is an ER-resident integral membrane CDP-diacylglycerol synthase that converts phosphatidic acid (PA) to CDP-diacylglycerol, supplying the activated lipid intermediate for de novo phosphatidylinositol synthesis [PMID:9407135, PMID:29253589, PMID:32117988]. Among the two mammalian CDS isoforms, CDS2 is the principal enzyme sustaining PI resynthesis during PLC-driven phosphoinositide recycling, where it preferentially channels arachidonoyl-enriched PA species toward PI and is required to maintain enhanced PI synthesis through the PI cycle under sustained receptor stimulation; its loss instead drives accumulation of PA, CDP-DG, DG, and TG [PMID:35712788, PMID:39312194]. By controlling ER and lipid-droplet PA levels, CDS2 restrains lipid droplet growth through a mechanism distinct from CDS1, with its deficiency promoting LD association of DGAT2 and GPAT4 and producing giant lipid droplets [PMID:26946540, PMID:31548309]. In endothelium, CDS2-dependent maintenance of PIP2/PIP3 governs VEGFA signaling output, such that CDS2 ablation reduces PIP3, activates FOXO1, and switches angiogenesis to vessel regression [PMID:31501519]. CDS2 is enriched at mitochondria-associated membranes and supports mitochondrial PE levels and function, with liver-specific loss provoking a NASH-like phenotype that is rescued by PISD overexpression [PMID:36546079]. CDS2 and CDS1 form a functionally redundant synthetic lethal pair: in tumors with low CDS1 expression, CDS2 loss disrupts phosphoinositide synthesis and triggers apoptosis in a manner dependent on CDS2 catalytic activity, defining CDS2 as a tractable cancer dependency [PMID:40615675, PMID:40615674].","teleology":[{"year":1998,"claim":"Establishing that mammals encode two distinct CDP-diacylglycerol synthases set the stage for dissecting isoform-specific roles in phospholipid synthesis.","evidence":"cDNA cloning of CDS1 and CDS2 with radiation hybrid and FISH chromosomal mapping; identification as homolog of Drosophila CDS","pmids":["9407135","9806839","9889000"],"confidence":"Medium","gaps":["Catalytic mechanism and substrate specificity not resolved at cloning","Functional difference between CDS1 and CDS2 not yet addressed"]},{"year":2005,"claim":"Localizing both isoforms answered where CDS2 acts, placing the enzyme at the ER and distinguishing its ubiquitous expression from the restricted distribution of CDS1.","evidence":"Transient transfection of epitope-tagged murine Cds1/Cds2 with immunofluorescence and in situ hybridization","pmids":["16023307"],"confidence":"Medium","gaps":["Based on tagged overexpression rather than endogenous protein","Submembrane/contact-site localization not addressed"]},{"year":2017,"claim":"Resolving an earlier mitochondrial attribution clarified that CDS2 is an ER integral membrane enzyme and that mitochondrial CDP-DAG synthesis is provided by TAMM41, sharpening the compartmental model.","evidence":"Subcellular fractionation, TAMM41 knockdown, and enzyme activity assays","pmids":["29253589"],"confidence":"High","gaps":["Does not exclude MAM-localized CDS2 contributions to mitochondrial lipids","Reconciliation with CDS2-dependent cardiolipin phenotypes not addressed"]},{"year":2019,"claim":"Connecting CDS2 to phosphoinositide pools demonstrated its physiological role in PI cycle recycling and in tuning VEGFA-driven endothelial behavior, moving the enzyme from a biosynthetic step to a signaling controller.","evidence":"Zebrafish and mouse knockouts with live imaging and PIP2/PIP3 quantification; isotope tracing with LC-MS showing arachidonoyl-PA routing to PI","pmids":["31501519","35712788"],"confidence":"High","gaps":["Mechanism of arachidonoyl-PA species selection not defined","How CDS2 is recruited to PLC-active sites unknown"]},{"year":2019,"claim":"Defining the lipid droplet phenotype showed CDS2 restrains LD growth through a CDS1-distinct, DGAT2/GPAT4-dependent route driven by PA accumulation, separating the two isoforms mechanistically.","evidence":"siRNA and CRISPR knockout with epistasis rescues (DGAT2/GPAT4 vs CIDEC), lipidomics, and fluorescence microscopy","pmids":["26946540","31548309"],"confidence":"High","gaps":["Direct biochemical link between surface PA and DGAT2/GPAT4 recruitment not established","Whether enzymatic activity per se or PA level drives LD effect not fully separated"]},{"year":2021,"claim":"Liver-specific