{"gene":"GMDS","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":2007,"finding":"GMD (GDP-mannose 4,6-dehydratase) is an essential enzyme in the de novo GDP-fucose biosynthesis pathway; siRNA knockdown of GMDS in CHO antibody-producing cells reduced intracellular GDP-fucose and core fucosylation of antibody Fc oligosaccharides, demonstrating that GMDS and FUT8 collaborate synergistically in intracellular oligosaccharide fucosylation.","method":"siRNA loss-of-function, mRNA expression analysis, glycan mass spectrometry on antibody Fc","journal":"BMC biotechnology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal knockdown of GMDS and FUT8 with direct glycan readout, replicated across multiple siRNA sequences","pmids":["18047682"],"is_preprint":false},{"year":2007,"finding":"GMDS knockout CHO cells are completely devoid of intracellular GDP-fucose and produce fully non-fucosylated antibodies; fucosylation is rescued through the salvage pathway upon addition of exogenous L-fucose, confirming GMDS is the rate-limiting enzyme in the de novo GDP-fucose biosynthetic pathway.","method":"Gene knockout (CHO/DG44), HPLC measurement of GDP-fucose, glycan analysis of antibody products, L-fucose rescue experiment","journal":"Journal of biotechnology","confidence":"High","confidence_rationale":"Tier 1–2 — knockout with direct metabolite measurement and chemical rescue, multiple orthogonal methods in a single study","pmids":["17559959"],"is_preprint":false},{"year":2009,"finding":"Loss-of-function mutations in GMDS found in human colon cancer (HCT116 cells) result in virtually complete deficiency of cellular fucosylation; transfection of wild-type GMDS into HCT116 cells restored cellular fucosylation and rendered cells highly susceptible to TRAIL-induced apoptosis, while GMDS-deficient cells escaped NK cell-mediated tumor surveillance in vivo.","method":"Mutational analysis, wild-type GMDS transfection rescue, in vitro TRAIL apoptosis assay, in vivo xenograft transplantation into athymic mice with NK cell depletion, anti-TRAIL blocking antibody","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 2 — genetic rescue with multiple orthogonal functional readouts in vitro and in vivo, replicated in additional cancer cell lines and tissues","pmids":["19361506"],"is_preprint":false},{"year":2011,"finding":"GMDS deficiency inhibits formation of the secondary FADD-dependent complex II (comprising caspase-8 and cFLIP) downstream of TRAIL receptor and CD95 death-inducing signaling complex (DISC), without affecting primary DISC formation or caspase-8 recruitment/activation; this inhibition is independent of direct fucosylation of DR4 or DR5, as DR5-mediated apoptosis was also blocked despite DR5 not being fucosylated.","method":"Co-immunoprecipitation of DISC components, caspase-8 activity assays, DR4/DR5 fucosylation analysis, lectin pull-down, siRNA knockdown of GMDS","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic dissection of complex II formation by co-IP plus mutagenesis-equivalent loss-of-function, multiple orthogonal assays in one study","pmids":["22027835"],"is_preprint":false},{"year":2011,"finding":"In Drosophila, GMD (GDP-mannose dehydratase, ortholog of GMDS) activity and GDP-fucose levels are required to stabilize Notch protein; under low GMD expression, Notch degradation is mediated by OFUT1, demonstrating that the GDP-fucose/OFUT1 balance regulates Notch stability and signaling pathway activity.","method":"Drosophila genetics (mutants, UAS/Gal4 overexpression and knockdown), genetic epistasis with OFUT1, Notch protein level analysis, Notch Abruptex mutant analysis","journal":"Biological research","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis in Drosophila ortholog with defined molecular pathway (Notch/OFUT1), single lab","pmids":["21720678"],"is_preprint":false},{"year":2018,"finding":"Lentiviral shRNA-mediated knockdown of GMDS in human lung adenocarcinoma cells (A549 and H1299) impaired cell proliferation and colony formation, induced cell cycle arrest and apoptosis in