{"gene":"DGAT2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2001,"finding":"DGAT2 encodes a diacylglycerol acyltransferase that catalyzes triacylglycerol synthesis using fatty acyl-CoA and diacylglycerol as substrates; activity was demonstrated in insect cell expression systems and is inhibited by high MgCl2 (100 mM), distinguishing it from DGAT1. It belongs to a gene family with no homology to DGAT1.","method":"Heterologous expression in insect cells, in vitro enzyme activity assay with radiolabeled substrates, substrate specificity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzyme reconstitution with substrate specificity profiling, independently replicated across two papers (PMID:11481335 and PMID:11481333)","pmids":["11481335","11481333"],"is_preprint":false},{"year":2003,"finding":"DGAT2 is essential for mammalian survival; DGAT2-knockout mice are profoundly lipopenic and die shortly after birth due to energy substrate deficiency and impaired skin permeability barrier function. DGAT1 cannot compensate for loss of DGAT2, indicating the two enzymes serve fundamentally different roles.","method":"Gene knockout in mice (Dgat2-/- mice), phenotypic analysis including lipid quantification and skin barrier assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with multiple defined phenotypic readouts (lipid depletion, skin barrier failure, postnatal lethality) in a rigorous mouse model","pmids":["14668353"],"is_preprint":false},{"year":2008,"finding":"DGAT2 localizes to the endoplasmic reticulum under basal conditions and redistributes to lipid droplet surfaces and mitochondria-associated membranes (MAMs) upon oleate loading. The N-terminal 67 amino acids of DGAT2, containing a conserved positively charged mitochondrial targeting signal (residues 61–66), are sufficient to direct a fluorescent protein reporter to mitochondria.","method":"Live-cell fluorescence imaging, biochemical fractionation, deletion mutagenesis with fluorescent protein fusions, oleate loading experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (imaging, fractionation, mutagenesis) in a single rigorous study","pmids":["19049983"],"is_preprint":false},{"year":2006,"finding":"DGAT2 co-localizes with SCD1 (stearoyl-CoA desaturase 1) in the ER, as shown by confocal microscopy co-localization, co-immunoprecipitation, and FRET, consistent with substrate channeling of SCD1-generated monounsaturated fatty acids directly to DGAT2 for triglyceride synthesis.","method":"Confocal microscopy co-localization, co-immunoprecipitation, FRET in HeLa cells, subcellular fractionation of mouse liver","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — three orthogonal methods (co-IP, FRET, co-localization) from a single lab","pmids":["16751624"],"is_preprint":false},{"year":2007,"finding":"Antisense oligonucleotide knockdown of hepatic DGAT2 (but not DGAT1) in diet-induced obese rats reduces hepatic diacylglycerol and triglyceride content and reverses hepatic insulin resistance, associated with reduced SREBP1c-mediated lipogenesis and increased fatty acid oxidation, identifying DGAT2 as the isoform primarily linked to de novo lipogenic triglyceride synthesis.","method":"Antisense oligonucleotide knockdown in rats, hepatic lipid quantification, insulin sensitivity assays (hyperinsulinemic-euglycemic clamp), gene expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — selective isoform knockdown with multiple metabolic readouts, replicated in separate models","pmids":["17526931"],"is_preprint":false},{"year":2004,"finding":"Niacin noncompetitively inhibits DGAT2 but not DGAT1 activity in HepG2 microsomal fractions, decreasing apparent Vmax without altering Km, and has no effect on DGAT1 or DGAT2 mRNA expression.","method":"Microsomal enzyme activity assay, enzyme kinetics (Lineweaver-Burk), isoform-specific activity measurement in HepG2 cells","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous kinetic characterization in a single lab with a single cell model","pmids":["15258194"],"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-localizes with MGAT2 in the ER and on lipid droplets, and co-expression increases triglyceride storage. No significant interaction with lipin1 was detected.","method":"Chemical cross-linking (DSS), co-immunoprecipitation, in situ proximity ligation assay, deletion mutagenesis, confocal co-localization, lipid droplet imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (crosslinking, co-IP, PLA, mutagenesis) in a single rigorous study","pmids":["25164810"],"is_preprint":false},{"year":2018,"finding":"Imidazopyridine DGAT2 inhibitors (PF-06424439 and compound 2) act as slowly reversible, time-dependent, noncompetitive inhibitors with respect to acyl-CoA via a two-step binding mechanism (EI → EI* isomerization), with Ki*app ~16 nM and EI* dissociation half-lives of ~1 h. Histidine residues H161 and H163 are critical for inhibitor binding, as H161A and H163A mutations reduced inhibitor binding to 11–17% of wild-type.","method":"Enzyme kinetics assays, time-dependent inhibition analysis, radioligand binding with 125I-labeled inhibitor, site-directed mutagenesis","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous kinetic and mutagenesis analysis in a single study with multiple orthogonal methods","pmids":["30422629"],"is_preprint":false},{"year":2016,"finding":"A de novo missense mutation (p.Y223H) in DGAT2 causes autosomal-dominant early-onset axonal Charcot-Marie-Tooth disease. Overexpression of mutant DGAT2 significantly inhibited proliferation of mouse motor neuron cells, and the variant inhibited axonal branching in zebrafish peripheral nervous system.","method":"Exome sequencing, in vitro motor neuron cell proliferation assay, zebrafish axonal branching assay","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — variant identification plus functional assays in two orthogonal systems (cell and zebrafish), single lab","pmids":["26786738"],"is_preprint":false},{"year":2019,"finding":"In adipocyte-specific DGAT2 knockout mice, DGAT2 is not essential for adipose triglyceride storage or glucose metabolism on regular or high-fat diets, demonstrating that DGAT1 can fully compensate for DGAT2 loss specifically in adipocytes.","method":"Adipocyte-specific conditional knockout mice, body composition analysis, metabolic phenotyping on chow and high-fat