loss tied CDS2 to mitochondria-associated membranes and mitochondrial PE homeostasis, explaining how its deficiency produces metabolic disease.","evidence":"Hepatocyte conditional knockout with mitochondrial fractionation, lipidomics, PISD-overexpression and PPARα-agonist rescue","pmids":["36546079"],"confidence":"High","gaps":["Molecular basis of CDS2 enrichment at MAMs unknown","How ER CDP-DAG output feeds mitochondrial PE not mechanistically traced"]},{"year":2024,"claim":"Quantitative tracing in macrophages distinguished CDS2's modest role in basal PI synthesis from its essential role in sustaining PI-cycle flux, refining where the enzyme is rate-limiting.","evidence":"CRISPR deletion with dual stable-isotope labeling, LC-MS lipidomics, GPCR-stimulated PLC assays, and calcium imaging","pmids":["39312194"],"confidence":"High","gaps":["Origin of the PLC-independent calcium homeostasis defect unexplained","Whether CDS1 compensates basal synthesis not directly tested here"]},{"year":2025,"claim":"Genome-scale screens established CDS1/CDS2 as a robust synthetic lethal pair, demonstrating that CDS2 catalytic activity becomes essential in low-CDS1 tumors and nominating it as a cancer target.","evidence":"Single-gene and paired CRISPR screens, catalytic-mutant and CDS1 re-expression rescues, lipidomics, apoptosis assays, and in vivo xenografts","pmids":["40615675","40615674"],"confidence":"High","gaps":["Structural basis for catalysis and potential inhibitor binding not defined","Determinants of CDS1 silencing across tumor types not addressed"]},{"year":2025,"claim":"A proposed CDS2-MBOAT7 ER interaction introduces a candidate adaptive response coupling CDS2 loss to lipid droplet regulation, but this awaits peer-reviewed confirmation.","evidence":"Co-immunoprecipitation, confocal imaging, RAB1 manipulation, and LD assays (preprint)","pmids":["bio_10.1101_2025.08.26.672501"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Reciprocal/structural validation of CDS2-MBOAT7 binding not shown","Physiological significance of MBOAT7 relocalization unestablished"]},{"year":null,"claim":"How CDS2 is recruited and regulated at distinct membrane subdomains (PLC-active sites, lipid droplet contacts, MAMs) to channel specific PA species into different downstream lipids remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of substrate selection or activity regulation","Mechanism of spatial targeting to subcompartments unknown","Direct regulators of CDS2 activity (vs transcriptional control) uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,7,10,17]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,7,13,18]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[6,10,14,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,15]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,16,17]}],"complexes":[],"partners":["CDS1","MBOAT7","DGAT2","GPAT4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95674","full_name":"Phosphatidate cytidylyltransferase 2","aliases":["CDP-DAG synthase 2","CDP-DG synthase 2","CDP-diacylglycerol synthase 2","CDS 2","CDP-diglyceride pyrophosphorylase 2","CDP-diglyceride synthase 2","CTP:phosphatidate cytidylyltransferase 2"],"length_aa":445,"mass_kda":51.4,"function":"Catalyzes the conversion of phosphatidic acid (PA) to CDP-diacylglycerol (CDP-DAG), an essential intermediate in the synthesis of phosphatidylglycerol, cardiolipin and phosphatidylinositol (PubMed:25375833). Exhibits specificity for the nature of the acyl chains at the sn-1 and sn-2 positions in the substrate, PA and the preferred acyl chain composition is 1-stearoyl-2-arachidonoyl-sn-phosphatidic acid (PubMed:25375833). 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Overexpression of CDS1 or PIS1 alone or in combination did not enhance the rate of phosphatidylinositol biosynthesis, indicating that the levels of CDS1 and PIS1 protein expression are not critical determinants of cellular PI content.\",\n      \"method\": \"cDNA cloning from EST database, COS-7 cell overexpression, phospholipid metabolic assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzymatic activity confirmed in overexpression system, multiple biochemical assays, single lab\",\n      \"pmids\": [\"9407135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Two human CDP-diacylglycerol synthase genes, CDS1 and CDS2, were cloned and localized to chromosomes 4q21 and 20p13, respectively, by radiation hybrid panel mapping and FISH.