{"gene":"DGAT2","run_date":"2026-04-28T17:46:02","timeline":{"discoveries":[{"year":2001,"finding":"DGAT2 is a diacylglycerol acyltransferase that catalyzes the final step of triacylglycerol synthesis using fatty acyl-CoA and diacylglycerol as substrates; it has no sequence homology to DGAT1, is inhibited by high MgCl2 concentrations, and shows no activity toward acyl acceptors other than diacylglycerol.","method":"Expression in insect cells followed by membrane-based enzymatic assay with radiolabeled substrates; substrate specificity and inhibition kinetics","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic reconstitution with substrate specificity and inhibition characterization, foundational cloning paper with >600 citations","pmids":["11481335"],"is_preprint":false},{"year":2001,"finding":"DGAT2 defines a new gene family (originally identified from Mortierella ramanniana) unrelated to DGAT1/ACAT family, encoding enzymes with DGAT activity that co-purify with lipid bodies and have broad activity optimum between pH 6–8.","method":"Protein purification from fungal lipid bodies, partial peptide sequencing, cDNA cloning, heterologous expression in insect cells with DGAT activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — purification plus reconstitution, original discovery paper with >260 citations","pmids":["11481333"],"is_preprint":false},{"year":2003,"finding":"DGAT2 is required for survival in mice; DGAT2-deficient mice are lipopenic and die neonatally due to profound reductions in triglyceride substrates for energy metabolism and impaired skin permeability barrier function; DGAT1 cannot compensate for DGAT2 loss, indicating the two enzymes have fundamentally different roles in triglyceride metabolism.","method":"Gene knockout in mice; biochemical analysis of lipid content; histological analysis of skin barrier","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined lethal phenotype, multiple orthogonal readouts, >478 citations","pmids":["14668353"],"is_preprint":false},{"year":2004,"finding":"Niacin noncompetitively inhibits DGAT2 but not DGAT1 activity in HepG2 cells, decreasing apparent Vmax without changing Km, acting on overt (cytosolic-facing) DGAT activity.","method":"Microsomal DGAT activity assay with radiolabeled substrates, Lineweaver-Burk kinetic analysis, selective DGAT1/DGAT2 inhibition comparison","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro kinetic assay, but single lab, single method","pmids":["15258194"],"is_preprint":false},{"year":2006,"finding":"DGAT2 co-localizes with SCD1 in the ER as demonstrated by confocal microscopy, co-immunoprecipitation, and FRET, supporting substrate channeling of SCD1-produced monounsaturated fatty acids directly to DGAT2 for triglyceride synthesis.","method":"Co-immunoprecipitation, confocal colocalization, FRET in HeLa cells; subcellular fractionation of mouse liver","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 — three orthogonal methods (Co-IP, confocal, FRET) in same study demonstrating physical proximity","pmids":["16751624"],"is_preprint":false},{"year":2007,"finding":"Antisense oligonucleotide knockdown of DGAT2 (but not DGAT1) in diet-induced obese rats reverses hepatic steatosis and insulin resistance by reducing hepatic diacylglycerol content via decreased SREBP1c-mediated lipogenesis and increased fatty acid oxidation, placing DGAT2 downstream of SREBP1c in the hepatic de novo lipogenesis pathway.","method":"ASO-mediated knockdown in vivo, hepatic lipid quantification, gene expression analysis, hyperinsulinemic-euglycemic clamp, DAG/TG/LCFA-CoA measurement","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — in vivo KD with multiple orthogonal metabolic readouts and mechanistic pathway placement, >315 citations","pmids":["17526931"],"is_preprint":false},{"year":2008,"finding":"DGAT2 localizes to the ER under basal conditions, but after oleate stimulation also localizes near lipid droplet surfaces where it co-localizes with mitochondria; DGAT2 is present in mitochondria-associated membranes (MAM). The N-terminal 67 amino acids of DGAT2 (not conserved in family members) contain a positively charged mitochondrial targeting signal (residues 61–66) sufficient to direct a red fluorescent protein to mitochondria.","method":"Live-cell imaging, subcellular fractionation, biochemical MAM isolation, deletion mutagenesis with RFP fusion constructs in cultured cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — fractionation, live imaging, and mutagenesis with functional targeting readout in single study, >329 citations","pmids":["19049983"],"is_preprint":false},{"year":2014,"finding":"DGAT2 forms homodimers and is part of a ~650 kDa protein complex in membranes and on lipid droplets; DGAT2 physically interacts with MGAT2 (monoacylglycerol acyltransferase 2) via its two transmembrane domains. Co-expression of DGAT2 and MGAT2 increases TG storage above either enzyme alone, and MGAT2-derived DAG triggers DGAT2 translocation to lipid droplets.","method":"Chemical cross-linking (DSS), co-immunoprecipitation, in situ proximity ligation assay, deletion mutagenesis, colocalization, TG storage measurement in McArdle RH7777 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (crosslinking, Co-IP, PLA, mutagenesis) in single study establishing complex and functional consequence","pmids":["25164810"],"is_preprint":false},{"year":2016,"finding":"A missense mutation (p.Y223H) in DGAT2 causes autosomal-dominant axonal Charcot-Marie-Tooth disease; overexpression of the mutant DGAT2 inhibits proliferation of mouse motor neuron cells and inhibits axonal branching in zebrafish peripheral nervous system, indicating DGAT2 function in neuronal/axonal biology.","method":"Exome sequencing, overexpression of mutant DGAT2 in mouse motor neuron cells (proliferation assay), zebrafish axonal branching assay","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 — disease mutation with functional validation in two model systems, but single lab","pmids":["26786738"],"is_preprint":false},{"year":2018,"finding":"Imidazopyridine inhibitors (including PF-06424439) are slowly reversible, noncompetitive (with respect to acyl-CoA) time-dependent inhibitors of DGAT2 that engage via a two-step binding mechanism (EI→EI* isomerization). Mutagenesis of H161 and H163 dramatically reduces inhibitor binding, identifying these histidine residues as critical for the inhibitor binding site.","method":"Kinetic inhibition analysis, time-dependent inhibition assays, active-site mutagenesis (H161A, H163A), 125I-labeled radioligand binding assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzyme kinetics with mutagenesis and radioligand binding; rigorous mechanistic characterization","pmids":["30422629"],"is_preprint":false},{"year":2018,"finding":"In mouse hepatocytes and rodent models, DGAT2 inhibition reduces VLDL-TG secretion and hepatic lipid; DGAT2 primarily supports apoB particle number (VLDL secretion) and DGAT1 determines VLDL particle size/lipidation within the ER lumen; the two enzymes can largely compensate for each other for apoB secretion.","method":"Liver-specific DGAT1 knockout mice (Triton WR-1339 VLDL secretion