diets","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean tissue-specific KO with comprehensive metabolic phenotyping","pmids":["30936184"],"is_preprint":false},{"year":2010,"finding":"DGAT2 upregulation in alcoholic liver disease is mediated by suppression of the MEK/ERK1/2 pathway; specific MEK/ERK1/2 inhibitors increased DGAT2 expression and triglyceride content in HepG2 cells, while ERK1/2 activation (by EGF) had the opposite effect. Disrupted transmethylation (reduced SAM/SAH ratio) by alcohol contributes to ERK1/2 suppression and consequent DGAT2 upregulation.","method":"In vitro pharmacological inhibition of MEK/ERK pathway in HepG2 cells, mRNA/protein expression analysis, triglyceride quantification, in vivo alcohol feeding model with betaine supplementation","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pathway epistasis with pharmacological tools, supported by both in vitro and in vivo data, single lab","pmids":["20739640"],"is_preprint":false},{"year":2024,"finding":"Rab1b, a GTPase regulating secretory transport, promotes DGAT2 redistribution from the ER to lipid droplet surfaces as shown by FRET between DGAT2 and Rab1b activity mutants. In TBC1D20-mutant (Warburg Micro syndrome) mouse fibroblasts, Rab1b activity and DGAT2 redistribution to lipid droplets are altered, linking this mechanism to a human disease.","method":"FRET analysis with DGAT2 and Rab1b mutants, dominant-negative overexpression, LD formation assays, analysis of TBC1D20-mutant mouse fibroblasts","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET and activity mutant analysis in a single study, supported by disease-relevant model","pmids":["38809969"],"is_preprint":false},{"year":2025,"finding":"ATG2A transfers DAG from the ER to lipid droplets; in ATG2A-deficient cells, DGAT2 fails to relocate to lipid droplets. In vitro, DAG recruits DGAT2 to lipid droplets. ATG2A-mediated DAG transfer is required for DGAT2 recruitment to the LD surface to promote LD expansion; DGAT2 inhibition reduces ATG2A-dependent LD growth.","method":"ATG2A loss-of-function, in vitro DAG-recruitment assay, LD imaging, DGAT2 inhibitor experiments","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstitution of DAG-dependent DGAT2 recruitment plus genetic loss-of-function with multiple orthogonal readouts","pmids":["41249819"],"is_preprint":false},{"year":2025,"finding":"Amyloid-β exposure drives microglial lipid droplet formation by increasing DGAT2 expression and shifting FFAs to TGs; pharmacological DGAT2 inhibition improved microglial Aβ phagocytosis and reduced plaque load and neuronal damage in 5xFAD mice.","method":"Pharmacological DGAT2 inhibition in vivo and in vitro, lipidomic analysis, microglial phagocytosis assays, plaque quantification in 5xFAD mice","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with multiple functional readouts in a single rigorous study","pmids":["40393454"],"is_preprint":false},{"year":2021,"finding":"In DGAT1-deficient HepG2 cells generated by CRISPR/Cas9 gene editing, endogenous DGAT2 protein stability is increased compared to wild-type cells, suggesting a compensatory post-translational mechanism regulating DGAT2 levels when DGAT1 is absent.","method":"CRISPR/Cas9 gene editing to FLAG-tag endogenous DGAT2, immunoblotting, DGAT1 inhibitor treatment","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — endogenous protein detection via gene editing, single lab, single method","pmids":["34116261"],"is_preprint":false},{"year":2023,"finding":"DGAT2-generated TG is stored in larger lipid droplets than DGAT1-generated TG in Huh7 hepatocytes; ATGL preferentially targets DGAT1-generated (smaller) LDs, and fatty acids from DGAT1-generated TG are preferentially used for beta-oxidation.","method":"Isoform-specific DGAT1/DGAT2 inhibitors in Huh7 cells, LD size analysis, ATGL co-localization, fatty acid oxidation assays","journal":"Biochimica et biophysica acta. Molecular and cell biology of lipids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological isoform discrimination with multiple orthogonal readouts, single lab","pmids":["37516308"],"is_preprint":false},{"year":2017,"finding":"A nonsense variant (p.R128*) in DGAT2 severely damages TG-biosynthesis activity in vitro. FAAH overexpression inhibits DGAT2 expression and TG synthesis, and a loss-of-function FAAH variant (p.R315I) eliminates this inhibitory effect, suggesting FAAH regulates DGAT2 expression and TG synthesis.","method":"In vitro TG synthesis assay with DGAT2 mutant, FAAH overexpression and knockdown in cells, TG quantification","journal":"Endocrine","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional mutation analysis plus overexpression epistasis, single lab","pmids":["28243972"],"is_preprint":false},{"year":2020,"finding":"CTRP12 (an adipokine) treatment in hepatoma cells and primary hepatocytes inhibits triglyceride synthesis by suppressing DGAT2 expression (along with GPAT), and also downregulates HNF-4α and MTTP, reducing VLDL-TG secretion.","method":"CTRP12 treatment of HepG2 cells and primary hepatocytes, DGAT expression analysis, VLDL-TG secretion assay, in vivo CTRP12 overexpression","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo data from a single lab, multiple readouts","pmids":["32749667"],"is_preprint":false},{"year":2014,"finding":"uPA stimulates triglyceride synthesis in Huh7 hepatoma cells via p38-dependent upregulation of DGAT2 expression; p38 inhibition abolishes uPA-stimulated triglyceride synthesis and DGAT2 upregulation. The effect requires binding of uPA to its receptor uPAR.","method":"uPA treatment with p38 inhibitors in Huh7 cells, TG synthesis assays, gene expression analysis, uPAR knockout mice","journal":"Atherosclerosis","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — pathway epistasis with pharmacological tools plus receptor-knockout in vivo validation, single lab","pmids":["25244504"],"is_preprint":false},{"year":2018,"finding":"In hepatocyte-specific DGAT1-knockout (DGAT1-LKO) mice, VLDL particle number is maintained (DGAT2 can fully support apoB secretion), but particle size and TG content per particle are approximately halved, demonstrating DGAT1 is uniquely required for full VLDL particle lipidation in the ER lumen while DGAT2 supports particle number.","method":"Hepatocyte-specific DGAT1 KO mice, Triton WR1339-based VLDL secretion assay, apoB quantification, electron microscopy of liver