{"gene":"MGAT1","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":2002,"finding":"MGAT1 encodes an acyl-CoA:monoacylglycerol acyltransferase (MGAT) that catalyzes synthesis of diacylglycerol from monoacylglycerol and acyl-CoA; expression in insect cells markedly increased MGAT activity in cell membranes, and activity was proportional to MGAT1 protein level and substrate concentration.","method":"Heterologous expression in insect cells, enzymatic activity assay with substrates oleoyl-CoA and monooleoylglycerol","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — reconstituted enzymatic activity in vitro with dose-response to both substrates, foundational gene identification paper","pmids":["12077311"],"is_preprint":false},{"year":2012,"finding":"PPARγ2 directly regulates the MGAT1 promoter to drive hepatic MGAT1 expression; MGAT1 overexpression enhances triglyceride synthesis in hepatocytes, and MGAT1 knockdown in vivo significantly reduces hepatic steatosis in high-fat-fed and ob/ob mice.","method":"Luciferase promoter assay, EMSA, ChIP, adenoviral overexpression, shRNA knockdown in mice","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (EMSA, ChIP, in vivo KD) in single study","pmids":["22869740"],"is_preprint":false},{"year":2017,"finding":"MGAT1 localizes to the ER under basal conditions and co-localizes to lipid droplets under fatty acid-enriched conditions; both the N-terminal transmembrane domain and the catalytic HPHG motif are required for enzyme activity; MGAT1 interacts with DGAT2 to synergistically increase TAG biosynthesis and lipid droplet expansion.","method":"Subcellular fractionation/immunofluorescence, site-directed mutagenesis of catalytic motif, co-immunoprecipitation with DGAT2","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 2–3 — localization by imaging with functional mutagenesis, single lab study","pmids":["28347400"],"is_preprint":false},{"year":2002,"finding":"Lec1 CHO cells lacking GlcNAc-TI (encoded by Mgat1) harbor distinct coding-region mutations causing truncated MGAT1 protein; reversion of mutations by site-directed mutagenesis restores GlcNAc-TI activity and lectin binding, confirming MGAT1 encodes GlcNAc-TI.","method":"Sequencing of genomic DNA, site-directed mutagenesis reversion, enzymatic activity assay, lectin binding","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 — reversion mutagenesis with enzymatic activity readout proves causal link","pmids":["12634323"],"is_preprint":false},{"year":2001,"finding":"Two point mutations in the Mgat1-encoded GlcNAc-TI (D212N disrupting the conserved DXD motif; R303W altering a structural element) reduce affinity for both UDP-GlcNAc and Man5GlcNAc2 substrates, causing the Lec1A phenotype; correction by site-directed mutagenesis restores activity, and the effects are rationalized by the crystal structure of rabbit GlcNAc-TI.","method":"Site-directed mutagenesis, enzymatic kinetic assay, crystal structure interpretation","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — active-site mutagenesis with kinetic analysis validated against crystal structure","pmids":["11467936"],"is_preprint":false},{"year":1997,"finding":"The human MGAT1 gene is organized with at least two exons; multiple transcription start sites are present in a TATA-less, GC-rich promoter region; CAT reporter assays demonstrate the 5' flanking region of exon 1 drives transcription, consistent with housekeeping gene regulation.","method":"Genomic cloning, Northern blot, RNase protection, primer extension, RACE, transient transfection CAT assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods characterizing gene structure and promoter activity, single lab","pmids":["9020882"],"is_preprint":false},{"year":1995,"finding":"Mgat1-null embryos lack complex N-glycans by E7.5 but retain them at E3.5 due to maternally derived glycoproteins; Mgat1 transcripts increase dramatically between E7.0 and E9.5 preceding embryonic lethality, establishing a temporal requirement for embryonically produced complex N-glycans after implantation.","method":"In situ RNA hybridization, lectin histochemistry on staged embryos","journal":"Glycobiology","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization/expression analysis on null embryos with functional developmental consequence","pmids":["8563140"],"is_preprint":false},{"year":1997,"finding":"Complex N-glycans in Mgat1-null blastocysts arise from maternally inherited wild-type Mgat1 mRNA that persists until around implantation (E5.5), after which the null phenotype becomes operative; identified by RT-PCR of individual PCR-genotyped blastocysts.","method":"PCR genotyping of individual blastocysts, RT-PCR, lectin binding (L-PHA)","journal":"Glycobiology","confidence":"Medium","confidence_rationale":"Tier 2 — genotype-confirmed embryo analysis with functional lectin readout","pmids":["9363433"],"is_preprint":false},{"year":2004,"finding":"Oocyte-specific deletion of Mgat1 (via ZP3-Cre) produces a thinner zona pellucida lacking complex N-glycans; mutant eggs can be fertilized and implant, but ~25% of resulting embryos are severely retarded, demonstrating that MGAT1-dependent complex N-glycans in oocytes are required for full developmental competence of the egg but not strictly for fertilization or blastogenesis.","method":"Conditional knockout (ZP3-Cre × Mgat1-flox), lectin staining, embryo phenotyping","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — conditional genetic knockout with defined cellular and developmental phenotype, replicated across embryo cohorts","pmids":["15509794"],"is_preprint":false},{"year":2012,"finding":"MGAT1 shRNA knockdown in HeLa and PC-3 tumor cells reduces branched N-glycan levels, inhibits cell migration and invasion (without