assay), DGAT1/DGAT2-specific inhibitors in HepG2 cells, electron microscopy of ER lipid content, microsomal TAG/protein ratios","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO plus inhibitor studies with multiple biochemical readouts, mechanistic pathway placement for VLDL assembly","pmids":["30397187"],"is_preprint":false},{"year":2019,"finding":"In adipocytes, DGAT2 and DGAT1 can largely compensate for each other for TG storage; adipocyte-specific DGAT2 knockout mice have normal TG storage on chow or high-fat diet, while DGAT1 adipocyte-specific knockout causes reduced body fat and glucose intolerance on high-fat diet associated with ER stress activation.","method":"Adipocyte-specific conditional knockout mice, body composition measurement, metabolic testing (glucose tolerance, insulin tolerance), ER stress pathway analysis","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with defined cellular and metabolic phenotypes, comparison of both isoforms in same system","pmids":["30936184"],"is_preprint":false},{"year":2021,"finding":"DGAT2 stability is increased when DGAT1 is inhibited, suggesting a compensatory regulation of DGAT2 protein levels in response to DGAT1 loss. Endogenous DGAT2 protein was successfully detected by CRISPR/Cas9-mediated insertion of a 3×FLAG tag at the C-terminus in HepG2 cells.","method":"CRISPR/Cas9 knock-in epitope tagging of endogenous DGAT2, immunoblotting, DGAT1 inhibitor treatment","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 — endogenous protein detection via CRISPR knock-in, post-translational stability finding with functional implication, single lab","pmids":["34116261"],"is_preprint":false},{"year":2023,"finding":"DGAT2-synthesized TG is stored in larger lipid droplets whereas DGAT1-synthesized TG accumulates in smaller lipid droplets; adipose triglyceride lipase (ATGL) preferentially targets lipid droplets generated by DGAT1, and fatty acids from DGAT1-made TG are preferentially used for beta-oxidation.","method":"Individual DGAT1/DGAT2 inhibition in Huh7 hepatocytes, ATGL colocalization, fatty acid oxidation measurement, lipid droplet size quantification","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological inhibition with multiple orthogonal readouts, single lab","pmids":["37516308"],"is_preprint":false},{"year":2024,"finding":"Rab1b GTPase promotes DGAT2 redistribution from the ER to lipid droplet surfaces (demonstrated by FRET between DGAT2 and Rab1b and activity mutants); DAG recruits DGAT2 to lipid droplets in vitro. In Warburg Micro syndrome model mouse fibroblasts, mutations in the Rab1b-GAP TBC1D20 alter LD metabolism consistent with Rab1b activity on DGAT2.","method":"FRET between DGAT2 and Rab1b activity mutants, dominant-negative Rab1b overexpression, LD formation assay, in vitro DAG recruitment assay, Warburg Micro syndrome mouse fibroblast model","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 — FRET plus functional mutant analysis plus disease model, single lab","pmids":["38809969"],"is_preprint":false},{"year":2025,"finding":"ATG2A transfers DAG from the ER to lipid droplets and this DAG transfer recruits DGAT2 to the LD surface for TAG synthesis and LD expansion; in ATG2A deficiency, DGAT2 fails to relocate to LDs. In vitro, DAG directly recruits DGAT2 to LDs. ATG2A and DGAT2 act synergistically for LD growth.","method":"ATG2A knockdown/knockout, in vitro lipid transfer reconstitution, DAG-mediated DGAT2 recruitment to artificial LDs, DGAT2 inhibitor studies, live-cell imaging","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution plus cell biology KO plus mechanistic pathway placement in high-impact journal","pmids":["41249819"],"is_preprint":false},{"year":2025,"finding":"Amyloid-β exposure induces DGAT2-dependent lipid droplet formation in microglia, converting free fatty acids to triacylglycerols; DGAT2 expression is increased in 5xFAD mouse and human AD brains. Pharmacological DGAT2 inhibition improves microglial Aβ phagocytosis and reduces plaque load and neuronal damage in 5xFAD mice.","method":"Lipidomic analysis of Aβ-treated microglia, DGAT2 KO/pharmacological inhibition, Aβ phagocytosis assay, plaque load quantification in 5xFAD mouse model","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (lipidomics, KO, pharmacological inhibition, in vivo plaque quantification) in single study","pmids":["40393454"],"is_preprint":false},{"year":2010,"finding":"Chronic alcohol feeding upregulates DGAT2 gene and protein expression in liver via suppression of MEK/ERK1/2 signaling, and this is mechanistically linked through disrupted methionine metabolism (reduced SAM/SAH ratio); restoring SAM/SAH with betaine supplementation alleviates ERK1/2 inhibition and attenuates DGAT2 upregulation.","method":"In vivo alcohol feeding model, MEK/ERK inhibitor treatment in HepG2 cells, betaine supplementation, gene expression analysis, TG quantification","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro and in vivo concordant data with pharmacological pathway dissection, single lab","pmids":["20739640"],"is_preprint":false},{"year":2014,"finding":"FAAH overexpression inhibits DGAT2 expression and TG synthesis; a loss-of-function FAAH variant (R315I) eliminates this inhibitory effect, demonstrating that FAAH functions upstream of DGAT2 to regulate TG biosynthesis.","method":"In vitro overexpression of FAAH and DGAT2 in cell lines, TG synthesis assay, exome sequencing plus functional validation of FAAH R315I mutation","journal":"Endocrine","confidence":"Medium","confidence_rationale":"Tier 2 — functional epistasis established in vitro with disease mutation validation, single lab","pmids":["28243972"],"is_preprint":false},{"year":2004,"finding":"DGAT2 mRNA expression in white adipose tissue is regulated by central leptin action; intracerebroventricular leptin infusion reduces DGAT2 expression in WAT of IRS-2-deficient and ob/ob mice independently of DGAT1, placing DGAT2 downstream of central leptin/IRS-2 signaling in adipose triglyceride metabolism.","method":"IRS-2 KO and ob/ob mouse models, intracerebroventricular leptin infusion, RT-PCR for DGAT1/DGAT2 mRNA, 3T3-L1 adipocyte hypertrophy model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo pharmacological manipulation with pathway placement, single lab","pmids":["15550388"],"is_preprint":false}],"current_model":"DGAT2 is an integral ER membrane enzyme that catalyzes the final committed step of triacylglycerol synthesis by acylating diacylglycerol with fatty acyl-CoA; it localizes to the ER under basal conditions and redistributes to lipid droplet surfaces upon fatty acid loading via DAG-mediated recruitment facilitated by ATG2A and Rab1b, where it forms a ~650 kDa complex including MGAT2 to channel substrates for TG synthesis; its N-terminal mitochondrial targeting signal also directs it to mitochondria-associated membranes, and it is regulated upstream by SREBP1c-mediated lipogenesis, central leptin/IRS-2 signaling, MEK/ERK signaling, and FAAH."