ER, DGAT isoform-specific inhibitors in HepG2 cells","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with multiple orthogonal methods (VLDL secretion, apoB, EM, inhibitors), isoform-discriminating design","pmids":["30397187"],"is_preprint":false},{"year":2023,"finding":"Knockdown of DGAT2 in C2C12 skeletal myotubes reduces glucose uptake (2-deoxyglucose), decreases GLUT4 mRNA, impairs insulin-stimulated Akt phosphorylation, and shifts oleic acid away from TG re-esterification toward free fatty acid accumulation and beta-oxidation, demonstrating DGAT2 regulates both glucose uptake and fatty acid partitioning in skeletal muscle.","method":"siRNA knockdown in C2C12 myotubes, radiolabeled glucose uptake assay, radiolabeled fatty acid incorporation assay, Akt phosphorylation immunoblot","journal":"Journal of microbiology and biotechnology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with multiple functional readouts, single lab","pmids":["37644753"],"is_preprint":false},{"year":2024,"finding":"DGAT2 knockdown in HepG2 cells suppresses mitochondrial function and promotes cell proliferation, associated with downregulation of ESRRA (estrogen-related receptor alpha) and increased ESRRA dimerization with corepressor PROX1, indicating DGAT2 sustains hepatic mitochondrial function partly through the ESRRA-PROX1 transcriptional network.","method":"DGAT2 knockdown in HepG2 cells, transcriptome analysis, ISMARA motif analysis, co-expression analysis from patient cohorts","journal":"Diabetes & metabolism journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single KD experiment, transcriptomics-based mechanism inference without direct protein interaction validation","pmids":["38644620"],"is_preprint":false},{"year":2019,"finding":"DGAT2 partially compensates for LD formation in DGAT1-deficient human intestinal organoids; overexpression of DGAT2 fully rescues LD formation and lipotoxicity caused by DGAT1 deficiency. Lipotoxicity in this context is mediated by ER stress.","method":"Patient-derived intestinal organoids with DGAT1 deficiency, DGAT2 overexpression rescue experiments, LD imaging, ER stress markers","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic complementation in a patient-derived human organoid model, multiple readouts, single lab","pmids":["31315900"],"is_preprint":false}],"current_model":"DGAT2 is an integral ER membrane enzyme that catalyzes the final step of triacylglycerol synthesis by transferring a fatty acyl chain from acyl-CoA to diacylglycerol; it is essential for mammalian survival (unlike DGAT1), localizes to the ER under basal conditions and redistributes to lipid droplet surfaces and mitochondria-associated membranes upon lipid loading via an N-terminal mitochondrial targeting signal and DAG-dependent recruitment facilitated by ATG2A and Rab1b, physically interacts with MGAT2 through its transmembrane domains to channel substrates for TG biosynthesis, preferentially synthesizes TG that is stored in larger lipid droplets than DGAT1-generated TG, and is regulated transcriptionally by the MEK/ERK pathway, SREBP1c, and upstream signals including CTRP12 and APOC3, with its catalytic activity inhibitable noncompetitively through a two-step binding mechanism at histidines H161/H163."},"narrative":{"mechanistic_narrative":"DGAT2 is an integral endoplasmic reticulum membrane enzyme that catalyzes the terminal, committed step of triacylglycerol synthesis, transferring a fatty acyl chain from acyl-CoA to diacylglycerol [PMID:11481335, PMID:11481333]. It is a distinct gene family from DGAT1, with no sequence homology, and the two enzymes are functionally non-redundant: DGAT2-knockout mice are profoundly lipopenic and die postnatally from energy substrate deficiency and skin barrier failure, a phenotype DGAT1 cannot rescue [PMID:11481335, PMID:11481333, PMID:14668353]. This non-redundancy is tissue- and product-specific — DGAT1 fully compensates in adipocytes [PMID:30936184] yet DGAT2 uniquely partitions newly synthesized TG into larger lipid droplets that are spared from ATGL-mediated lipolysis and beta-oxidation [PMID:37516308]. DGAT2 resides in the ER under basal conditions and, upon lipid loading, redistributes to lipid droplet surfaces and mitochondria-associated membranes; an N-terminal positively charged mitochondrial targeting signal (residues 61–66) directs this localization [PMID:19049983]. Recruitment to the lipid droplet surface requires DAG delivered by ATG2A and is promoted by the secretory GTPase Rab1b, coupling DGAT2 activity to lipid droplet expansion [PMID:38809969, PMID:41249819]. DGAT2 functions within higher-order assemblies, forming homodimers and a ~650 kDa complex and channeling substrates by physically interacting with MGAT2 via its transmembrane domains and co-localizing with SCD1 [PMID:16751624, PMID:25164810]. In the liver DGAT2 is the isoform tied to de novo lipogenic TG synthesis and to hepatic insulin resistance, and is regulated by signals including the MEK/ERK pathway, CTRP12, uPA/p38, and FAAH [PMID:17526931, PMID:20739640, PMID:32749667, PMID:25244504]. A de novo DGAT2 missense mutation (p.Y223H) causes autosomal-dominant early-onset axonal Charcot-Marie-Tooth disease [PMID:26786738]. The enzyme is selectively inhibitable by small molecules through a slowly reversible, noncompetitive two-step binding mechanism that depends on histidines H161 and H163 [PMID:30422629].","teleology":[{"year":2001,"claim":"Established the core biochemical identity of DGAT2 as a diacylglycerol acyltransferase distinct from DGAT1, answering what reaction the gene product catalyzes.","evidence":"Heterologous expression in insect cells with in vitro acyltransferase assays and substrate specificity profiling","pmids":["11481335","11481333"],"confidence":"High","gaps":["No structural basis for catalysis defined","Membrane topology and active-site residues not yet mapped"]},{"year":2003,"claim":"Demonstrated that DGAT2 is physiologically essential and non-redundant with DGAT1, resolving whether the two acyltransferases serve interchangeable roles.","evidence":"Constitutive Dgat2-knockout mice with lipid quantification and skin barrier assays","pmids":["14668353"],"confidence":"High","gaps":["Tissue-specific contributions not dissected by global KO","Molecular basis for non-redundancy unexplained"]},{"year":2006,"claim":"Identified physical proximity between