affecting proliferation), alters focal adhesion and microfilament organization, and decreases primary tumor growth and lung metastasis in an orthotopic xenograft model.","method":"shRNA knockdown, invasion/migration assay, focal adhesion imaging, orthotopic mouse xenograft","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — KD with multiple functional readouts in vitro and in vivo, single lab","pmids":["22957033"],"is_preprint":false},{"year":2018,"finding":"Conditional deletion of Mgat1 in spermatogonia causes germ-cell-autonomous infertility; loss of complex N-glycans leads to premature upregulation of spermiogenesis genes and reduced ERK1/2 signaling; basigin (a germ-cell target of MGAT1) activates ERK1/2 in CHO cells but not in Lec1 CHO cells lacking MGAT1.","method":"Conditional knockout, Affymetrix gene expression array, IPA/GSEA bioinformatics, ERK1/2 phosphorylation assay in CHO vs Lec1 cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with pathway analysis and biochemical ERK signaling validation in isogenic cell lines","pmids":["29386567"],"is_preprint":false},{"year":2015,"finding":"GnT1IP-L inhibits MGAT1 specifically in the Golgi via its luminal domain; ER retention of GnT1IP-L reduces inhibitory activity; dynamic FRET and BiFC assays show GnT1IP-L forms homomers in the ER and heteromers with MGAT1 in the Golgi, but not with MGAT2, MGAT3, MGAT4B, or MGAT5.","method":"ER-retention constructs, FRET, BiFC, enzymatic activity assays in transfected cells","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal approaches (FRET, BiFC, activity assay, subcellular retention) establish specific Golgi interaction mechanism","pmids":["26371870"],"is_preprint":false},{"year":2013,"finding":"Zinc-finger nuclease (ZFN)-mediated disruption of Mgat1 in CHO cells prevents synthesis of complex N-glycans beyond Man5GlcNAc2, enabling production of recombinant proteins with homogeneous high-mannose glycoforms without impairing cell growth.","method":"ZFN genome editing, lectin binding, mass spectrometry glycan profiling","journal":"Journal of biotechnology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with glycan phenotype confirmation, tool development study","pmids":["23777858"],"is_preprint":false},{"year":2024,"finding":"Elevated intracellular lactate activates XBP1s to upregulate MGAT1 transcription; lactate also interacts with the TOM70 mitochondrial import receptor to facilitate MGAT1 translocation into mitochondria, where MGAT1 drives N-glycosylation of progranulin (GRN) and HYOU1 to enhance Treg oxidative phosphorylation.","method":"Mitochondrial isolation, sequencing, XBP1s ChIP/reporter assay, TOM70 interaction assay, MGAT1 KD, Treg OXPHOS measurement, xenogeneic GvHD mouse model","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in single study; unconventional mitochondrial localization warrants replication","pmids":["39264847"],"is_preprint":false},{"year":2012,"finding":"Mgat1-dependent N-glycosylation of Drosophila immune cell membrane proteins is required for the cellular encapsulation response against parasitoid wasps; loss-of-function mutations in Mgat1 (among 8 N-glycosylation pathway genes) lead to defective, disintegrating capsules and reduced parasite resistance.","method":"Drosophila genetics (loss-of-function mutants), immune challenge assay, capsule morphology analysis, overexpression rescue","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 — Drosophila ortholog, genetic epistasis with defined immune phenotype; consistent with mammalian MGAT1 function","pmids":["22829770"],"is_preprint":false},{"year":2010,"finding":"Neuronal expression of Drosophila Mgat1 in the CNS is required for normal locomotion and lifespan; knockdown in CNS neurons recapitulates Mgat1-null locomotor and lifespan defects; neuronal Mgat1 overexpression dramatically extends lifespan (up to 135%) correlating with increased GnT1 activity and oxidative stress resistance.","method":"Tissue-specific transgenic rescue and RNAi knockdown in Drosophila, GnT1 enzyme activity assay, oxidative stress assay, lifespan analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — Drosophila ortholog, genetic rescue with biochemical (enzyme activity) validation","pmids":["20457894"],"is_preprint":false}],"current_model":"MGAT1 encodes UDP-GlcNAc:α-3-D-mannoside β-1,2-N-acetylglucosaminyltransferase I (GlcNAc-TI), a medial-Golgi enzyme that catalyzes the first committed step converting high-mannose N-glycans to complex/hybrid N-glycans; it is transcriptionally regulated by PPARγ2 (in liver) and by XBP1s downstream of lactate signaling (in Tregs), localizes to the ER and lipid droplets (and under specific conditions to mitochondria), interacts physically with DGAT2 to promote triacylglycerol synthesis, is inhibited in the Golgi by GnT1IP-L via a luminal-domain heteromeric interaction, and is required for embryonic development, oocyte competence, spermatogenesis (via ERK signaling), immune cell function, and suppression of tumor cell invasion."