\",\n      \"method\": \"cDNA cloning, radiation hybrid panel mapping, fluorescence in situ hybridization\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromosomal localization by two orthogonal methods, single lab\",\n      \"pmids\": [\"9806839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Human CDS2 was identified as a mammalian homolog of Drosophila CDS, encoding CDP-diacylglycerol synthase. Mouse Cds2 (but not Cds1) showed high expression in differentiating neuroblasts of the neural retina and CNS during embryonic development, with no detection in adult retina, while Cds1 was highly expressed in the photoreceptor layer of adult retina.\",\n      \"method\": \"Bioinformatic identification, cDNA isolation and sequencing, RNA in situ hybridization on mouse tissue sections\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by in situ hybridization, single lab, two orthogonal methods\",\n      \"pmids\": [\"9889000\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CDS-2 activity and mRNA level in mouse heart were elevated by PPARα activation (clofibrate feeding) in vivo; in PPARα-null mice, clofibrate feeding did not alter CDS-2 activity or mRNA level, confirming CDS-2 is regulated by PPARα activation. CDS-2 activity was not affected by clofibrate in H9c2 cells in vitro, indicating alternative regulation in vivo versus cultured cells.\",\n      \"method\": \"In vivo clofibrate treatment, PPARα-null mouse model, enzyme activity assays, mRNA quantification\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via knockout model, enzyme activity assays, single lab\",\n      \"pmids\": [\"14594999\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Murine Cds1 and Cds2 proteins, when transiently transfected with epitope tags, were both associated with the endoplasmic reticulum. Cds2 shows ubiquitous expression while Cds1 shows restricted expression including in photoreceptor inner segments.\",\n      \"method\": \"Transient transfection of epitope-tagged proteins, subcellular localization by immunofluorescence, RNA in situ hybridization\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — ER localization by tagged overexpression, expression pattern by ISH, single lab\",\n      \"pmids\": [\"16023307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Knockdown of CDS-2 (via shRNA) disrupted cardiolipin biosynthesis and eliminated mitomycin C-induced translocation of p53 to mitochondria, as well as reducing mitochondrial distribution of Bcl-xL and Bcl-2, placing CDS2-dependent cardiolipin synthesis upstream of mitochondrial p53 localization and apoptosis regulation.\",\n      \"method\": \"shRNA knockdown of CDS-2, immunofluorescence for mitochondrial p53 localization, Western blot for Bcl-xL/Bcl-2\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with specific molecular phenotype, multiple readouts, single lab\",\n      \"pmids\": [\"20126473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Knockdown of CDS2 (or CDS1) resulted in formation of giant/supersized lipid droplets in cultured mammalian cells and dramatically increased PA levels in the endoplasmic reticulum. Depleting CDS2 had a moderate inhibitory effect on 3T3-L1 preadipocyte differentiation. The increase in ER PA levels upon CDS2 knockdown suggests PA accumulation underlies the lipid droplet phenotype.\",\n      \"method\": \"siRNA knockdown, lipid droplet imaging, phospholipid mass spectrometry, adipocyte differentiation assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (imaging, lipidomics, differentiation assay), independently supported by subsequent papers\",\n      \"pmids\": [\"26946540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mitochondrial CDP-diacylglycerol synthase activity was found to be due to TAMM41 (a peripheral mitochondrial protein), not CDS1 or CDS2 (integral membrane proteins). CDS1 and CDS2 are localized to the endoplasmic reticulum, not mitochondria.