},"narrative":{"teleology":[{"year":2001,"claim":"Identifying DGAT2 as a novel acyltransferase unrelated to DGAT1 established that mammals possess two mechanistically independent enzymes for the terminal step of TG synthesis.","evidence":"Heterologous expression in insect cells with radiolabeled substrate assays and kinetic characterization; independent purification from fungal lipid bodies with cDNA cloning","pmids":["11481335","11481333"],"confidence":"High","gaps":["No structural information on the active site","Substrate channeling mechanism unknown","Relative contributions of DGAT1 vs DGAT2 in vivo undefined"]},{"year":2003,"claim":"Demonstrating that DGAT2 knockout is neonatally lethal while DGAT1 knockout is not revealed that the two DGAT enzymes have non-redundant physiological roles, with DGAT2 essential for skin barrier lipids and systemic TG homeostasis.","evidence":"Germline knockout mice with lipid quantification, histological analysis of skin barrier, and metabolic profiling","pmids":["14668353"],"confidence":"High","gaps":["Whether DGAT2 essentiality is tissue-specific was unclear","Mechanism of skin barrier lipid dependence on DGAT2 unresolved"]},{"year":2006,"claim":"Discovery that DGAT2 physically interacts with SCD1 in the ER via co-IP and FRET established a substrate channeling model in which monounsaturated fatty acids produced by SCD1 are directly funneled to DGAT2 for TG synthesis.","evidence":"Co-immunoprecipitation, confocal colocalization, and FRET in HeLa cells; subcellular fractionation of mouse liver","pmids":["16751624"],"confidence":"High","gaps":["Stoichiometry and structural basis of SCD1–DGAT2 interaction unknown","Whether channeling is obligatory or modulatory not resolved"]},{"year":2007,"claim":"ASO knockdown of DGAT2 in obese rats reversed hepatic steatosis and insulin resistance, placing DGAT2 downstream of SREBP1c in de novo lipogenesis and demonstrating its pathophysiological role in fatty liver disease.","evidence":"In vivo ASO knockdown with hyperinsulinemic-euglycemic clamp, hepatic DAG/TG quantification, and gene expression analysis","pmids":["17526931"],"confidence":"High","gaps":["Direct transcriptional regulation of DGAT2 by SREBP1c not shown at the promoter level","Relative contribution of reduced TG synthesis vs increased oxidation to phenotype unclear"]},{"year":2008,"claim":"Identifying that DGAT2 redistributes from the ER to lipid droplet–mitochondria contact sites upon oleate loading, and that its unique N-terminal mitochondrial targeting signal mediates MAM localization, revealed how DGAT2 accesses different membrane compartments for TG synthesis.","evidence":"Live-cell imaging, subcellular fractionation, MAM isolation, and deletion mutagenesis with RFP fusions","pmids":["19049983"],"confidence":"High","gaps":["Functional consequence of mitochondrial targeting for TG metabolism not established","Signal for return to ER not identified"]},{"year":2014,"claim":"Discovery that DGAT2 forms homodimers within a ~650 kDa complex containing MGAT2, and that MGAT2-derived DAG triggers DGAT2 translocation to lipid droplets, established a substrate-channeling complex that couples sequential acylation reactions on LD surfaces.","evidence":"Chemical cross-linking, co-IP, proximity ligation assay, deletion mutagenesis, and TG storage assays in McArdle RH7777 cells","pmids":["25164810"],"confidence":"High","gaps":["Full composition of the ~650 kDa complex not determined","Whether MGAT2–DGAT2 coupling is obligatory for LD-directed TG synthesis unknown"]},{"year":2016,"claim":"Identification of a dominantly acting DGAT2 p.Y223H mutation causing axonal Charcot-Marie-Tooth disease extended DGAT2's functional significance beyond lipid storage to neuronal/axonal biology.","evidence":"Exome sequencing, overexpression in mouse motor neuron cells (proliferation assay), zebrafish axonal branching assay","pmids":["26786738"],"confidence":"Medium","gaps":["Mechanism by which DGAT2 mutation impairs axonal branching unknown","Whether enzymatic activity or an alternative function is affected not determined","Single family reported"]},{"year":2018,"claim":"Detailed kinetic characterization of DGAT2 inhibitors revealed a two-step slow-onset inhibition mechanism and identified H161/H163 as critical residues for inhibitor binding, providing the first active-site mapping of the enzyme.","evidence":"Time-dependent inhibition kinetics, radioligand binding, site-directed mutagenesis of H161A and H163A","pmids":["30422629"],"confidence":"High","gaps":["No crystal or cryo-EM structure of DGAT2","Whether H161/H163 are catalytic residues or only inhibitor-binding residues not resolved"]},{"year":2018,"claim":"Delineating that DGAT2 primarily supports VLDL particle number while DGAT1 determines VLDL particle size established distinct roles for the two enzymes in hepatic lipoprotein assembly.","evidence":"Liver-specific DGAT1 KO mice, DGAT1/DGAT2-specific inhibitors in HepG2 cells, VLDL secretion assays, electron microscopy","pmids":["30397187"],"confidence":"High","gaps":["Whether DGAT2 directly lipidates apoB or acts indirectly via ER TG pools not determined","Mechanism of functional compensation between DGAT1 and DGAT2 for apoB secretion unknown"]},{"year":2023,"claim":"Showing that DGAT2-synthesized TG preferentially populates larger lipid droplets while DGAT1-synthesized TG goes to smaller, ATGL-accessible droplets defined distinct metabolic fates for TG produced by each enzyme.","evidence":"Selective pharmacological inhibition of DGAT1/DGAT2 in Huh7 cells, LD size quantification, ATGL colocalization, fatty acid oxidation measurement","pmids":["37516308"],"confidence":"Medium","gaps":["Mechanism determining LD size specificity unknown","Whether this reflects ER subdomain localization or LD surface targeting not resolved"]},{"year":2024,"claim":"Identification of Rab1b as a GTPase promoting DGAT2 redistribution from ER to lipid droplets, with disease relevance via the Rab1b-GAP TBC1D20 in Warburg Micro syndrome, revealed a GTPase-regulated trafficking step in DGAT2 targeting.","evidence":"FRET between DGAT2 and Rab1b activity mutants, dominant-negative Rab1b, in vitro DAG recruitment assay, Warburg Micro syndrome mouse fibroblasts","pmids":["38809969"],"confidence":"Medium","gaps":["Direct physical interaction between Rab1b and DGAT2 not confirmed by reciprocal pull-down","Whether Rab1b acts on DGAT2 directly or via membrane remodeling not established"]},{"year":2025,"claim":"Reconstitution of ATG2A-mediated DAG transfer from ER to lipid droplets as the upstream signal recruiting DGAT2 to LDs unified the DAG-sensing, ER-to-LD relocalization, and LD expansion mechanisms into a single pathway.","evidence":"In vitro lipid transfer reconstitution, ATG2A KO/KD, DAG-mediated DGAT2 recruitment to artificial LDs, live-cell imaging","pmids":["41249819"],"confidence":"High","gaps":["DAG-binding domain on DGAT2 not mapped","Whether other lipid transfer proteins can substitute for ATG2A unknown"]},{"year":2025,"claim":"Demonstration that amyloid-β induces DGAT2-dependent lipid droplet accumulation in microglia and that DGAT2 inhibition restores Aβ phagocytosis and reduces plaque burden established DGAT2 as a pathogenic mediator in Alzheimer's disease neuroinflammation.","evidence":"Lipidomics of Aβ-treated microglia, DGAT2 KO and pharmacological inhibition, phagocytosis assay, 5xFAD mouse model