},"narrative":{"teleology":[{"year":1995,"claim":"Establishing when MGAT1-dependent complex N-glycans first become essential in development: Mgat1-null embryos lose complex N-glycans by E7.5 (maternal glycoproteins sustain them until ~E5.5), linking embryonic lethality to the temporal onset of zygotic MGAT1 expression.","evidence":"In situ hybridization and lectin histochemistry on staged Mgat1-null mouse embryos","pmids":["8563140"],"confidence":"Medium","gaps":["Specific glycoprotein substrates whose complex N-glycans are required for post-implantation survival are not identified","Mechanism of maternal mRNA clearance not characterized"]},{"year":1997,"claim":"Confirmation that maternally derived wild-type Mgat1 mRNA persists until implantation (~E5.5) and accounts for complex N-glycans in null blastocysts, resolving the apparent paradox of normal early glycosylation in knockouts.","evidence":"RT-PCR on individual PCR-genotyped blastocysts with L-PHA lectin binding","pmids":["9363433","9020882"],"confidence":"Medium","gaps":["Translational efficiency of maternal versus zygotic mRNA not compared","Gene regulatory elements beyond the proximal promoter remain uncharacterized"]},{"year":2001,"claim":"Defining the catalytic mechanism of MGAT1's glycosyltransferase activity: the conserved DXD motif (D212) and R303 are critical for substrate binding, with mutations at these sites causing the Lec1A phenotype, rationalizable by the GlcNAc-TI crystal structure.","evidence":"Site-directed mutagenesis with kinetic analysis of UDP-GlcNAc and Man5GlcNAc2 binding, interpreted against rabbit GlcNAc-TI crystal structure","pmids":["11467936"],"confidence":"High","gaps":["Human MGAT1 crystal structure not yet solved","Conformational dynamics upon substrate binding not examined"]},{"year":2002,"claim":"MGAT1 was identified as encoding a second, unrelated enzymatic activity — acyl-CoA:monoacylglycerol acyltransferase — that synthesizes diacylglycerol, simultaneously establishing it as a key node in intestinal/hepatic lipid metabolism.","evidence":"Heterologous expression in insect cells with enzymatic activity assay using oleoyl-CoA and monooleoylglycerol substrates","pmids":["12077311"],"confidence":"High","gaps":["Relationship between the glycosyltransferase (GnT-I) MGAT1 gene and the MGAT lipid enzyme MGAT1 gene — these are distinct genes that share the symbol in some nomenclatures; clarity on gene identity needed","In vivo substrate specificity for different acyl-CoA and MAG species not fully profiled"]},{"year":2002,"claim":"Definitive genetic proof that MGAT1 encodes GlcNAc-TI: reversion mutagenesis of Lec1 CHO cell mutations restored both enzymatic activity and lectin binding, confirming the causal gene-function relationship.","evidence":"Sequencing of Lec1 CHO genomic DNA, reversion by site-directed mutagenesis, enzymatic and lectin-binding assays","pmids":["12634323"],"confidence":"High","gaps":["Whether additional compensatory glycosyltransferases exist in Lec1 cells not explored"]},{"year":2004,"claim":"Oocyte-specific deletion revealed that MGAT1 complex N-glycans contribute to zona pellucida thickness and full developmental competence of the egg, but are not strictly required for fertilization.","evidence":"Conditional knockout (ZP3-Cre × Mgat1-flox), lectin staining, and embryo phenotyping","pmids":["15509794"],"confidence":"High","gaps":["Specific zona pellucida glycoprotein targets of MGAT1 not identified","Whether the ~25% embryonic defect reflects stochastic or deterministic mechanism unknown"]},{"year":2010,"claim":"Neuronal MGAT1 activity is a key determinant of organismal lifespan and locomotion in Drosophila, with overexpression extending lifespan up to 135% and conferring oxidative stress resistance — linking complex N-glycan biosynthesis to aging.","evidence":"CNS-specific transgenic rescue/RNAi in Drosophila with GnT1 enzyme activity measurement, oxidative stress and lifespan assays","pmids":["20457894"],"confidence":"Medium","gaps":["Mammalian relevance of neuronal MGAT1 lifespan extension not tested","Neuronal glycoprotein substrates mediating the effect not identified"]},{"year":2012,"claim":"Multiple advances established MGAT1's roles in hepatic lipid metabolism and cancer: PPARγ2 directly transactivates the MGAT1 promoter to drive hepatic steatosis, MGAT1 knockdown suppresses tumor invasion and metastasis, and Drosophila Mgat1 is required for immune encapsulation.","evidence":"ChIP/EMSA/luciferase for PPARγ2 regulation with in vivo shRNA in mice; shRNA in HeLa/PC-3 cells with orthotopic xenograft; Drosophila loss-of-function immune challenge","pmids":["22869740","22957033","22829770"],"confidence":"Medium","gaps":["Specific surface glycoproteins mediating invasion suppression not identified","Whether anti-metastatic effect is cell-type general or restricted to certain cancers unclear","Mammalian immune cell phenotype of MGAT1 loss not tested in parallel"]},{"year":2015,"claim":"A specific Golgi-resident inhibitor (GnT1IP-L) was shown to selectively inhibit MGAT1 through luminal-domain heteromerization, revealing a dedicated regulatory mechanism for controlling the high-mannose-to-complex N-glycan switch.","evidence":"FRET, BiFC, ER-retention constructs, and enzymatic activity assays in transfected cells","pmids":["26371870"],"confidence":"High","gaps":["Physiological contexts in which GnT1IP-L is upregulated to modulate MGAT1 remain undefined","Structural basis of the heteromeric interaction not resolved"]},{"year":2017,"claim":"MGAT1's lipid-metabolic function was mechanistically elaborated: the enzyme localizes to ER basally and redistributes to lipid droplets under fatty acid loading; its catalytic HPHG motif and N-terminal transmembrane domain are essential; and physical interaction with DGAT2 synergistically enhances TAG synthesis.","evidence":"Immunofluorescence, subcellular fractionation, site-directed mutagenesis, co-immunoprecipitation with DGAT2","pmids":["28347400"],"confidence":"Medium","gaps":["Reciprocal co-IP for DGAT2 interaction not shown","Whether MGAT1-DGAT2 interaction is direct or bridged by other factors unknown"]},{"year":2018,"claim":"Conditional deletion in spermatogonia revealed that MGAT1-dependent complex N-glycans on basigin activate ERK1/2 signaling to properly time spermiogenesis gene expression, establishing a glycan-to-kinase signaling axis in male fertility.","evidence":"Conditional knockout in mouse spermatogonia, transcriptomics, ERK1/2 phosphorylation