DGAT2 and SCD1, supporting substrate channeling of monounsaturated fatty acids into TG synthesis.","evidence":"Confocal co-localization, co-IP, and FRET in HeLa cells plus liver fractionation","pmids":["16751624"],"confidence":"Medium","gaps":["Direct channeling of SCD1 product not biochemically demonstrated","Single-lab interaction data"]},{"year":2008,"claim":"Defined DGAT2 subcellular dynamics, showing basal ER residence and lipid-induced redistribution governed by an N-terminal mitochondrial targeting signal.","evidence":"Live-cell imaging, fractionation, and deletion mutagenesis with oleate loading","pmids":["19049983"],"confidence":"High","gaps":["Trafficking machinery for LD/MAM redistribution not identified at the time","Functional consequence of MAM localization unclear"]},{"year":2007,"claim":"Linked hepatic DGAT2 specifically to lipogenic TG synthesis and insulin resistance, distinguishing it from DGAT1 in metabolic disease.","evidence":"Antisense oligonucleotide knockdown in diet-induced obese rats with hyperinsulinemic-euglycemic clamps","pmids":["17526931"],"confidence":"High","gaps":["Mechanism connecting DGAT2 to SREBP1c regulation not resolved","Causal versus correlative role in insulin signaling not fully separated"]},{"year":2014,"claim":"Revealed DGAT2 quaternary organization and substrate-channeling partnership with MGAT2, explaining how the enzyme is embedded in a TG-synthesis assembly.","evidence":"Chemical cross-linking, co-IP, proximity ligation, and deletion mutagenesis identifying transmembrane-domain-mediated MGAT2 interaction","pmids":["25164810"],"confidence":"High","gaps":["Composition of the full ~650 kDa complex not enumerated","Stoichiometry of DGAT2-MGAT2 interaction unknown"]},{"year":2018,"claim":"Defined the kinetic mechanism and key residues for pharmacological DGAT2 inhibition, enabling selective targeting.","evidence":"Enzyme kinetics, time-dependent inhibition, radioligand binding, and H161/H163 site-directed mutagenesis with imidazopyridine inhibitors","pmids":["30422629"],"confidence":"High","gaps":["Whether H161/H163 are catalytic or purely inhibitor-binding residues not fully resolved","No co-crystal structure of inhibited enzyme"]},{"year":2018,"claim":"Separated the distinct contributions of DGAT1 and DGAT2 to hepatic VLDL assembly, showing DGAT2 supports particle number while DGAT1 drives full lipidation.","evidence":"Hepatocyte-specific DGAT1-KO mice with VLDL secretion assays, apoB quantification, EM, and isoform inhibitors","pmids":["30397187"],"confidence":"High","gaps":["Spatial site of DGAT2-supplied TG for VLDL not pinpointed","Mechanism of compartmentalized TG pools unclear"]},{"year":2019,"claim":"Showed DGAT2 dispensability in adipocytes and its ability to rescue DGAT1-deficient intestinal LD formation, refining the tissue map of isoform compensation.","evidence":"Adipocyte-specific DGAT2-KO mice and DGAT2 overexpression rescue in patient-derived intestinal organoids","pmids":["30936184","31315900"],"confidence":"High","gaps":["Determinants of tissue-specific compensation not defined","Why DGAT1 loss causes ER-stress lipotoxicity rescued by DGAT2 not mechanistically resolved"]},{"year":2023,"claim":"Established that DGAT2- versus DGAT1-generated TG enters functionally distinct lipid droplet pools with different lipolytic fates.","evidence":"Isoform-specific inhibitors in Huh7 cells with LD size analysis, ATGL co-localization, and fatty acid oxidation assays","pmids":["37516308"],"confidence":"Medium","gaps":["Molecular basis for differential LD targeting unknown","Single-lab pharmacological discrimination"]},{"year":2024,"claim":"Identified Rab1b as a regulator of DGAT2 ER-to-LD redistribution and connected this trafficking to a human disease model.","evidence":"FRET with DGAT2/Rab1b activity mutants and analysis of TBC1D20-mutant fibroblasts","pmids":["38809969"],"confidence":"Medium","gaps":["Direct Rab1b-DGAT2 physical contact not shown","How Rab1b activity controls DGAT2 movement mechanistically unclear"]},{"year":2025,"claim":"Defined the lipid-transfer mechanism recruiting DGAT2 to lipid droplets, showing ATG2A-delivered DAG is required for DGAT2 relocation and LD expansion.","evidence":"ATG2A loss-of-function, in vitro DAG-recruitment assay, LD imaging, and DGAT2 inhibitor experiments","pmids":["41249819"],"confidence":"High","gaps":["Whether DAG binding directly anchors DGAT2 or acts via partners not fully resolved","Generalizability beyond the studied cell systems untested"]},{"year":2025,"claim":"Extended DGAT2 function to microglial lipid droplet formation in Alzheimer pathology, implicating it in amyloid-driven immune dysfunction.","evidence":"Pharmacological DGAT2 inhibition in vitro and in 5xFAD mice with lipidomics, phagocytosis assays, and plaque quantification","pmids":["40393454"],"confidence":"Medium","gaps":["Direct enzymatic versus indirect contribution not separated","Off-target effects of inhibitor not fully excluded"]},{"year":null,"claim":"How DGAT2's distinct localization, substrate channeling, and lipid-droplet-product partitioning are integrated to produce a TG pool functionally separate from DGAT1 remains unresolved at the structural and mechanistic level.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of DGAT2 or its complexes","Composition of the ~650 kDa complex unknown","Mechanism coupling localization to distinct LD product identity undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,6,16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,3,6]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[2,6,12,15]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,4]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[12,15]}],"complexes":["DGAT2 homodimer / ~650 kDa membrane complex","DGAT2-MGAT2 complex"],"partners":["MGAT2","SCD1","ATG2A","RAB1B"],"other_free_text":[]}},"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 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It belongs to a gene family with no homology to DGAT1.