with plaque quantification","pmids":["40393454"],"confidence":"High","gaps":["Whether DGAT2 inhibition affects microglial polarization beyond LD metabolism not determined","Long-term cognitive outcomes of DGAT2 inhibition not assessed"]},{"year":null,"claim":"No high-resolution structure of DGAT2 exists; the catalytic mechanism, the DAG-sensing domain mediating LD recruitment, the basis for DGAT1/DGAT2 non-redundancy at the structural level, and the mechanism linking DGAT2 to axonal integrity remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure available","DAG-binding site on DGAT2 not mapped","Molecular basis of axonal CMT phenotype completely unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[6,14,15]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,6]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[6,7,14,15]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[6]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,2,5,7,10,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[14,19]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,16]}],"complexes":["DGAT2–MGAT2 ~650 kDa complex"],"partners":["SCD1","MGAT2","RAB1B","ATG2A","TBC1D20","FAAH"],"other_free_text":[]},"mechanistic_narrative":"DGAT2 is an ER-resident diacylglycerol acyltransferase that catalyzes the final committed step of triacylglycerol (TG) biosynthesis, transferring a fatty acyl group from acyl-CoA to diacylglycerol, and is essential for mammalian survival as demonstrated by neonatal lethality of DGAT2-null mice due to lipopenia and skin barrier failure [PMID:11481335, PMID:14668353]. Under lipid-loading conditions, DAG generated by ATG2A-mediated lipid transfer and MGAT2 activity recruits DGAT2 from the ER to lipid droplet surfaces, where it forms a ~650 kDa complex with MGAT2 and channels substrates for TG storage into large lipid droplets; this relocalization is further promoted by the GTPase Rab1b [PMID:25164810, PMID:41249819, PMID:38809969]. DGAT2 also physically interacts with SCD1 in the ER to channel monounsaturated fatty acids into TG, and its expression is regulated by SREBP1c-mediated lipogenesis and MEK/ERK signaling [PMID:16751624, PMID:17526931, PMID:20739640]. A missense mutation (p.Y223H) in DGAT2 causes autosomal-dominant axonal Charcot-Marie-Tooth disease [PMID:26786738]."},"prefetch_data":{"uniprot":{"accession":"Q96PD7","full_name":"Diacylglycerol O-acyltransferase 2","aliases":["Acyl-CoA retinol O-fatty-acyltransferase","ARAT","Retinol O-fatty-acyltransferase","Diglyceride acyltransferase 2"],"length_aa":388,"mass_kda":43.8,"function":"Essential acyltransferase that catalyzes the terminal and only committed step in triacylglycerol synthesis by using diacylglycerol and fatty acyl CoA as substrates. Required for synthesis and storage of intracellular triglycerides (PubMed:27184406). Probably plays a central role in cytosolic lipid accumulation. In liver, is primarily responsible for incorporating endogenously synthesized fatty acids into triglycerides (By similarity). Also functions as an acyl-CoA retinol acyltransferase (ARAT) (By similarity). Also able to use 1-monoalkylglycerol (1-MAkG) as an acyl acceptor for the synthesis of monoalkyl-monoacylglycerol (MAMAG) (PubMed:28420705)","subcellular_location":"Endoplasmic reticulum membrane; Lipid droplet; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/Q96PD7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DGAT2","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DGAT2","total_profiled":1310},"omim":[{"mim_id":"621380","title":"TRANSMEMBRANE PROTEIN 68; TMEM68","url":"https://www.omim.org/entry/621380"},{"mim_id":"611814","title":"ELONGATION OF VERY LONG CHAIN FATTY ACIDS-LIKE 2; ELOVL2","url":"https://www.omim.org/entry/611814"},{"mim_id":"610270","title":"MONOACYLGLYCEROL O-ACYLTRANSFERASE 2; MOGAT2","url":"https://www.omim.org/entry/610270"},{"mim_id":"610268","title":"MONOACYLGLYCEROL O-ACYLTRANSFERASE 1; MOGAT1","url":"https://www.omim.org/entry/610268"},{"mim_id":"610184","title":"MONOACYLGLYCEROL O-ACYLTRANSFERASE 3; MOGAT3","url":"https://www.omim.org/entry/610184"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":447.0},{"tissue":"breast","ntpm":135.2},{"tissue":"liver","ntpm":309.8},{"tissue":"skin 1","ntpm":147.4}],"url":"https://www.proteinatlas.org/search/DGAT2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q96PD7","domains":[{"cath_id":"3.40.1130","chopping":"83-386","consensus_level":"high","plddt":95.278,"start":83,"end":386}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PD7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PD7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96PD7-F1-predicted_aligned_error_v6.png","plddt_mean":88.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DGAT2","jax_strain_url":"https://www.jax.org/strain/search?query=DGAT2"},"sequence":{"accession":"Q96PD7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96PD7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96PD7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96PD7"}},"corpus_meta":[{"pmid":"11481335","id":"PMC_11481335","title":"Cloning of DGAT2, a second mammalian diacylglycerol acyltransferase, and related family members.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11481335","citation_count":613,"is_preprint":false},{"pmid":"14668353","id":"PMC_14668353","title":"Lipopenia and skin barrier abnormalities in DGAT2-deficient mice.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14668353","citation_count":478,"is_preprint":false},{"pmid":"16920778","id":"PMC_16920778","title":"Tung tree DGAT1 and DGAT2 have nonredundant functions in triacylglycerol biosynthesis and are localized to different subdomains of the endoplasmic reticulum.","date":"2006","source":"The Plant cell","url":"https://pubmed.ncbi.nlm.nih.gov/16920778","citation_count":392,"is_preprint":false},{"pmid":"19049983","id":"PMC_19049983","title":"The endoplasmic reticulum enzyme DGAT2 is found in mitochondria-associated membranes and has a mitochondrial targeting signal that promotes its 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red cattle].","date":"2008","source":"Yi chuan = Hereditas","url":"https://pubmed.ncbi.nlm.nih.gov/18332002","citation_count":4,"is_preprint":false},{"pmid":"22919314","id":"PMC_22919314","title":"FAD2-DGAT2 genes coexpressed in endophytic Aspergillus fumigatus derived from tung oilseeds.","date":"2012","source":"TheScientificWorldJournal","url":"https://pubmed.ncbi.nlm.nih.gov/22919314","citation_count":4,"is_preprint":false},{"pmid":"30928362","id":"PMC_30928362","title":"Identification and function analysis of a type 2 diacylglycerol acyltransferase (DGAT2) from the endosperm of coconut (Cocos nucifera L.).","date":"2019","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/30928362","citation_count":3,"is_preprint":false},{"pmid":"36187813","id":"PMC_36187813","title":"Corrigendum: Expression of DGAT2 gene and its associations with intramuscular fat content and breast muscle fiber characteristics in domestic pigeons (Columba livia).","date":"2022","source":"Frontiers in veterinary science","url":"https://pubmed.ncbi.nlm.nih.gov/36187813","citation_count":3,"is_preprint":false},{"pmid":"40694426","id":"PMC_40694426","title":"DGAT2 