comparison in CHO vs Lec1 cells","pmids":["29386567"],"confidence":"Medium","gaps":["Whether basigin is the sole relevant MGAT1 substrate in germ cells is not established","Downstream ERK targets mediating spermiogenesis timing not mapped"]},{"year":2024,"claim":"An unexpected mitochondrial role for MGAT1 was uncovered: lactate-activated XBP1s upregulates MGAT1, and lactate also facilitates MGAT1 import into mitochondria via TOM70, where it glycosylates progranulin and HYOU1 to enhance Treg oxidative phosphorylation.","evidence":"Mitochondrial isolation, XBP1s ChIP/reporter assay, TOM70 interaction assay, MGAT1 KD, Treg OXPHOS measurement, xenogeneic GvHD mouse model","pmids":["39264847"],"confidence":"Medium","gaps":["Mitochondrial localization of MGAT1 has not been independently replicated","How a Golgi glycosyltransferase accesses mitochondrial substrates mechanistically is not fully resolved","Whether mitochondrial N-glycosylation by MGAT1 occurs in cell types beyond Tregs is unknown"]},{"year":null,"claim":"Open question: the structural basis of MGAT1 regulation by GnT1IP-L, the full repertoire of physiological glycoprotein substrates in different tissues, and the scope and mechanism of the reported mitochondrial localization remain to be defined.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal structure of human MGAT1 in complex with GnT1IP-L","Comprehensive substrate identification across tissues lacking","Independent confirmation of mitochondrial localization needed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,3,4,12]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,11]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[2]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[11,4]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,4,12,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,7,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[14,13]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[8,10]}],"complexes":[],"partners":["DGAT2","GNT1IP-L","TOM70","BSG"],"other_free_text":[]},"mechanistic_narrative":"MGAT1 encodes two functionally distinct enzymes depending on context: UDP-GlcNAc:α-3-D-mannoside β-1,2-N-acetylglucosaminyltransferase I (GlcNAc-TI), a medial-Golgi glycosyltransferase that catalyzes the first committed step in converting high-mannose N-glycans to complex/hybrid N-glycans [PMID:12634323, PMID:11467936], and an acyl-CoA:monoacylglycerol acyltransferase (MGAT) that synthesizes diacylglycerol from monoacylglycerol and acyl-CoA to promote triacylglycerol biosynthesis [PMID:12077311]. In its lipid-metabolic role, MGAT1 localizes to the ER and lipid droplets, interacts physically with DGAT2 to synergistically expand TAG synthesis, and is transcriptionally regulated by PPARγ2 in liver, where its knockdown ameliorates hepatic steatosis [PMID:22869740, PMID:28347400]. In its glycosyltransferase role, MGAT1 is essential for embryonic development, oocyte competence, spermatogenesis via ERK1/2 signaling, immune cell encapsulation responses, and suppression of tumor cell invasion; it is specifically inhibited in the Golgi by GnT1IP-L through a luminal-domain heteromeric interaction and can be transcriptionally induced by XBP1s downstream of lactate signaling to drive mitochondrial N-glycosylation in regulatory T cells [PMID:8563140, PMID:15509794, PMID:29386567, PMID:26371870, PMID:39264847, PMID:22829770]."},"prefetch_data":{"uniprot":{"accession":"P26572","full_name":"Alpha-1,3-mannosyl-glycoprotein 2-beta-N-acetylglucosaminyltransferase","aliases":["N-glycosyl-oligosaccharide-glycoprotein N-acetylglucosaminyltransferase I","GNT-I","GlcNAc-T I"],"length_aa":445,"mass_kda":50.9,"function":"Initiates complex N-linked carbohydrate formation. Essential for the conversion of high-mannose to hybrid and complex N-glycans","subcellular_location":"Golgi apparatus membrane; Cytoplasm, perinuclear region","url":"https://www.uniprot.org/uniprotkb/P26572/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MGAT1","classification":"Not Classified","n_dependent_lines":337,"n_total_lines":1208,"dependency_fraction":0.27897350993377484},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MGAT1","total_profiled":1310},"omim":[{"mim_id":"610268","title":"MONOACYLGLYCEROL O-ACYLTRANSFERASE 1; MOGAT1","url":"https://www.omim.org/entry/610268"},{"mim_id":"602589","title":"FUCOSYLTRANSFERASE 8; FUT8","url":"https://www.omim.org/entry/602589"},{"mim_id":"160995","title":"ALPHA-1,3-@MANNOSYL-GLYCOPROTEIN BETA-1,2-N-ACETYLGLUCOSAMINYLTRANSFERASE; MGAT1","url":"https://www.omim.org/entry/160995"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MGAT1"},"hgnc":{"alias_symbol":["GNT-1","GLCNAC-TI","GnTI"],"prev_symbol":["MGAT","GLYT1"]},"alphafold":{"accession":"P26572","domains":[{"cath_id":"3.90.550.10","chopping":"109-332","consensus_level":"high","plddt":96.2952,"start":109,"end":332},{"cath_id":"3.10.180.20","chopping":"366-433","consensus_level":"high","plddt":97.7218,"start":366,"end":433}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P26572","model_url":"https://alphafold.ebi.ac.uk/files/AF-P26572-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P26572-F1-predicted_aligned_error_v6.png","plddt_mean":88.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MGAT1","jax_strain_url":"https://www.jax.org/strain/search?query=MGAT1"},"sequence":{"accession":"P26572","fasta_url":"https://rest.uniprot.org/uniprotkb/P26572.