\",\n      \"method\": \"Heterologous expression in insect cells, in vitro enzyme activity assay with radiolabeled substrates, substrate specificity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzyme reconstitution with substrate specificity profiling, independently replicated across two papers (PMID:11481335 and PMID:11481333)\",\n      \"pmids\": [\"11481335\", \"11481333\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"DGAT2 is essential for mammalian survival; DGAT2-knockout mice are profoundly lipopenic and die shortly after birth due to energy substrate deficiency and impaired skin permeability barrier function. DGAT1 cannot compensate for loss of DGAT2, indicating the two enzymes serve fundamentally different roles.\",\n      \"method\": \"Gene knockout in mice (Dgat2-/- mice), phenotypic analysis including lipid quantification and skin barrier assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with multiple defined phenotypic readouts (lipid depletion, skin barrier failure, postnatal lethality) in a rigorous mouse model\",\n      \"pmids\": [\"14668353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"DGAT2 localizes to the endoplasmic reticulum under basal conditions and redistributes to lipid droplet surfaces and mitochondria-associated membranes (MAMs) upon oleate loading. The N-terminal 67 amino acids of DGAT2, containing a conserved positively charged mitochondrial targeting signal (residues 61–66), are sufficient to direct a fluorescent protein reporter to mitochondria.\",\n      \"method\": \"Live-cell fluorescence imaging, biochemical fractionation, deletion mutagenesis with fluorescent protein fusions, oleate loading experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (imaging, fractionation, mutagenesis) in a single rigorous study\",\n      \"pmids\": [\"19049983\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DGAT2 co-localizes with SCD1 (stearoyl-CoA desaturase 1) in the ER, as shown by confocal microscopy co-localization, co-immunoprecipitation, and FRET, consistent with substrate channeling of SCD1-generated monounsaturated fatty acids directly to DGAT2 for triglyceride synthesis.\",\n      \"method\": \"Confocal microscopy co-localization, co-immunoprecipitation, FRET in HeLa cells, subcellular fractionation of mouse liver\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — three orthogonal methods (co-IP, FRET, co-localization) from a single lab\",\n      \"pmids\": [\"16751624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Antisense oligonucleotide knockdown of hepatic DGAT2 (but not DGAT1) in diet-induced obese rats reduces hepatic diacylglycerol and triglyceride content and reverses hepatic insulin resistance, associated with reduced SREBP1c-mediated lipogenesis and increased fatty acid oxidation, identifying DGAT2 as the isoform primarily linked to de novo lipogenic triglyceride synthesis.\",\n      \"method\": \"Antisense oligonucleotide knockdown in rats, hepatic lipid quantification, insulin sensitivity assays (hyperinsulinemic-euglycemic clamp), gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — selective isoform knockdown with multiple metabolic readouts, replicated in separate models\",\n      \"pmids\": [\"17526931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Niacin noncompetitively inhibits DGAT2 but not DGAT1 activity in HepG2 microsomal fractions, decreasing apparent Vmax without altering Km, and has no effect on DGAT1 or DGAT2 mRNA expression.\",\n      \"method\": \"Microsomal enzyme activity assay, enzyme kinetics (Lineweaver-Burk), isoform-specific activity measurement in HepG2 cells\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous kinetic characterization in a single lab with a single cell model\",\n      \"pmids\": [\"15258194\"],\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-localizes with MGAT2 in the ER and on lipid droplets, and co-expression increases triglyceride storage. No significant interaction with lipin1 was detected.\",\n      \"method\": \"Chemical cross-linking (DSS), co-immunoprecipitation, in situ proximity ligation assay, deletion mutagenesis, confocal co-localization, lipid droplet imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (crosslinking, co-IP, PLA, mutagenesis) in a single rigorous study\",\n      \"pmids\": [\"25164810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Imidazopyridine DGAT2 inhibitors (PF-06424439 and compound 2) act as slowly reversible, time-dependent, noncompetitive inhibitors with respect to acyl-CoA via a two-step binding mechanism (EI → EI* isomerization), with Ki*app ~16 nM and EI* dissociation half-lives of ~1 h. Histidine residues H161 and H163 are critical for inhibitor binding, as H161A and H163A mutations reduced inhibitor binding to 11–17% of wild-type.\",\n      \"method\": \"Enzyme kinetics assays, time-dependent inhibition analysis, radioligand binding with 125I-labeled inhibitor, site-directed mutagenesis\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous kinetic and mutagenesis analysis in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"30422629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A de novo missense mutation (p.Y223H) in DGAT2 causes autosomal-dominant early-onset axonal Charcot-Marie-Tooth disease. Overexpression of mutant DGAT2 significantly inhibited proliferation of mouse motor neuron cells, and the variant inhibited axonal branching in zebrafish peripheral nervous system.\",\n      \"method\": \"Exome sequencing, in vitro motor neuron cell proliferation assay, zebrafish axonal branching assay\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — variant identification plus functional assays in two orthogonal systems (cell and zebrafish), single lab\",\n      \"pmids\": [\"26786738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"In adipocyte-specific DGAT2 knockout mice, DGAT2 is not essential for adipose triglyceride storage or glucose metabolism on regular or high-fat diets, demonstrating that DGAT1 can fully compensate for DGAT2 loss specifically in adipocytes.\",\n      \"method\": \"Adipocyte-specific conditional knockout mice, body composition analysis, metabolic phenotyping on chow and high-fat diets\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean tissue-specific KO with comprehensive metabolic phenotyping\",\n      \"pmids\": [\"30936184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"DGAT2 upregulation in alcoholic liver disease is mediated by suppression of the MEK/ERK1/2 pathway; specific MEK/ERK1/2 inhibitors increased DGAT2 expression and triglyceride content in HepG2 cells, while ERK1/2 activation (by EGF) had the opposite effect. Disrupted transmethylation (reduced SAM/SAH ratio) by alcohol contributes to ERK1/2 suppression and consequent DGAT2 upregulation.