reduction and lipid dysregulation drive psoriasis development in keratinocyte-specific SPRY1-deficient mice.","date":"2025","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/40694426","citation_count":2,"is_preprint":false},{"pmid":"30697667","id":"PMC_30697667","title":"The Amphibian Diacylglycerol O-acyltransferase 2 (DGAT2): a 'paleo-protein' with Conserved Function but Unique Folding.","date":"2019","source":"The protein journal","url":"https://pubmed.ncbi.nlm.nih.gov/30697667","citation_count":2,"is_preprint":false},{"pmid":"17681922","id":"PMC_17681922","title":"[Polymorphisms of DGAT2 gene and its associations with several growth traits in Nanyang cattle].","date":"2007","source":"Yi chuan = Hereditas","url":"https://pubmed.ncbi.nlm.nih.gov/17681922","citation_count":2,"is_preprint":false},{"pmid":"34901200","id":"PMC_34901200","title":"DGAT2-MOGAT2 SNPs and Gene-Environment Interactions on Serum Lipid Profiles and the Risk of Ischemic Stroke.","date":"2021","source":"Frontiers in cardiovascular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34901200","citation_count":2,"is_preprint":false},{"pmid":"38644620","id":"PMC_38644620","title":"DGAT2 Plays a Crucial Role to Control ESRRA-PROX1 Transcriptional Network to Maintain Hepatic Mitochondrial Sustainability.","date":"2024","source":"Diabetes & metabolism journal","url":"https://pubmed.ncbi.nlm.nih.gov/38644620","citation_count":2,"is_preprint":false},{"pmid":"41832772","id":"PMC_41832772","title":"Regulation of Lipid Dysmetabolism and Neuroinflammation Progression Linked With Alzheimer's Disease Through Modulation of Dgat2.","date":"2026","source":"Aging cell","url":"https://pubmed.ncbi.nlm.nih.gov/41832772","citation_count":1,"is_preprint":false},{"pmid":"35866640","id":"PMC_35866640","title":"The Postnatal Resolution of Developmental Toxicity Induced by Pharmacological Diacylglycerol Acyltransferase 2 (DGAT2) Inhibition During Gestation in Rats.","date":"2022","source":"Toxicological sciences : an official journal of the Society of Toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/35866640","citation_count":1,"is_preprint":false},{"pmid":"41096982","id":"PMC_41096982","title":"miR-10c Targets dgat2 and Affects the Expression of Genes Involved in Fatty Acid and Triglyceride Metabolism in Oreochromis niloticus Under Heat Stress.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41096982","citation_count":1,"is_preprint":false},{"pmid":"18331995","id":"PMC_18331995","title":"[Research progress on diacylgycerol acyltransferase 2 (DGAT2) gene].","date":"2008","source":"Yi chuan = Hereditas","url":"https://pubmed.ncbi.nlm.nih.gov/18331995","citation_count":0,"is_preprint":false},{"pmid":"41814114","id":"PMC_41814114","title":"Inflammation promotes hepatic but not adipose tissue DGAT2 expression and triglyceride synthesis in MAFLD mice.","date":"2026","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/41814114","citation_count":0,"is_preprint":false},{"pmid":"40996355","id":"PMC_40996355","title":"Effect of Varying Degrees of Hepatic Impairment on the Pharmacokinetics of Ervogastat, a Diacylglycerol Acyltransferase 2 (DGAT2) Inhibitor, and Clesacostat, an Acetyl-CoA Carboxylase (ACC) Inhibitor.","date":"2025","source":"Journal of clinical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40996355","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52981,"output_tokens":5002,"usd":0.116986},"stage2":{"model":"claude-opus-4-6","input_tokens":8515,"output_tokens":3387,"usd":0.190875},"total_usd":0.307861,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"DGAT2 is a diacylglycerol acyltransferase that catalyzes the final step of triacylglycerol synthesis using fatty acyl-CoA and diacylglycerol as substrates; it has no sequence homology to DGAT1, is inhibited by high MgCl2 concentrations, and shows no activity toward acyl acceptors other than diacylglycerol.\",\n      \"method\": \"Expression in insect cells followed by membrane-based enzymatic assay with radiolabeled substrates; substrate specificity and inhibition kinetics\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic reconstitution with substrate specificity and inhibition characterization, foundational cloning paper with >600 citations\",\n      \"pmids\": [\"11481335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"DGAT2 defines a new gene family (originally identified from Mortierella ramanniana) unrelated to DGAT1/ACAT family, encoding enzymes with DGAT activity that co-purify with lipid bodies and have broad activity optimum between pH 6–8.\",\n      \"method\": \"Protein purification from fungal lipid bodies, partial peptide sequencing, cDNA cloning, heterologous expression in insect cells with DGAT activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purification plus reconstitution, original discovery paper with >260 citations\",\n      \"pmids\": [\"11481333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"DGAT2 is required for survival in mice; DGAT2-deficient mice are lipopenic and die neonatally due to profound reductions in triglyceride substrates for energy metabolism and impaired skin permeability barrier function; DGAT1 cannot compensate for DGAT2 loss, indicating the two enzymes have fundamentally different roles in triglyceride metabolism.\",\n      \"method\": \"Gene knockout in mice; biochemical analysis of lipid content; histological analysis of skin barrier\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined lethal phenotype, multiple orthogonal readouts, >478 citations\",\n      \"pmids\": [\"14668353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Niacin noncompetitively inhibits DGAT2 but not DGAT1 activity in HepG2 cells, decreasing apparent Vmax without changing Km, acting on overt (cytosolic-facing) DGAT activity.\",\n      \"method\": \"Microsomal DGAT activity assay with radiolabeled substrates, Lineweaver-Burk kinetic analysis, selective DGAT1/DGAT2 inhibition comparison\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinetic assay, but single lab, single method\",\n      \"pmids\": [\"15258194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DGAT2 co-localizes with SCD1 in the ER as demonstrated by confocal microscopy, co-immunoprecipitation, and FRET, supporting substrate channeling of SCD1-produced monounsaturated fatty acids directly to DGAT2 for triglyceride synthesis.\",\n      \"method\": \"Co-immunoprecipitation, confocal colocalization, FRET in HeLa cells; subcellular fractionation of mouse liver\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — three orthogonal methods (Co-IP, confocal, FRET) in same study demonstrating physical proximity\",\n      \"pmids\": [\"16751624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Antisense oligonucleotide knockdown of DGAT2 (but not DGAT1) in diet-induced obese rats reverses hepatic steatosis and insulin resistance by reducing hepatic diacylglycerol content via decreased SREBP1c-mediated lipogenesis and increased fatty acid oxidation, placing DGAT2 downstream of SREBP1c in the hepatic de novo lipogenesis pathway.