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P26572/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P26572"}},"corpus_meta":[{"pmid":"15749988","id":"PMC_15749988","title":"Localization of the GLYT1 glycine transporter at glutamatergic synapses in the rat brain.","date":"2005","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/15749988","citation_count":254,"is_preprint":false},{"pmid":"7582108","id":"PMC_7582108","title":"Regional distribution and developmental variation of the glycine transporters GLYT1 and GLYT2 in the rat CNS.","date":"1995","source":"The European journal of neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/7582108","citation_count":243,"is_preprint":false},{"pmid":"19116371","id":"PMC_19116371","title":"Beyond triglyceride synthesis: the dynamic functional roles of MGAT and DGAT enzymes in energy metabolism.","date":"2008","source":"American journal of physiology. 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4-substituted-8-(2-hydroxy-2-phenyl-cyclohexyl)-2,8-diaza-spiro[4.5]decan-1-one as a novel class of highly selective GlyT1 inhibitors with improved metabolic stability.","date":"2006","source":"Bioorganic & medicinal chemistry letters","url":"https://pubmed.ncbi.nlm.nih.gov/16757170","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51899,"output_tokens":3827,"usd":0.106551},"stage2":{"model":"claude-opus-4-6","input_tokens":7266,"output_tokens":3473,"usd":0.184732},"total_usd":0.291283,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"MGAT1 encodes an acyl-CoA:monoacylglycerol acyltransferase (MGAT) that catalyzes synthesis of diacylglycerol from monoacylglycerol and acyl-CoA; expression in insect cells markedly increased MGAT activity in cell membranes, and activity was proportional to MGAT1 protein level and substrate concentration.\",\n      \"method\": \"Heterologous expression in insect cells, enzymatic activity assay with substrates oleoyl-CoA and monooleoylglycerol\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted enzymatic activity in vitro with dose-response to both substrates, foundational gene identification paper\",\n      \"pmids\": [\"12077311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PPARγ2 directly regulates the MGAT1 promoter to drive hepatic MGAT1 expression; MGAT1 overexpression enhances triglyceride synthesis in hepatocytes, and MGAT1 knockdown in vivo significantly reduces hepatic steatosis in high-fat-fed and ob/ob mice.\",\n      \"method\": \"Luciferase promoter assay, EMSA, ChIP, adenoviral overexpression, shRNA knockdown in mice\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (EMSA, ChIP, in vivo KD) in single study\",\n      \"pmids\": [\"22869740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MGAT1 localizes to the ER under basal conditions and co-localizes to lipid droplets under fatty acid-enriched conditions; both the N-terminal transmembrane domain and the catalytic HPHG motif are required for enzyme activity; MGAT1 interacts with DGAT2 to synergistically increase TAG biosynthesis and lipid droplet expansion.\",\n      \"method\": \"Subcellular fractionation/immunofluorescence, site-directed mutagenesis of catalytic motif, co-immunoprecipitation with DGAT2\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — localization by imaging with functional mutagenesis, single lab study\",\n      \"pmids\": [\"28347400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Lec1 CHO cells lacking GlcNAc-TI (encoded by Mgat1) harbor distinct coding-region mutations causing truncated MGAT1 protein; reversion of mutations by site-directed mutagenesis restores GlcNAc-TI activity and lectin binding, confirming MGAT1 encodes GlcNAc-TI.\",\n      \"method\": \"Sequencing of genomic DNA, site-directed mutagenesis reversion, enzymatic activity assay, lectin binding\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reversion mutagenesis with enzymatic activity readout proves causal link\",\n      \"pmids\": [\"12634323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Two point mutations in the Mgat1-encoded GlcNAc-TI (D212N disrupting the conserved DXD motif; R303W altering a structural element) reduce affinity for both UDP-GlcNAc and Man5GlcNAc2 substrates, causing the Lec1A phenotype; correction by site-directed mutagenesis restores activity, and the effects are rationalized by the crystal structure of rabbit GlcNAc-TI.\",\n      \"method\": \"Site-directed mutagenesis, enzymatic kinetic assay, crystal structure interpretation\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — active-site mutagenesis with kinetic analysis validated against crystal structure\",\n      \"pmids\": [\"11467936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The human MGAT1 gene is organized with at least two exons; multiple transcription start sites are present in a TATA-less, GC-rich promoter region; CAT reporter assays demonstrate the 5' flanking region of exon 1 drives transcription, consistent with housekeeping gene regulation.\",\n      \"method\": \"Genomic cloning, Northern blot, RNase protection, primer extension, RACE, transient transfection CAT assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods characterizing gene structure and promoter activity, single lab\",\n      \"pmids\": [\"9020882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Mgat1-null embryos lack complex N-glycans by E7.5 but retain them at E3.5 due to maternally derived glycoproteins; Mgat1 transcripts increase dramatically between E7.0 and E9.5 preceding embryonic lethality, establishing a temporal requirement for embryonically produced complex N-glycans after implantation.\",\n      \"method\": \"In situ RNA hybridization, lectin histochemistry on staged embryos\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization/expression analysis on null embryos with functional developmental consequence\",\n      \"pmids\": [\"8563140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Complex N-glycans in Mgat1-null blastocysts arise from maternally inherited wild-type Mgat1 mRNA that persists until around implantation (E5.5), after which the null phenotype becomes operative; identified by RT-PCR of individual PCR-genotyped blastocysts.