\",\n      \"method\": \"In vitro pharmacological inhibition of MEK/ERK pathway in HepG2 cells, mRNA/protein expression analysis, triglyceride quantification, in vivo alcohol feeding model with betaine supplementation\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pathway epistasis with pharmacological tools, supported by both in vitro and in vivo data, single lab\",\n      \"pmids\": [\"20739640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Rab1b, a GTPase regulating secretory transport, promotes DGAT2 redistribution from the ER to lipid droplet surfaces as shown by FRET between DGAT2 and Rab1b activity mutants. In TBC1D20-mutant (Warburg Micro syndrome) mouse fibroblasts, Rab1b activity and DGAT2 redistribution to lipid droplets are altered, linking this mechanism to a human disease.\",\n      \"method\": \"FRET analysis with DGAT2 and Rab1b mutants, dominant-negative overexpression, LD formation assays, analysis of TBC1D20-mutant mouse fibroblasts\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET and activity mutant analysis in a single study, supported by disease-relevant model\",\n      \"pmids\": [\"38809969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATG2A transfers DAG from the ER to lipid droplets; in ATG2A-deficient cells, DGAT2 fails to relocate to lipid droplets. In vitro, DAG recruits DGAT2 to lipid droplets. ATG2A-mediated DAG transfer is required for DGAT2 recruitment to the LD surface to promote LD expansion; DGAT2 inhibition reduces ATG2A-dependent LD growth.\",\n      \"method\": \"ATG2A loss-of-function, in vitro DAG-recruitment assay, LD imaging, DGAT2 inhibitor experiments\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstitution of DAG-dependent DGAT2 recruitment plus genetic loss-of-function with multiple orthogonal readouts\",\n      \"pmids\": [\"41249819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Amyloid-β exposure drives microglial lipid droplet formation by increasing DGAT2 expression and shifting FFAs to TGs; pharmacological DGAT2 inhibition improved microglial Aβ phagocytosis and reduced plaque load and neuronal damage in 5xFAD mice.\",\n      \"method\": \"Pharmacological DGAT2 inhibition in vivo and in vitro, lipidomic analysis, microglial phagocytosis assays, plaque quantification in 5xFAD mice\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with multiple functional readouts in a single rigorous study\",\n      \"pmids\": [\"40393454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In DGAT1-deficient HepG2 cells generated by CRISPR/Cas9 gene editing, endogenous DGAT2 protein stability is increased compared to wild-type cells, suggesting a compensatory post-translational mechanism regulating DGAT2 levels when DGAT1 is absent.\",\n      \"method\": \"CRISPR/Cas9 gene editing to FLAG-tag 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 / Moderate — endogenous protein detection via gene editing, single lab, single method\",\n      \"pmids\": [\"34116261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DGAT2-generated TG is stored in larger lipid droplets than DGAT1-generated TG in Huh7 hepatocytes; ATGL preferentially targets DGAT1-generated (smaller) LDs, and fatty acids from DGAT1-generated TG are preferentially used for beta-oxidation.\",\n      \"method\": \"Isoform-specific DGAT1/DGAT2 inhibitors in Huh7 cells, LD size analysis, ATGL co-localization, fatty acid oxidation assays\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular and cell biology of lipids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological isoform discrimination with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"37516308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A nonsense variant (p.R128*) in DGAT2 severely damages TG-biosynthesis activity in vitro. FAAH overexpression inhibits DGAT2 expression and TG synthesis, and a loss-of-function FAAH variant (p.R315I) eliminates this inhibitory effect, suggesting FAAH regulates DGAT2 expression and TG synthesis.\",\n      \"method\": \"In vitro TG synthesis assay with DGAT2 mutant, FAAH overexpression and knockdown in cells, TG quantification\",\n      \"journal\": \"Endocrine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional mutation analysis plus overexpression epistasis, single lab\",\n      \"pmids\": [\"28243972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CTRP12 (an adipokine) treatment in hepatoma cells and primary hepatocytes inhibits triglyceride synthesis by suppressing DGAT2 expression (along with GPAT), and also downregulates HNF-4α and MTTP, reducing VLDL-TG secretion.\",\n      \"method\": \"CTRP12 treatment of HepG2 cells and primary hepatocytes, DGAT expression analysis, VLDL-TG secretion assay, in vivo CTRP12 overexpression\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo data from a single lab, multiple readouts\",\n      \"pmids\": [\"32749667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"uPA stimulates triglyceride synthesis in Huh7 hepatoma cells via p38-dependent upregulation of DGAT2 expression; p38 inhibition abolishes uPA-stimulated triglyceride synthesis and DGAT2 upregulation. The effect requires binding of uPA to its receptor uPAR.\",\n      \"method\": \"uPA treatment with p38 inhibitors in Huh7 cells, TG synthesis assays, gene expression analysis, uPAR knockout mice\",\n      \"journal\": \"Atherosclerosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — pathway epistasis with pharmacological tools plus receptor-knockout in vivo validation, single lab\",\n      \"pmids\": [\"25244504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In hepatocyte-specific DGAT1-knockout (DGAT1-LKO) mice, VLDL particle number is maintained (DGAT2 can fully support apoB secretion), but particle size and TG content per particle are approximately halved, demonstrating DGAT1 is uniquely required for full VLDL particle lipidation in the ER lumen while DGAT2 supports particle number.\",\n      \"method\": \"Hepatocyte-specific DGAT1 KO mice, Triton WR1339-based VLDL secretion assay, apoB quantification, electron microscopy of liver ER, DGAT isoform-specific inhibitors in HepG2 cells\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with multiple orthogonal methods (VLDL secretion, apoB, EM, inhibitors), isoform-discriminating design\",\n      \"pmids\": [\"30397187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Knockdown of DGAT2 in C2C12 skeletal myotubes reduces glucose uptake (2-deoxyglucose), decreases GLUT4 mRNA, impairs insulin-stimulated Akt phosphorylation, and shifts oleic acid away from TG re-esterification toward free fatty acid accumulation and beta-oxidation, demonstrating DGAT2 regulates both glucose uptake and fatty acid partitioning in skeletal muscle.