\",\n      \"method\": \"ASO-mediated knockdown in vivo, hepatic lipid quantification, gene expression analysis, hyperinsulinemic-euglycemic clamp, DAG/TG/LCFA-CoA measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KD with multiple orthogonal metabolic readouts and mechanistic pathway placement, >315 citations\",\n      \"pmids\": [\"17526931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DGAT2 localizes to the ER under basal conditions, but after oleate stimulation also localizes near lipid droplet surfaces where it co-localizes with mitochondria; DGAT2 is present in mitochondria-associated membranes (MAM). The N-terminal 67 amino acids of DGAT2 (not conserved in family members) contain a positively charged mitochondrial targeting signal (residues 61–66) sufficient to direct a red fluorescent protein to mitochondria.\",\n      \"method\": \"Live-cell imaging, subcellular fractionation, biochemical MAM isolation, deletion mutagenesis with RFP fusion constructs in cultured cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — fractionation, live imaging, and mutagenesis with functional targeting readout in single study, >329 citations\",\n      \"pmids\": [\"19049983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DGAT2 forms homodimers and is part of a ~650 kDa protein complex in membranes and on lipid droplets; DGAT2 physically interacts with MGAT2 (monoacylglycerol acyltransferase 2) via its two transmembrane domains. Co-expression of DGAT2 and MGAT2 increases TG storage above either enzyme alone, and MGAT2-derived DAG triggers DGAT2 translocation to lipid droplets.\",\n      \"method\": \"Chemical cross-linking (DSS), co-immunoprecipitation, in situ proximity ligation assay, deletion mutagenesis, colocalization, TG storage measurement in McArdle RH7777 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (crosslinking, Co-IP, PLA, mutagenesis) in single study establishing complex and functional consequence\",\n      \"pmids\": [\"25164810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A missense mutation (p.Y223H) in DGAT2 causes autosomal-dominant axonal Charcot-Marie-Tooth disease; overexpression of the mutant DGAT2 inhibits proliferation of mouse motor neuron cells and inhibits axonal branching in zebrafish peripheral nervous system, indicating DGAT2 function in neuronal/axonal biology.\",\n      \"method\": \"Exome sequencing, overexpression of mutant DGAT2 in mouse motor neuron cells (proliferation assay), zebrafish axonal branching assay\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — disease mutation with functional validation in two model systems, but single lab\",\n      \"pmids\": [\"26786738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Imidazopyridine inhibitors (including PF-06424439) are slowly reversible, noncompetitive (with respect to acyl-CoA) time-dependent inhibitors of DGAT2 that engage via a two-step binding mechanism (EI→EI* isomerization). Mutagenesis of H161 and H163 dramatically reduces inhibitor binding, identifying these histidine residues as critical for the inhibitor binding site.\",\n      \"method\": \"Kinetic inhibition analysis, time-dependent inhibition assays, active-site mutagenesis (H161A, H163A), 125I-labeled radioligand binding assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzyme kinetics with mutagenesis and radioligand binding; rigorous mechanistic characterization\",\n      \"pmids\": [\"30422629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In mouse hepatocytes and rodent models, DGAT2 inhibition reduces VLDL-TG secretion and hepatic lipid; DGAT2 primarily supports apoB particle number (VLDL secretion) and DGAT1 determines VLDL particle size/lipidation within the ER lumen; the two enzymes can largely compensate for each other for apoB secretion.\",\n      \"method\": \"Liver-specific DGAT1 knockout mice (Triton WR-1339 VLDL secretion assay), DGAT1/DGAT2-specific inhibitors in HepG2 cells, electron microscopy of ER lipid content, microsomal TAG/protein ratios\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO plus inhibitor studies with multiple biochemical readouts, mechanistic pathway placement for VLDL assembly\",\n      \"pmids\": [\"30397187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In adipocytes, DGAT2 and DGAT1 can largely compensate for each other for TG storage; adipocyte-specific DGAT2 knockout mice have normal TG storage on chow or high-fat diet, while DGAT1 adipocyte-specific knockout causes reduced body fat and glucose intolerance on high-fat diet associated with ER stress activation.\",\n      \"method\": \"Adipocyte-specific conditional knockout mice, body composition measurement, metabolic testing (glucose tolerance, insulin tolerance), ER stress pathway analysis\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular and metabolic phenotypes, comparison of both isoforms in same system\",\n      \"pmids\": [\"30936184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DGAT2 stability is increased when DGAT1 is inhibited, suggesting a compensatory regulation of DGAT2 protein levels in response to DGAT1 loss. Endogenous DGAT2 protein was successfully detected by CRISPR/Cas9-mediated insertion of a 3×FLAG tag at the C-terminus in HepG2 cells.\",\n      \"method\": \"CRISPR/Cas9 knock-in epitope tagging of endogenous DGAT2, immunoblotting, DGAT1 inhibitor treatment\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — endogenous protein detection via CRISPR knock-in, post-translational stability finding with functional implication, single lab\",\n      \"pmids\": [\"34116261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DGAT2-synthesized TG is stored in larger lipid droplets whereas DGAT1-synthesized TG accumulates in smaller lipid droplets; adipose triglyceride lipase (ATGL) preferentially targets lipid droplets generated by DGAT1, and fatty acids from DGAT1-made TG are preferentially used for beta-oxidation.\",\n      \"method\": \"Individual DGAT1/DGAT2 inhibition in Huh7 hepatocytes, ATGL colocalization, fatty acid oxidation measurement, lipid droplet size quantification\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological inhibition with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"37516308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Rab1b GTPase promotes DGAT2 redistribution from the ER to lipid droplet surfaces (demonstrated by FRET between DGAT2 and Rab1b and activity mutants); DAG recruits DGAT2 to lipid droplets in vitro. In Warburg Micro syndrome model mouse fibroblasts, mutations in the Rab1b-GAP TBC1D20 alter LD metabolism consistent with Rab1b activity on DGAT2.\",\n      \"method\": \"FRET between DGAT2 and Rab1b activity mutants, dominant-negative Rab1b overexpression, LD formation assay, in vitro DAG recruitment assay, Warburg Micro syndrome mouse fibroblast model\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FRET plus functional mutant analysis plus disease model, single lab\",\n      \"pmids\": [\"38809969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATG2A transfers DAG from the ER to lipid droplets and this DAG transfer recruits DGAT2 to the LD surface for TAG synthesis and LD expansion; in ATG2A deficiency, DGAT2 fails to relocate to LDs. In vitro, DAG directly recruits DGAT2 to LDs. ATG2A and DGAT2 act synergistically for LD growth.