\",\n      \"method\": \"PCR genotyping of individual blastocysts, RT-PCR, lectin binding (L-PHA)\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genotype-confirmed embryo analysis with functional lectin readout\",\n      \"pmids\": [\"9363433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Oocyte-specific deletion of Mgat1 (via ZP3-Cre) produces a thinner zona pellucida lacking complex N-glycans; mutant eggs can be fertilized and implant, but ~25% of resulting embryos are severely retarded, demonstrating that MGAT1-dependent complex N-glycans in oocytes are required for full developmental competence of the egg but not strictly for fertilization or blastogenesis.\",\n      \"method\": \"Conditional knockout (ZP3-Cre × Mgat1-flox), lectin staining, embryo phenotyping\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional genetic knockout with defined cellular and developmental phenotype, replicated across embryo cohorts\",\n      \"pmids\": [\"15509794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MGAT1 shRNA knockdown in HeLa and PC-3 tumor cells reduces branched N-glycan levels, inhibits cell migration and invasion (without affecting proliferation), alters focal adhesion and microfilament organization, and decreases primary tumor growth and lung metastasis in an orthotopic xenograft model.\",\n      \"method\": \"shRNA knockdown, invasion/migration assay, focal adhesion imaging, orthotopic mouse xenograft\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with multiple functional readouts in vitro and in vivo, single lab\",\n      \"pmids\": [\"22957033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Conditional deletion of Mgat1 in spermatogonia causes germ-cell-autonomous infertility; loss of complex N-glycans leads to premature upregulation of spermiogenesis genes and reduced ERK1/2 signaling; basigin (a germ-cell target of MGAT1) activates ERK1/2 in CHO cells but not in Lec1 CHO cells lacking MGAT1.\",\n      \"method\": \"Conditional knockout, Affymetrix gene expression array, IPA/GSEA bioinformatics, ERK1/2 phosphorylation assay in CHO vs Lec1 cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with pathway analysis and biochemical ERK signaling validation in isogenic cell lines\",\n      \"pmids\": [\"29386567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GnT1IP-L inhibits MGAT1 specifically in the Golgi via its luminal domain; ER retention of GnT1IP-L reduces inhibitory activity; dynamic FRET and BiFC assays show GnT1IP-L forms homomers in the ER and heteromers with MGAT1 in the Golgi, but not with MGAT2, MGAT3, MGAT4B, or MGAT5.\",\n      \"method\": \"ER-retention constructs, FRET, BiFC, enzymatic activity assays in transfected cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal approaches (FRET, BiFC, activity assay, subcellular retention) establish specific Golgi interaction mechanism\",\n      \"pmids\": [\"26371870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Zinc-finger nuclease (ZFN)-mediated disruption of Mgat1 in CHO cells prevents synthesis of complex N-glycans beyond Man5GlcNAc2, enabling production of recombinant proteins with homogeneous high-mannose glycoforms without impairing cell growth.\",\n      \"method\": \"ZFN genome editing, lectin binding, mass spectrometry glycan profiling\",\n      \"journal\": \"Journal of biotechnology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with glycan phenotype confirmation, tool development study\",\n      \"pmids\": [\"23777858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Elevated intracellular lactate activates XBP1s to upregulate MGAT1 transcription; lactate also interacts with the TOM70 mitochondrial import receptor to facilitate MGAT1 translocation into mitochondria, where MGAT1 drives N-glycosylation of progranulin (GRN) and HYOU1 to enhance Treg oxidative phosphorylation.\",\n      \"method\": \"Mitochondrial isolation, sequencing, XBP1s ChIP/reporter assay, TOM70 interaction assay, MGAT1 KD, Treg OXPHOS measurement, xenogeneic GvHD mouse model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in single study; unconventional mitochondrial localization warrants replication\",\n      \"pmids\": [\"39264847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Mgat1-dependent N-glycosylation of Drosophila immune cell membrane proteins is required for the cellular encapsulation response against parasitoid wasps; loss-of-function mutations in Mgat1 (among 8 N-glycosylation pathway genes) lead to defective, disintegrating capsules and reduced parasite resistance.\",\n      \"method\": \"Drosophila genetics (loss-of-function mutants), immune challenge assay, capsule morphology analysis, overexpression rescue\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Drosophila ortholog, genetic epistasis with defined immune phenotype; consistent with mammalian MGAT1 function\",\n      \"pmids\": [\"22829770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Neuronal expression of Drosophila Mgat1 in the CNS is required for normal locomotion and lifespan; knockdown in CNS neurons recapitulates Mgat1-null locomotor and lifespan defects; neuronal Mgat1 overexpression dramatically extends lifespan (up to 135%) correlating with increased GnT1 activity and oxidative stress resistance.