\",\n      \"method\": \"siRNA knockdown in C2C12 myotubes, radiolabeled glucose uptake assay, radiolabeled fatty acid incorporation assay, Akt phosphorylation immunoblot\",\n      \"journal\": \"Journal of microbiology and biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with multiple functional readouts, single lab\",\n      \"pmids\": [\"37644753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DGAT2 knockdown in HepG2 cells suppresses mitochondrial function and promotes cell proliferation, associated with downregulation of ESRRA (estrogen-related receptor alpha) and increased ESRRA dimerization with corepressor PROX1, indicating DGAT2 sustains hepatic mitochondrial function partly through the ESRRA-PROX1 transcriptional network.\",\n      \"method\": \"DGAT2 knockdown in HepG2 cells, transcriptome analysis, ISMARA motif analysis, co-expression analysis from patient cohorts\",\n      \"journal\": \"Diabetes & metabolism journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single KD experiment, transcriptomics-based mechanism inference without direct protein interaction validation\",\n      \"pmids\": [\"38644620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DGAT2 partially compensates for LD formation in DGAT1-deficient human intestinal organoids; overexpression of DGAT2 fully rescues LD formation and lipotoxicity caused by DGAT1 deficiency. Lipotoxicity in this context is mediated by ER stress.\",\n      \"method\": \"Patient-derived intestinal organoids with DGAT1 deficiency, DGAT2 overexpression rescue experiments, LD imaging, ER stress markers\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic complementation in a patient-derived human organoid model, multiple readouts, single lab\",\n      \"pmids\": [\"31315900\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DGAT2 is an integral ER membrane enzyme that catalyzes the final step of triacylglycerol synthesis by transferring a fatty acyl chain from acyl-CoA to diacylglycerol; it is essential for mammalian survival (unlike DGAT1), localizes to the ER under basal conditions and redistributes to lipid droplet surfaces and mitochondria-associated membranes upon lipid loading via an N-terminal mitochondrial targeting signal and DAG-dependent recruitment facilitated by ATG2A and Rab1b, physically interacts with MGAT2 through its transmembrane domains to channel substrates for TG biosynthesis, preferentially synthesizes TG that is stored in larger lipid droplets than DGAT1-generated TG, and is regulated transcriptionally by the MEK/ERK pathway, SREBP1c, and upstream signals including CTRP12 and APOC3, with its catalytic activity inhibitable noncompetitively through a two-step binding mechanism at histidines H161/H163.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DGAT2 is an integral endoplasmic reticulum membrane enzyme that catalyzes the terminal, committed step of triacylglycerol synthesis, transferring a fatty acyl chain from acyl-CoA to diacylglycerol [#0]. It is a distinct gene family from DGAT1, with no sequence homology, and the two enzymes are functionally non-redundant: DGAT2-knockout mice are profoundly lipopenic and die postnatally from energy substrate deficiency and skin barrier failure, a phenotype DGAT1 cannot rescue [#0, #1]. This non-redundancy is tissue- and product-specific — DGAT1 fully compensates in adipocytes [#9] yet DGAT2 uniquely partitions newly synthesized TG into larger lipid droplets that are spared from ATGL-mediated lipolysis and beta-oxidation [#15]. DGAT2 resides in the ER under basal conditions and, upon lipid loading, redistributes to lipid droplet surfaces and mitochondria-associated membranes; an N-terminal positively charged mitochondrial targeting signal (residues 61\\u201366) directs this localization [#2]. Recruitment to the lipid droplet surface requires DAG delivered by ATG2A and is promoted by the secretory GTPase Rab1b, coupling DGAT2 activity to lipid droplet expansion [#11, #12]. DGAT2 functions within higher-order assemblies, forming homodimers and a ~650 kDa complex and channeling substrates by physically interacting with MGAT2 via its transmembrane domains and co-localizing with SCD1 [#3, #6]. In the liver DGAT2 is the isoform tied to de novo lipogenic TG synthesis and to hepatic insulin resistance, and is regulated by signals including the MEK/ERK pathway, CTRP12, uPA/p38, and FAAH [#4, #10, #17, #18]. A de novo DGAT2 missense mutation (p.Y223H) causes autosomal-dominant early-onset axonal Charcot-Marie-Tooth disease [#8]. The enzyme is selectively inhibitable by small molecules through a slowly reversible, noncompetitive two-step binding mechanism that depends on histidines H161 and H163 [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the core biochemical identity of DGAT2 as a diacylglycerol acyltransferase distinct from DGAT1, answering what reaction the gene product catalyzes.\",\n      \"evidence\": \"Heterologous expression in insect cells with in vitro acyltransferase assays and substrate specificity profiling\",\n      \"pmids\": [\"11481335\", \"11481333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for catalysis defined\", \"Membrane topology and active-site residues not yet mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated that DGAT2 is physiologically essential and non-redundant with DGAT1, resolving whether the two acyltransferases serve interchangeable roles.\",\n      \"evidence\": \"Constitutive Dgat2-knockout mice with lipid quantification and skin barrier assays\",\n      \"pmids\": [\"14668353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contributions not dissected by global KO\", \"Molecular basis for non-redundancy unexplained\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified physical proximity between DGAT2 and SCD1, supporting substrate channeling of monounsaturated fatty acids into TG synthesis.