\",\n      \"method\": \"ATG2A knockdown/knockout, in vitro lipid transfer reconstitution, DAG-mediated DGAT2 recruitment to artificial LDs, DGAT2 inhibitor studies, live-cell imaging\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution plus cell biology KO plus mechanistic pathway placement in high-impact journal\",\n      \"pmids\": [\"41249819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Amyloid-β exposure induces DGAT2-dependent lipid droplet formation in microglia, converting free fatty acids to triacylglycerols; DGAT2 expression is increased in 5xFAD mouse and human AD brains. Pharmacological DGAT2 inhibition improves microglial Aβ phagocytosis and reduces plaque load and neuronal damage in 5xFAD mice.\",\n      \"method\": \"Lipidomic analysis of Aβ-treated microglia, DGAT2 KO/pharmacological inhibition, Aβ phagocytosis assay, plaque load quantification in 5xFAD mouse model\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (lipidomics, KO, pharmacological inhibition, in vivo plaque quantification) in single study\",\n      \"pmids\": [\"40393454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Chronic alcohol feeding upregulates DGAT2 gene and protein expression in liver via suppression of MEK/ERK1/2 signaling, and this is mechanistically linked through disrupted methionine metabolism (reduced SAM/SAH ratio); restoring SAM/SAH with betaine supplementation alleviates ERK1/2 inhibition and attenuates DGAT2 upregulation.\",\n      \"method\": \"In vivo alcohol feeding model, MEK/ERK inhibitor treatment in HepG2 cells, betaine supplementation, gene expression analysis, TG quantification\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro and in vivo concordant data with pharmacological pathway dissection, single lab\",\n      \"pmids\": [\"20739640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FAAH overexpression inhibits DGAT2 expression and TG synthesis; a loss-of-function FAAH variant (R315I) eliminates this inhibitory effect, demonstrating that FAAH functions upstream of DGAT2 to regulate TG biosynthesis.\",\n      \"method\": \"In vitro overexpression of FAAH and DGAT2 in cell lines, TG synthesis assay, exome sequencing plus functional validation of FAAH R315I mutation\",\n      \"journal\": \"Endocrine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional epistasis established in vitro with disease mutation validation, single lab\",\n      \"pmids\": [\"28243972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DGAT2 mRNA expression in white adipose tissue is regulated by central leptin action; intracerebroventricular leptin infusion reduces DGAT2 expression in WAT of IRS-2-deficient and ob/ob mice independently of DGAT1, placing DGAT2 downstream of central leptin/IRS-2 signaling in adipose triglyceride metabolism.\",\n      \"method\": \"IRS-2 KO and ob/ob mouse models, intracerebroventricular leptin infusion, RT-PCR for DGAT1/DGAT2 mRNA, 3T3-L1 adipocyte hypertrophy model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo pharmacological manipulation with pathway placement, single lab\",\n      \"pmids\": [\"15550388\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DGAT2 is an integral ER membrane enzyme that catalyzes the final committed step of triacylglycerol synthesis by acylating diacylglycerol with fatty acyl-CoA; it localizes to the ER under basal conditions and redistributes to lipid droplet surfaces upon fatty acid loading via DAG-mediated recruitment facilitated by ATG2A and Rab1b, where it forms a ~650 kDa complex including MGAT2 to channel substrates for TG synthesis; its N-terminal mitochondrial targeting signal also directs it to mitochondria-associated membranes, and it is regulated upstream by SREBP1c-mediated lipogenesis, central leptin/IRS-2 signaling, MEK/ERK signaling, and FAAH.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DGAT2 is an ER-resident diacylglycerol acyltransferase that catalyzes the final committed step of triacylglycerol (TG) biosynthesis, transferring a fatty acyl group from acyl-CoA to diacylglycerol, and is essential for mammalian survival as demonstrated by neonatal lethality of DGAT2-null mice due to lipopenia and skin barrier failure [PMID:11481335, PMID:14668353]. Under lipid-loading conditions, DAG generated by ATG2A-mediated lipid transfer and MGAT2 activity recruits DGAT2 from the ER to lipid droplet surfaces, where it forms a ~650 kDa complex with MGAT2 and channels substrates for TG storage into large lipid droplets; this relocalization is further promoted by the GTPase Rab1b [PMID:25164810, PMID:41249819, PMID:38809969]. DGAT2 also physically interacts with SCD1 in the ER to channel monounsaturated fatty acids into TG, and its expression is regulated by SREBP1c-mediated lipogenesis and MEK/ERK signaling [PMID:16751624, PMID:17526931, PMID:20739640]. A missense mutation (p.Y223H) in DGAT2 causes autosomal-dominant axonal Charcot-Marie-Tooth disease [PMID:26786738].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identifying DGAT2 as a novel acyltransferase unrelated to DGAT1 established that mammals possess two mechanistically independent enzymes for the terminal step of TG synthesis.\",\n      \"evidence\": \"Heterologous expression in insect cells with radiolabeled substrate assays and kinetic characterization; independent purification from fungal lipid bodies with cDNA cloning\",\n      \"pmids\": [\"11481335\", \"11481333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural information on the active site\", \"Substrate channeling mechanism unknown\", \"Relative contributions of DGAT1 vs DGAT2 in vivo undefined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating that DGAT2 knockout is neonatally lethal while DGAT1 knockout is not revealed that the two DGAT enzymes have non-redundant physiological roles, with DGAT2 essential for skin barrier lipids and systemic TG homeostasis.\",\n      \"evidence\": \"Germline knockout mice with lipid quantification, histological analysis of skin barrier, and metabolic profiling\",\n      \"pmids\": [\"14668353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DGAT2 essentiality is tissue-specific was unclear\", \"Mechanism of skin barrier lipid dependence on DGAT2 unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Discovery that DGAT2 physically interacts with SCD1 in the ER via co-IP and FRET established a substrate channeling model in which monounsaturated fatty acids produced by SCD1 are directly funneled to DGAT2 for TG synthesis.\",\n      \"evidence\": \"Co-immunoprecipitation, confocal colocalization, and FRET in HeLa cells; subcellular fractionation of mouse liver\",\n      \"pmids\": [\"16751624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of SCD1–DGAT2 interaction unknown\", \"Whether channeling is obligatory or modulatory not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"ASO knockdown of DGAT2 in obese rats reversed hepatic steatosis and insulin resistance, placing DGAT2 downstream of SREBP1c in de novo lipogenesis and demonstrating its pathophysiological role in fatty liver disease.