\",\n      \"method\": \"Subcellular fractionation, Western blot, TAMM41 knockdown, enzyme activity assays, H9c2 differentiation\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical fractionation, knockdown with activity assay, refutes prior localization claim with multiple methods\",\n      \"pmids\": [\"29253589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"p53 physically interacts with SIRT6 in vitro and in vivo, and together they bind the promoters of CDS1 and CDS2 to enhance cardiolipin de novo biosynthesis; SIRT6 acts as a co-activator of p53, recruiting RNA polymerase II to CDS1 and CDS2 promoters in response to palmitic acid treatment.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP), in vitro binding assay, cardiolipin biosynthesis assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and ChIP, single lab, two orthogonal methods\",\n      \"pmids\": [\"30237540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Genetic ablation of CDS2 in zebrafish and mice switched VEGFA signaling output from promoting angiogenesis to inducing vessel regression. Mechanistically, VEGFA stimulation in CDS2-null endothelium reduced PIP2 availability, causing PIP3 deficiency and FOXO1 activation, which triggered endothelial regression. Re-expression experiments and live imaging confirmed this mechanism.\",\n      \"method\": \"Zebrafish cds2 mutant, mouse conditional knockout, live imaging, PIP2/PIP3 quantification, FOXO1 localization, tumor implantation models\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple model organisms, live imaging, lipid quantification, pathway epistasis with FOXO1, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31501519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDS2, but not CDS1, contributes to increased PI resynthesis during PLC activation and preferentially routes arachidonoyl-enriched PA species toward PI synthesis, contributing to maintenance of the unique fatty acid profile of phosphoinositide lipids.\",\n      \"method\": \"siRNA knockdown, stable isotope labeling with 13C-glucose, LC-MS lipid analysis\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isotope tracing with mass spectrometry, loss-of-function, single lab\",\n      \"pmids\": [\"35712788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDS2-deficient lipid droplet phenotype is rescued by reducing DGAT2 or GPAT4 expression (but not by reducing CIDEC), while CDS1-deficient LD phenotype is rescued by CIDEC knockdown (but not DGAT2/GPAT4), demonstrating that CDS1 and CDS2 regulate lipid droplet growth through distinct mechanisms. CDS2 deficiency promoted LD association of DGAT2 and GPAT4 and impaired initial LD maturation. CDS2 had a stronger effect on PA levels at the LD surface.\",\n      \"method\": \"siRNA knockdown, CRISPR/Cas9 knockout, immunofluorescence, fluorescence microscopy, lipidomics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR knockout plus siRNA, multiple epistasis experiments, fluorescence microscopy, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31548309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Vasopressin selectively stimulates an increase in CDS1 (not CDS2) mRNA in H9c2 cardiomyoblasts, mediated through phospholipase C, protein kinase C, and cFos (AP-1); this mechanism provides upregulation of PI resynthesis specifically through CDS1 during sustained PLC signaling.\",\n      \"method\": \"RT-qPCR, AP-1 inhibitor (T-5224), PKC inhibitor, Western blot for cFos\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibitor epistasis, mRNA quantification, single lab\",\n      \"pmids\": [\"30862571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CDS enzymes CDS1 and CDS2 are ancient integral membrane proteins localized to the ER in mammals, providing CDP-DAG for PI synthesis; CDS2 is suggested to be the major CDS for phosphoinositide recycling during PLC signaling based on reviewed experimental evidence.\",\n      \"method\": \"Review synthesizing localization and functional data from multiple experimental studies\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — synthesis of multiple experimental findings, not primary experiments; ER localization supported by direct experimental studies cited\",\n      \"pmids\": [\"32117988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Liver-specific Cds2 deficiency in mice provoked hepatic steatosis, inflammation and fibrosis. CDS2 is enriched in mitochondria-associated membranes (MAMs). Hepatic Cds2 deficiency impaired mitochondrial function and decreased mitochondrial PE levels. Overexpression of phosphatidylserine decarboxylase (PISD) alleviated the NASH-like phenotype and mitochondrial dysfunction caused by CDS2 deficiency. PPARα agonist treatment also attenuated mitochondrial defects. Cds2 overexpression protected against high-fat diet-induced hepatic steatosis.