vitro, and inhibited xenograft tumorigenesis in vivo; transcriptome analysis implicated the CASP8-CDKN1A axis as a downstream effector.","method":"Lentiviral shRNA knockdown, cell proliferation assay, colony formation assay, flow cytometry (cell cycle and apoptosis), xenograft mouse model, microarray transcriptome analysis","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 — clean KD with defined cellular phenotypes and in vivo validation, single lab","pmids":["29843634"],"is_preprint":false},{"year":2025,"finding":"A point mutation in GMDS in mice results in reduced double-positive, CD4 single-positive, and CD8 single-positive T cells in the thymus despite normal double-negative cell numbers; mixed bone marrow chimera experiments demonstrated a cell-intrinsic requirement for GMDS from the double-positive stage of T cell development onward, while B cell subsets were not affected.","method":"ENU mutagenesis mouse model, immunophenotyping by flow cytometry, Rag1 bone marrow reconstitution, mixed bone marrow chimera competitive transplantation","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — cell-intrinsic requirement confirmed by competitive bone marrow chimera, single lab","pmids":["40642090"],"is_preprint":false},{"year":2025,"finding":"CRISPR/Cas9 gmds haploinsufficiency in zebrafish leads to downregulation of stress response genes (including crystallins) and upregulation of cell death genes, retinal ganglion cell layer thinning, RGC loss, and reduced optic nerve head width, implicating GMDS-dependent fucosylation in the regulation of ocular stress response and glaucoma-related pathology.","method":"CRISPR/Cas9 zebrafish knockout (haploinsufficient), RNA-seq, histological/morphological analysis of eye","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR KO zebrafish ortholog with RNAseq and phenotypic readout, single lab","pmids":["40571142"],"is_preprint":false},{"year":2025,"finding":"Loss of gmds function in zebrafish increases neuromast hair cell number and accelerates hair cell regeneration after neomycin ablation; pharmacological Notch inhibition further enhanced regeneration in wild-type but less so in gmds mutants, indicating GMDS-dependent fucosylation partially suppresses hair cell regeneration through Notch signaling.","method":"CRISPR/Cas9 zebrafish gmds mutants, neomycin chemical ablation, hair cell counting, pharmacological Notch inhibition (gamma-secretase inhibitor), epistasis analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 — genetic and pharmacological epistasis in zebrafish ortholog, multiple orthogonal methods, single lab","pmids":["41097001"],"is_preprint":false},{"year":2020,"finding":"Knockout of Gmds in CHOZN cells depletes GDP-fucose biosynthesis via the de novo pathway, resulting in complete loss of fucose modification on recombinant antibody N-glycans and significantly enhanced FcγRIIIa binding and ADCC activity, demonstrating GMDS as the rate-limiting step in the de novo GDP-fucose pathway in mammalian cells.","method":"CRISPR/Cas9 knockout, glycan mass spectrometry, FcγRIIIa binding assay, ADCC assay","journal":"Biotechnology progress","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with direct glycan and functional FcγRIIIa/ADCC readouts, single lab","pmids":["32748555"],"is_preprint":false}],"current_model":"GMDS (GDP-mannose 4,6-dehydratase) catalyzes the first committed step of the de novo GDP-fucose biosynthesis pathway, and its activity is essential for cellular fucosylation of glycoproteins and glycolipids; loss of GMDS depletes intracellular GDP-fucose, abolishes core fucosylation of cell-surface proteins, impairs TRAIL/CD95 death receptor signaling by blocking secondary complex II (caspase-8/cFLIP) formation, enables tumor immune evasion from NK cell-mediated surveillance, regulates Notch protein stability (via the GDP-fucose/OFUT1 axis), and is cell-intrinsically required for T cell development beyond the double-negative thymic stage."