\",\n      \"evidence\": \"In vivo ASO knockdown with hyperinsulinemic-euglycemic clamp, hepatic DAG/TG quantification, and gene expression analysis\",\n      \"pmids\": [\"17526931\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional regulation of DGAT2 by SREBP1c not shown at the promoter level\", \"Relative contribution of reduced TG synthesis vs increased oxidation to phenotype unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying that DGAT2 redistributes from the ER to lipid droplet–mitochondria contact sites upon oleate loading, and that its unique N-terminal mitochondrial targeting signal mediates MAM localization, revealed how DGAT2 accesses different membrane compartments for TG synthesis.\",\n      \"evidence\": \"Live-cell imaging, subcellular fractionation, MAM isolation, and deletion mutagenesis with RFP fusions\",\n      \"pmids\": [\"19049983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of mitochondrial targeting for TG metabolism not established\", \"Signal for return to ER not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that DGAT2 forms homodimers within a ~650 kDa complex containing MGAT2, and that MGAT2-derived DAG triggers DGAT2 translocation to lipid droplets, established a substrate-channeling complex that couples sequential acylation reactions on LD surfaces.\",\n      \"evidence\": \"Chemical cross-linking, co-IP, proximity ligation assay, deletion mutagenesis, and TG storage assays in McArdle RH7777 cells\",\n      \"pmids\": [\"25164810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full composition of the ~650 kDa complex not determined\", \"Whether MGAT2–DGAT2 coupling is obligatory for LD-directed TG synthesis unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identification of a dominantly acting DGAT2 p.Y223H mutation causing axonal Charcot-Marie-Tooth disease extended DGAT2's functional significance beyond lipid storage to neuronal/axonal biology.\",\n      \"evidence\": \"Exome sequencing, overexpression in mouse motor neuron cells (proliferation assay), zebrafish axonal branching assay\",\n      \"pmids\": [\"26786738\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which DGAT2 mutation impairs axonal branching unknown\", \"Whether enzymatic activity or an alternative function is affected not determined\", \"Single family reported\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Detailed kinetic characterization of DGAT2 inhibitors revealed a two-step slow-onset inhibition mechanism and identified H161/H163 as critical residues for inhibitor binding, providing the first active-site mapping of the enzyme.\",\n      \"evidence\": \"Time-dependent inhibition kinetics, radioligand binding, site-directed mutagenesis of H161A and H163A\",\n      \"pmids\": [\"30422629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of DGAT2\", \"Whether H161/H163 are catalytic residues or only inhibitor-binding residues not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Delineating that DGAT2 primarily supports VLDL particle number while DGAT1 determines VLDL particle size established distinct roles for the two enzymes in hepatic lipoprotein assembly.\",\n      \"evidence\": \"Liver-specific DGAT1 KO mice, DGAT1/DGAT2-specific inhibitors in HepG2 cells, VLDL secretion assays, electron microscopy\",\n      \"pmids\": [\"30397187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DGAT2 directly lipidates apoB or acts indirectly via ER TG pools not determined\", \"Mechanism of functional compensation between DGAT1 and DGAT2 for apoB secretion unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showing that DGAT2-synthesized TG preferentially populates larger lipid droplets while DGAT1-synthesized TG goes to smaller, ATGL-accessible droplets defined distinct metabolic fates for TG produced by each enzyme.\",\n      \"evidence\": \"Selective pharmacological inhibition of DGAT1/DGAT2 in Huh7 cells, LD size quantification, ATGL colocalization, fatty acid oxidation measurement\",\n      \"pmids\": [\"37516308\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism determining LD size specificity unknown\", \"Whether this reflects ER subdomain localization or LD surface targeting not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of Rab1b as a GTPase promoting DGAT2 redistribution from ER to lipid droplets, with disease relevance via the Rab1b-GAP TBC1D20 in Warburg Micro syndrome, revealed a GTPase-regulated trafficking step in DGAT2 targeting.\",\n      \"evidence\": \"FRET between DGAT2 and Rab1b activity mutants, dominant-negative Rab1b, in vitro DAG recruitment assay, Warburg Micro syndrome mouse fibroblasts\",\n      \"pmids\": [\"38809969\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between Rab1b and DGAT2 not confirmed by reciprocal pull-down\", \"Whether Rab1b acts on DGAT2 directly or via membrane remodeling not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Reconstitution of ATG2A-mediated DAG transfer from ER to lipid droplets as the upstream signal recruiting DGAT2 to LDs unified the DAG-sensing, ER-to-LD relocalization, and LD expansion mechanisms into a single pathway.\",\n      \"evidence\": \"In vitro lipid transfer reconstitution, ATG2A KO/KD, DAG-mediated DGAT2 recruitment to artificial LDs, live-cell imaging\",\n      \"pmids\": [\"41249819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"DAG-binding domain on DGAT2 not mapped\", \"Whether other lipid transfer proteins can substitute for ATG2A unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstration that amyloid-β induces DGAT2-dependent lipid droplet accumulation in microglia and that DGAT2 inhibition restores Aβ phagocytosis and reduces plaque burden established DGAT2 as a pathogenic mediator in Alzheimer's disease neuroinflammation.\",\n      \"evidence\": \"Lipidomics of Aβ-treated microglia, DGAT2 KO and pharmacological inhibition, phagocytosis assay, 5xFAD mouse model with plaque quantification\",\n      \"pmids\": [\"40393454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DGAT2 inhibition affects microglial polarization beyond LD metabolism not determined\", \"Long-term cognitive outcomes of DGAT2 inhibition not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"No high-resolution structure of DGAT2 exists; the catalytic mechanism, the DAG-sensing domain mediating LD recruitment, the basis for DGAT1/DGAT2 non-redundancy at the structural level, and the mechanism linking DGAT2 to axonal integrity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure available\", \"DAG-binding site on DGAT2 not mapped\", \"Molecular basis of axonal CMT phenotype completely unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [6, 14, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 6]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [6, 7, 14, 15]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 2, 5, 7, 10, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [14, 19]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 16]}\n    ],\n    \"complexes\": [\n      \"DGAT2–MGAT2 ~650 kDa complex\"\n    ],\n    \"partners\": [\n      \"SCD1\",\n      \"MGAT2\",\n      \"RAB1B\",\n      \"ATG2A\",\n      \"TBC1D20\",\n      \"FAAH\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}