\",\n      \"method\": \"Tissue-specific transgenic rescue and RNAi knockdown in Drosophila, GnT1 enzyme activity assay, oxidative stress assay, lifespan analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Drosophila ortholog, genetic rescue with biochemical (enzyme activity) validation\",\n      \"pmids\": [\"20457894\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MGAT1 encodes UDP-GlcNAc:α-3-D-mannoside β-1,2-N-acetylglucosaminyltransferase I (GlcNAc-TI), a medial-Golgi enzyme that catalyzes the first committed step converting high-mannose N-glycans to complex/hybrid N-glycans; it is transcriptionally regulated by PPARγ2 (in liver) and by XBP1s downstream of lactate signaling (in Tregs), localizes to the ER and lipid droplets (and under specific conditions to mitochondria), interacts physically with DGAT2 to promote triacylglycerol synthesis, is inhibited in the Golgi by GnT1IP-L via a luminal-domain heteromeric interaction, and is required for embryonic development, oocyte competence, spermatogenesis (via ERK signaling), immune cell function, and suppression of tumor cell invasion.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MGAT1 encodes two functionally distinct enzymes depending on context: UDP-GlcNAc:α-3-D-mannoside β-1,2-N-acetylglucosaminyltransferase I (GlcNAc-TI), a medial-Golgi glycosyltransferase that catalyzes the first committed step in converting high-mannose N-glycans to complex/hybrid N-glycans [PMID:12634323, PMID:11467936], and an acyl-CoA:monoacylglycerol acyltransferase (MGAT) that synthesizes diacylglycerol from monoacylglycerol and acyl-CoA to promote triacylglycerol biosynthesis [PMID:12077311]. In its lipid-metabolic role, MGAT1 localizes to the ER and lipid droplets, interacts physically with DGAT2 to synergistically expand TAG synthesis, and is transcriptionally regulated by PPARγ2 in liver, where its knockdown ameliorates hepatic steatosis [PMID:22869740, PMID:28347400]. In its glycosyltransferase role, MGAT1 is essential for embryonic development, oocyte competence, spermatogenesis via ERK1/2 signaling, immune cell encapsulation responses, and suppression of tumor cell invasion; it is specifically inhibited in the Golgi by GnT1IP-L through a luminal-domain heteromeric interaction and can be transcriptionally induced by XBP1s downstream of lactate signaling to drive mitochondrial N-glycosylation in regulatory T cells [PMID:8563140, PMID:15509794, PMID:29386567, PMID:26371870, PMID:39264847, PMID:22829770].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Establishing when MGAT1-dependent complex N-glycans first become essential in development: Mgat1-null embryos lose complex N-glycans by E7.5 (maternal glycoproteins sustain them until ~E5.5), linking embryonic lethality to the temporal onset of zygotic MGAT1 expression.\",\n      \"evidence\": \"In situ hybridization and lectin histochemistry on staged Mgat1-null mouse embryos\",\n      \"pmids\": [\"8563140\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific glycoprotein substrates whose complex N-glycans are required for post-implantation survival are not identified\", \"Mechanism of maternal mRNA clearance not characterized\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Confirmation that maternally derived wild-type Mgat1 mRNA persists until implantation (~E5.5) and accounts for complex N-glycans in null blastocysts, resolving the apparent paradox of normal early glycosylation in knockouts.\",\n      \"evidence\": \"RT-PCR on individual PCR-genotyped blastocysts with L-PHA lectin binding\",\n      \"pmids\": [\"9363433\", \"9020882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Translational efficiency of maternal versus zygotic mRNA not compared\", \"Gene regulatory elements beyond the proximal promoter remain uncharacterized\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defining the catalytic mechanism of MGAT1's glycosyltransferase activity: the conserved DXD motif (D212) and R303 are critical for substrate binding, with mutations at these sites causing the Lec1A phenotype, rationalizable by the GlcNAc-TI crystal structure.\",\n      \"evidence\": \"Site-directed mutagenesis with kinetic analysis of UDP-GlcNAc and Man5GlcNAc2 binding, interpreted against rabbit GlcNAc-TI crystal structure\",\n      \"pmids\": [\"11467936\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human MGAT1 crystal structure not yet solved\", \"Conformational dynamics upon substrate binding not examined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"MGAT1 was identified as encoding a second, unrelated enzymatic activity — acyl-CoA:monoacylglycerol acyltransferase — that synthesizes diacylglycerol, simultaneously establishing it as a key node in intestinal/hepatic lipid metabolism.\",\n      \"evidence\": \"Heterologous expression in insect cells with enzymatic activity assay using oleoyl-CoA and monooleoylglycerol substrates\",\n      \"pmids\": [\"12077311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between the glycosyltransferase (GnT-I) MGAT1 gene and the MGAT lipid enzyme MGAT1 gene — these are distinct genes that share the symbol in some nomenclatures; clarity on gene identity needed\", \"In vivo substrate specificity for different acyl-CoA and MAG species not fully profiled\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Definitive genetic proof that MGAT1 encodes GlcNAc-TI: reversion mutagenesis of Lec1 CHO cell mutations restored both enzymatic activity and lectin binding, confirming the causal gene-function relationship.\",\n      \"evidence\": \"Sequencing of Lec1 CHO genomic DNA, reversion by site-directed mutagenesis, enzymatic and lectin-binding assays\",\n      \"pmids\": [\"12634323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional compensatory glycosyltransferases exist in Lec1 cells not explored\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Oocyte-specific deletion revealed that MGAT1 complex N-glycans contribute to zona pellucida thickness and full developmental competence of the egg, but are not strictly required for fertilization.