},"narrative":{"teleology":[{"year":2007,"claim":"Establishing GMDS as the rate-limiting enzyme of de novo GDP-fucose biosynthesis resolved how mammalian cells generate the universal fucose donor nucleotide sugar.","evidence":"siRNA knockdown and gene knockout in CHO cells with direct GDP-fucose measurement, glycan mass spectrometry, and L-fucose salvage rescue","pmids":["18047682","17559959"],"confidence":"High","gaps":["Crystal structure–based catalytic mechanism in human GMDS not defined in these studies","Regulation of GMDS expression or enzymatic activity under physiological conditions unknown","Whether GMDS is rate-limiting in all mammalian cell types was not tested"]},{"year":2009,"claim":"Discovery that GMDS loss-of-function mutations occur naturally in human colon cancer and that restoring GMDS rescues TRAIL sensitivity and NK cell killing linked the fucosylation pathway to tumor immune evasion.","evidence":"Mutational analysis of HCT116 cells, wild-type GMDS transfection rescue, TRAIL apoptosis assay, in vivo xenograft with NK cell depletion","pmids":["19361506"],"confidence":"High","gaps":["The specific fucosylated target(s) mediating TRAIL sensitization were not identified","Frequency and spectrum of GMDS mutations across broader cancer cohorts not established","Whether fucosylation loss affects additional immune surveillance mechanisms beyond NK/TRAIL was untested"]},{"year":2011,"claim":"Mechanistic dissection revealed that GMDS deficiency blocks TRAIL and CD95 apoptosis at the level of secondary complex II (FADD/caspase-8/cFLIP) assembly rather than at primary DISC formation, and that this effect is independent of direct death receptor fucosylation.","evidence":"Co-immunoprecipitation of DISC and complex II components, caspase-8 activity assays, lectin pull-down for DR4/DR5 fucosylation status","pmids":["22027835"],"confidence":"High","gaps":["The identity of the fucosylated protein(s) required for complex II assembly remains unknown","Whether this mechanism operates in non-cancer primary cells was not examined"]},{"year":2011,"claim":"Genetic epistasis in Drosophila established that GMD/GDP-fucose levels regulate Notch protein stability through OFUT1, linking the fucosylation pathway to a major developmental signaling axis.","evidence":"Drosophila GMD mutants and UAS/Gal4 system, genetic epistasis with OFUT1, Notch protein and Abruptex mutant analysis","pmids":["21720678"],"confidence":"Medium","gaps":["Whether this Notch stability mechanism is conserved in mammalian GMDS/POFUT1 was not shown","Biochemical mechanism by which OFUT1 degrades unfucosylated Notch was not defined"]},{"year":2020,"claim":"CRISPR knockout of GMDS in mammalian CHO cells confirmed its role as the de novo pathway bottleneck and demonstrated that complete loss of Fc fucosylation enhances FcγRIIIa binding and ADCC, validating GMDS as a glycoengineering target.","evidence":"CRISPR/Cas9 knockout in CHOZN cells, glycan mass spectrometry, FcγRIIIa binding and ADCC assays","pmids":["32748555"],"confidence":"Medium","gaps":["Long-term stability of the afucosylated glycan phenotype in manufacturing-scale culture not assessed","Effects of GMDS loss on non-antibody glycoprotein function in the same cells not examined"]},{"year":2025,"claim":"A mouse ENU point mutation in Gmds revealed a cell-intrinsic requirement for GMDS-dependent fucosylation in T cell development from the double-negative to double-positive transition, while B cell development was unaffected.","evidence":"ENU mutagenesis, immunophenotyping by flow cytometry, competitive mixed bone marrow chimera transplantation","pmids":["40642090"],"confidence":"Medium","gaps":["The fucosylated substrate(s) essential for the DN-to-DP transition remain unidentified","Whether this reflects Notch fucosylation requirements (known for thymocyte development) was not tested","Only a single point mutation was studied; full knockout phenotype in mice is unknown"]},{"year":2025,"claim":"Studies in zebrafish gmds mutants extended the Notch connection by showing that GMDS-dependent fucosylation suppresses neuromast hair cell regeneration partially through Notch signaling, and