\",\n      \"evidence\": \"Confocal co-localization, co-IP, and FRET in HeLa cells plus liver fractionation\",\n      \"pmids\": [\"16751624\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct channeling of SCD1 product not biochemically demonstrated\", \"Single-lab interaction data\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined DGAT2 subcellular dynamics, showing basal ER residence and lipid-induced redistribution governed by an N-terminal mitochondrial targeting signal.\",\n      \"evidence\": \"Live-cell imaging, fractionation, and deletion mutagenesis with oleate loading\",\n      \"pmids\": [\"19049983\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery for LD/MAM redistribution not identified at the time\", \"Functional consequence of MAM localization unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Linked hepatic DGAT2 specifically to lipogenic TG synthesis and insulin resistance, distinguishing it from DGAT1 in metabolic disease.\",\n      \"evidence\": \"Antisense oligonucleotide knockdown in diet-induced obese rats with hyperinsulinemic-euglycemic clamps\",\n      \"pmids\": [\"17526931\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting DGAT2 to SREBP1c regulation not resolved\", \"Causal versus correlative role in insulin signaling not fully separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed DGAT2 quaternary organization and substrate-channeling partnership with MGAT2, explaining how the enzyme is embedded in a TG-synthesis assembly.\",\n      \"evidence\": \"Chemical cross-linking, co-IP, proximity ligation, and deletion mutagenesis identifying transmembrane-domain-mediated MGAT2 interaction\",\n      \"pmids\": [\"25164810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Composition of the full ~650 kDa complex not enumerated\", \"Stoichiometry of DGAT2-MGAT2 interaction unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the kinetic mechanism and key residues for pharmacological DGAT2 inhibition, enabling selective targeting.\",\n      \"evidence\": \"Enzyme kinetics, time-dependent inhibition, radioligand binding, and H161/H163 site-directed mutagenesis with imidazopyridine inhibitors\",\n      \"pmids\": [\"30422629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether H161/H163 are catalytic or purely inhibitor-binding residues not fully resolved\", \"No co-crystal structure of inhibited enzyme\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Separated the distinct contributions of DGAT1 and DGAT2 to hepatic VLDL assembly, showing DGAT2 supports particle number while DGAT1 drives full lipidation.\",\n      \"evidence\": \"Hepatocyte-specific DGAT1-KO mice with VLDL secretion assays, apoB quantification, EM, and isoform inhibitors\",\n      \"pmids\": [\"30397187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial site of DGAT2-supplied TG for VLDL not pinpointed\", \"Mechanism of compartmentalized TG pools unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed DGAT2 dispensability in adipocytes and its ability to rescue DGAT1-deficient intestinal LD formation, refining the tissue map of isoform compensation.\",\n      \"evidence\": \"Adipocyte-specific DGAT2-KO mice and DGAT2 overexpression rescue in patient-derived intestinal organoids\",\n      \"pmids\": [\"30936184\", \"31315900\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants of tissue-specific compensation not defined\", \"Why DGAT1 loss causes ER-stress lipotoxicity rescued by DGAT2 not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established that DGAT2- versus DGAT1-generated TG enters functionally distinct lipid droplet pools with different lipolytic fates.\",\n      \"evidence\": \"Isoform-specific inhibitors in Huh7 cells with LD size analysis, ATGL co-localization, and fatty acid oxidation assays\",\n      \"pmids\": [\"37516308\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis for differential LD targeting unknown\", \"Single-lab pharmacological discrimination\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified Rab1b as a regulator of DGAT2 ER-to-LD redistribution and connected this trafficking to a human disease model.\",\n      \"evidence\": \"FRET with DGAT2/Rab1b activity mutants and analysis of TBC1D20-mutant fibroblasts\",\n      \"pmids\": [\"38809969\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Rab1b-DGAT2 physical contact not shown\", \"How Rab1b activity controls DGAT2 movement mechanistically unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined the lipid-transfer mechanism recruiting DGAT2 to lipid droplets, showing ATG2A-delivered DAG is required for DGAT2 relocation and LD expansion.\",\n      \"evidence\": \"ATG2A loss-of-function, in vitro DAG-recruitment assay, LD imaging, and DGAT2 inhibitor experiments\",\n      \"pmids\": [\"41249819\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DAG binding directly anchors DGAT2 or acts via partners not fully resolved\", \"Generalizability beyond the studied cell systems untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended DGAT2 function to microglial lipid droplet formation in Alzheimer pathology, implicating it in amyloid-driven immune dysfunction.\",\n      \"evidence\": \"Pharmacological DGAT2 inhibition in vitro and in 5xFAD mice with lipidomics, phagocytosis assays, and plaque quantification\",\n      \"pmids\": [\"40393454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic versus indirect contribution not separated\", \"Off-target effects of inhibitor not fully excluded\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DGAT2's distinct localization, substrate channeling, and lipid-droplet-product partitioning are integrated to produce a TG pool functionally separate from DGAT1 remains unresolved at the structural and mechanistic level.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of DGAT2 or its complexes\", \"Composition of the ~650 kDa complex unknown\", \"Mechanism coupling localization to distinct LD product identity undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 6, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 3, 6]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [2, 6, 12, 15]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [12, 15]}\n    ],\n    \"complexes\": [\n      \"DGAT2 homodimer / ~650 kDa membrane complex\",\n      \"DGAT2-MGAT2 complex\"\n    ],\n    \"partners\": [\n      \"MGAT2\",\n      \"SCD1\",\n      \"ATG2A\",\n      \"Rab1b\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}