\",\n      \"evidence\": \"Conditional knockout (ZP3-Cre × Mgat1-flox), lectin staining, and embryo phenotyping\",\n      \"pmids\": [\"15509794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific zona pellucida glycoprotein targets of MGAT1 not identified\", \"Whether the ~25% embryonic defect reflects stochastic or deterministic mechanism unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Neuronal MGAT1 activity is a key determinant of organismal lifespan and locomotion in Drosophila, with overexpression extending lifespan up to 135% and conferring oxidative stress resistance — linking complex N-glycan biosynthesis to aging.\",\n      \"evidence\": \"CNS-specific transgenic rescue/RNAi in Drosophila with GnT1 enzyme activity measurement, oxidative stress and lifespan assays\",\n      \"pmids\": [\"20457894\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian relevance of neuronal MGAT1 lifespan extension not tested\", \"Neuronal glycoprotein substrates mediating the effect not identified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Multiple advances established MGAT1's roles in hepatic lipid metabolism and cancer: PPARγ2 directly transactivates the MGAT1 promoter to drive hepatic steatosis, MGAT1 knockdown suppresses tumor invasion and metastasis, and Drosophila Mgat1 is required for immune encapsulation.\",\n      \"evidence\": \"ChIP/EMSA/luciferase for PPARγ2 regulation with in vivo shRNA in mice; shRNA in HeLa/PC-3 cells with orthotopic xenograft; Drosophila loss-of-function immune challenge\",\n      \"pmids\": [\"22869740\", \"22957033\", \"22829770\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific surface glycoproteins mediating invasion suppression not identified\", \"Whether anti-metastatic effect is cell-type general or restricted to certain cancers unclear\", \"Mammalian immune cell phenotype of MGAT1 loss not tested in parallel\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"A specific Golgi-resident inhibitor (GnT1IP-L) was shown to selectively inhibit MGAT1 through luminal-domain heteromerization, revealing a dedicated regulatory mechanism for controlling the high-mannose-to-complex N-glycan switch.\",\n      \"evidence\": \"FRET, BiFC, ER-retention constructs, and enzymatic activity assays in transfected cells\",\n      \"pmids\": [\"26371870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts in which GnT1IP-L is upregulated to modulate MGAT1 remain undefined\", \"Structural basis of the heteromeric interaction not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"MGAT1's lipid-metabolic function was mechanistically elaborated: the enzyme localizes to ER basally and redistributes to lipid droplets under fatty acid loading; its catalytic HPHG motif and N-terminal transmembrane domain are essential; and physical interaction with DGAT2 synergistically enhances TAG synthesis.\",\n      \"evidence\": \"Immunofluorescence, subcellular fractionation, site-directed mutagenesis, co-immunoprecipitation with DGAT2\",\n      \"pmids\": [\"28347400\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reciprocal co-IP for DGAT2 interaction not shown\", \"Whether MGAT1-DGAT2 interaction is direct or bridged by other factors unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Conditional deletion in spermatogonia revealed that MGAT1-dependent complex N-glycans on basigin activate ERK1/2 signaling to properly time spermiogenesis gene expression, establishing a glycan-to-kinase signaling axis in male fertility.\",\n      \"evidence\": \"Conditional knockout in mouse spermatogonia, transcriptomics, ERK1/2 phosphorylation comparison in CHO vs Lec1 cells\",\n      \"pmids\": [\"29386567\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether basigin is the sole relevant MGAT1 substrate in germ cells is not established\", \"Downstream ERK targets mediating spermiogenesis timing not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"An unexpected mitochondrial role for MGAT1 was uncovered: lactate-activated XBP1s upregulates MGAT1, and lactate also facilitates MGAT1 import into mitochondria via TOM70, where it glycosylates progranulin and HYOU1 to enhance Treg oxidative phosphorylation.\",\n      \"evidence\": \"Mitochondrial isolation, XBP1s ChIP/reporter assay, TOM70 interaction assay, MGAT1 KD, Treg OXPHOS measurement, xenogeneic GvHD mouse model\",\n      \"pmids\": [\"39264847\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mitochondrial localization of MGAT1 has not been independently replicated\", \"How a Golgi glycosyltransferase accesses mitochondrial substrates mechanistically is not fully resolved\", \"Whether mitochondrial N-glycosylation by MGAT1 occurs in cell types beyond Tregs is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Open question: the structural basis of MGAT1 regulation by GnT1IP-L, the full repertoire of physiological glycoprotein substrates in different tissues, and the scope and mechanism of the reported mitochondrial localization remain to be defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal structure of human MGAT1 in complex with GnT1IP-L\", \"Comprehensive substrate identification across tissues lacking\", \"Independent confirmation of mitochondrial localization needed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 3, 4, 12]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [11, 4]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 4, 12, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 7, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [14, 13]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [8, 10]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"DGAT2\",\n      \"GnT1IP-L\",\n      \"TOM70\",\n      \"BSG\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}