\",\n      \"method\": \"Liver-specific conditional knockout (Cds2f/f;AlbCre), mitochondrial fractionation, lipidomics, PISD overexpression rescue, electron microscopy, PPARα agonist treatment, Cds2 overexpression\",\n      \"journal\": \"Science bulletin\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with rescue experiments, subcellular fractionation, lipidomics, multiple orthogonal approaches, gain- and loss-of-function\",\n      \"pmids\": [\"36546079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Genetic deletion of CDS2 in primary mouse macrophages resulted in modest changes in steady-state PI levels but substantial increases in PA, CDP-DG, DG, and TG. Stable isotope labeling showed CDS2 loss caused minimal reduction in basal de novo PI synthesis rate but substantially increased de novo PA synthesis from glycerol-3-phosphate (G3P). Under sustained GPCR-stimulated PLC conditions, CDS2-deficient macrophages could not maintain enhanced PI synthesis via the 'PI cycle', leading to substantial PI loss. CDS2-deficient macrophages exhibited defects in calcium homeostasis unrelated to PLC activation.\",\n      \"method\": \"CRISPR/Cas9 deletion, stable isotope labeling (13C6- and 13C6D7-glucose), LC-MS lipidomics, GPCR stimulation assays, calcium imaging\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic deletion with multiple stable isotope tracing experiments, mechanistic dissection of PA synthesis vs PI cycle, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"39312194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDS2 is a synthetic lethal dependency in uveal melanoma and other tumor types with low CDS1 expression. CDS2 knockout in low-CDS1 cancer cells disrupted phosphoinositide synthesis, increased cellular apoptosis, and re-expression of CDS1 rescued this cell fitness defect, establishing CDS1/CDS2 as a functionally redundant synthetic lethal pair. The synthetic lethality was validated in vivo.\",\n      \"method\": \"CRISPR-Cas9 screening (single-gene and combinatorial paired-gene libraries), CDS1 re-expression rescue, in vivo xenograft models, pan-cancer data analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genome-wide CRISPR screens, in vivo validation, rescue experiments, multiple cell lines, validated by two independent concurrent publications\",\n      \"pmids\": [\"40615675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDS2 essentiality in mesenchymal-like cancers with low/absent CDS1 expression is mechanistically driven by CDS2 dosage and catalytic activity (not a scaffolding role). CDS1-CDS2 synthetic lethality is accompanied by disruption of lipid homeostasis including accumulation of cholesterol esters and triglycerides, and apoptosis. Genome-wide CRISPR knockout screens identified no common escape mechanism, indicating robustness of the interaction.\",\n      \"method\": \"Computational SLI analysis, CRISPR-Cas9 knockout screens, catalytic mutant rescue experiments, lipidomics, apoptosis assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — catalytic mutant analysis, genome-wide CRISPR screens, lipidomics, replicated across multiple cancer contexts, concurrent with independent study\",\n      \"pmids\": [\"40615674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Under physiological conditions, MBOAT7 interacts with CDS2 at the endoplasmic reticulum to maintain lipid metabolic homeostasis. Disruption of this interaction (via CDS2 knockdown or loss of function) triggers adaptive translocation of MBOAT7 to ER-lipid droplet contact sites in a RAB1-dependent manner, where it inhibits DGAT2-mediated lipid droplet growth and promotes lipolysis.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy, siRNA knockdown, RAB1 manipulation, lipid droplet assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for interaction, live imaging for translocation, functional epistasis with DGAT2; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.08.26.672501\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CDS2 is an ER-resident integral membrane enzyme that converts phosphatidic acid to CDP-diacylglycerol, functioning as a rate-limiting step in phosphatidylinositol (and cardiolipin) de novo synthesis; it is the primary CDS isoform supporting PI resynthesis during PLC-driven phosphoinositide recycling, maintains PIP2/PIP3 homeostasis in endothelial cells (such that its loss redirects VEGFA signaling from angiogenesis to vessel regression via FOXO1 activation), controls ER PA levels and lipid droplet size through a distinct mechanism from CDS1 (involving DGAT2/GPAT4 recruitment), is enriched at mitochondria-associated membranes where it supports mitochondrial PE levels and function, and forms a synthetic lethal pair with CDS1 such that in tumors or cells with low CDS1 expression, CDS2 loss disrupts phosphoinositide synthesis and triggers apoptosis, making it a pharmacologically tractable cancer target.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDS2 is an ER-resident integral membrane CDP-diacylglycerol synthase that converts phosphatidic acid (PA) to CDP-diacylglycerol, supplying the activated lipid intermediate for de novo phosphatidylinositol synthesis [#0, #7, #13]. Among the two mammalian CDS isoforms, CDS2 is the principal enzyme sustaining PI resynthesis during PLC-driven phosphoinositide recycling, where it preferentially channels arachidonoyl-enriched PA species toward PI and is required to maintain enhanced PI synthesis through the PI cycle under sustained receptor stimulation; its loss instead drives accumulation of PA, CDP-DG, DG, and TG [#10, #15]. By controlling ER and lipid-droplet PA levels, CDS2 restrains lipid droplet growth through a mechanism distinct from CDS1, with its deficiency promoting LD association of DGAT2 and GPAT4 and producing giant lipid droplets [#6, #11]. In endothelium, CDS2-dependent maintenance of PIP2/PIP3 governs VEGFA signaling output, such that CDS2 ablation reduces PIP3, activates FOXO1, and switches angiogenesis to vessel regression [#9]. CDS2 is enriched at mitochondria-associated membranes and supports mitochondrial PE levels and function, with liver-specific loss provoking a NASH-like phenotype that is rescued by PISD overexpression [#14]. CDS2 and CDS1 form a functionally redundant synthetic lethal pair: in tumors with low CDS1 expression, CDS2 loss disrupts phosphoinositide synthesis and triggers apoptosis in a manner dependent on CDS2 catalytic activity, defining CDS2 as a tractable cancer dependency [#16, #17].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing that mammals encode two distinct CDP-diacylglycerol synthases set the stage for dissecting isoform-specific roles in phospholipid synthesis.\",\n      \"evidence\": \"cDNA cloning of CDS1 and CDS2 with radiation hybrid and FISH chromosomal mapping; identification as homolog of Drosophila CDS\",\n      \"pmids\": [\"9407135\", \"9806839\", \"9889000\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Catalytic mechanism and substrate specificity not resolved at cloning\", \"Functional difference between CDS1 and CDS2 not yet addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localizing both isoforms answered where CDS2 acts, placing the enzyme at the ER and distinguishing its ubiquitous expression from the restricted distribution of CDS1.\",\n      \"evidence\": \"Transient transfection of epitope-tagged murine Cds1/Cds2 with immunofluorescence and in situ hybridization\",\n      \"pmids\": [\"16023307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Based on tagged overexpression rather than endogenous protein\", \"Submembrane/contact-site localization not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Resolving an earlier mitochondrial attribution clarified that CDS2 is an ER integral membrane enzyme and that mitochondrial CDP-DAG synthesis is provided by TAMM41, sharpening the compartmental model.\",\n      \"evidence\": \"Subcellular fractionation, TAMM41 knockdown, and enzyme activity assays\",\n      \"pmids\": [\"29253589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not exclude MAM-localized CDS2 contributions to mitochondrial lipids\", \"Reconciliation with CDS2-dependent cardiolipin phenotypes not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connecting CDS2 to phosphoinositide pools demonstrated its physiological role in PI cycle recycling and in tuning VEGFA-driven endothelial behavior, moving the enzyme from a biosynthetic step to a signaling controller.\",\n      \"evidence\": \"Zebrafish and mouse knockouts with live imaging and PIP2/PIP3 quantification; isotope tracing with LC-MS showing arachidonoyl-PA routing to PI\",\n      \"pmids\": [\"31501519\", \"35712788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of arachidonoyl-PA species selection not defined\", \"How CDS2 is recruited to PLC-active sites unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining the lipid droplet phenotype showed CDS2 restrains LD growth through a CDS1-distinct, DGAT2/GPAT4-dependent route driven by PA accumulation, separating the two isoforms mechanistically.\",\n      \"evidence\": \"siRNA and CRISPR knockout with epistasis rescues (DGAT2/GPAT4 vs CIDEC), lipidomics, and fluorescence microscopy\",\n      \"pmids\": [\"26946540\", \"31548309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link between surface PA and DGAT2/GPAT4 recruitment not established\", \"Whether enzymatic activity per se or PA level drives LD effect not fully separated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Liver-specific loss tied CDS2 to mitochondria-associated membranes and mitochondrial PE homeostasis, explaining how its deficiency produces metabolic disease.\",\n      \"evidence\": \"Hepatocyte conditional knockout with mitochondrial fractionation, lipidomics, PISD-overexpression and PPARα-agonist rescue\",\n      \"pmids\": [\"36546079\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of CDS2 enrichment at MAMs unknown\", \"How ER CDP-DAG output feeds mitochondrial PE not mechanistically traced\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Quantitative tracing in macrophages distinguished CDS2's modest role in basal PI synthesis from its essential role in sustaining PI-cycle flux, refining where the enzyme is rate-limiting.\",\n      \"evidence\": \"CRISPR deletion with dual stable-isotope labeling, LC-MS lipidomics, GPCR-stimulated PLC assays, and calcium imaging\",\n      \"pmids\": [\"39312194\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Origin of the PLC-independent calcium homeostasis defect unexplained\", \"Whether CDS1 compensates basal synthesis not directly tested here\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Genome-scale screens established CDS1/CDS2 as a robust synthetic lethal pair, demonstrating that CDS2 catalytic activity becomes essential in low-CDS1 tumors and nominating it as a cancer target.\",\n      \"evidence\": \"Single-gene and paired CRISPR screens, catalytic-mutant and CDS1 re-expression rescues, lipidomics, apoptosis assays, and in vivo xenografts\",\n      \"pmids\": [\"40615675\", \"40615674\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for catalysis and potential inhibitor binding not defined\", \"Determinants of CDS1 silencing across tumor types not addressed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A proposed CDS2-MBOAT7 ER interaction introduces a candidate adaptive response coupling CDS2 loss to lipid droplet regulation, but this awaits peer-reviewed confirmation.\",\n      \"evidence\": \"Co-immunoprecipitation, confocal imaging, RAB1 manipulation, and LD assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.08.26.672501\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Reciprocal/structural validation of CDS2-MBOAT7 binding not shown\", \"Physiological significance of MBOAT7 relocalization unestablished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CDS2 is recruited and regulated at distinct membrane subdomains (PLC-active sites, lipid droplet contacts, MAMs) to channel specific PA species into different downstream lipids remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of substrate selection or activity regulation\", \"Mechanism of spatial targeting to subcompartments unknown\", \"Direct regulators of CDS2 activity (vs transcriptional control) uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 7, 10, 17]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 7, 13, 18]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 10, 14, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 15]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 16, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CDS1\", \"MBOAT7\", \"DGAT2\", \"GPAT4\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}