separately implicated GMDS haploinsufficiency in retinal ganglion cell loss and ocular stress response.","evidence":"CRISPR/Cas9 zebrafish knockouts, neomycin hair cell ablation with pharmacological Notch inhibition epistasis, RNA-seq and histological analysis of eye","pmids":["41097001","40571142"],"confidence":"Medium","gaps":["Direct demonstration that Notch is hypofucosylated in gmds zebrafish mutants was not provided","Whether the ocular phenotype is Notch-dependent or reflects a distinct fucosylation target is unknown","Mammalian relevance of the hair cell and RGC phenotypes has not been tested"]},{"year":null,"claim":"The identity of the specific fucosylated substrate(s) that mediate GMDS-dependent effects on death receptor complex II assembly, T cell development, and Notch signaling in mammals remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct identification of the fucosylated target required for complex II formation","No structural or enzymological study of human GMDS regulation in the timeline","Tissue-specific physiological consequences of GMDS loss in a full mammalian knockout model have not been reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016829","term_label":"lyase activity","supporting_discovery_ids":[0,1,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,1,9]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,3]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,8]}],"complexes":[],"partners":["FUT8","OFUT1"],"other_free_text":[]},"mechanistic_narrative":"GMDS (GDP-mannose 4,6-dehydratase) catalyzes the first and rate-limiting step of the de novo GDP-fucose biosynthesis pathway, and its loss completely abolishes intracellular GDP-fucose and cellular fucosylation, which can be rescued by exogenous L-fucose via the salvage pathway [PMID:17559959, PMID:18047682, PMID:32748555]. GMDS-dependent fucosylation is required for TRAIL- and CD95-induced apoptosis through formation of the secondary FADD/caspase-8/cFLIP complex (complex II), independently of direct death receptor fucosylation, and loss-of-function GMDS mutations in colon cancer cells enable escape from NK cell–mediated immune surveillance [PMID:19361506, PMID:22027835]. GMDS regulates Notch protein stability through the GDP-fucose/OFUT1 axis, as demonstrated by genetic epistasis in Drosophila and pharmacological Notch inhibition epistasis in zebrafish, where loss of gmds increases neuromast hair cell number and accelerates regeneration [PMID:21720678, PMID:41097001]. GMDS is cell-intrinsically required for T cell development beyond the double-negative thymic stage, as shown by competitive bone marrow chimera experiments in mice carrying a point mutation in Gmds [PMID:40642090]."},"prefetch_data":{"uniprot":{"accession":"O60547","full_name":"GDP-mannose 4,6 dehydratase","aliases":["GDP-D-mannose dehydratase","GMD"],"length_aa":372,"mass_kda":42.0,"function":"Catalyzes the conversion of GDP-D-mannose to GDP-4-dehydro-6-deoxy-D-mannose","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O60547/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GMDS","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TSR2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/GMDS","total_profiled":1310},"omim":[{"mim_id":"612582","title":"CHROMOSOME 6pter-p24 DELETION SYNDROME","url":"https://www.omim.org/entry/612582"},{"mim_id":"602884","title":"GDP-MANNOSE 4,6-DEHYDRATASE; GMDS","url":"https://www.omim.org/entry/602884"},{"mim_id":"601090","title":"FORKHEAD BOX C1; FOXC1","url":"https://www.omim.org/entry/601090"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"intestine","ntpm":99.8},{"tissue":"salivary gland","ntpm":99.4},{"tissue":"stomach 1","ntpm":91.7}],"url":"https://www.proteinatlas.org/search/GMDS"},"hgnc":{"alias_symbol":["GMD","SDR3E1"],"prev_symbol":[]},"alphafold":{"accession":"O60547","domains":[{"cath_id":"3.40.50.720","chopping":"24-213_250-277_329-349","consensus_level":"high","plddt":97.1032,"start":24,"end":349},{"cath_id":"3.90.25.10","chopping":"218-240_281-325_360-367","consensus_level":"medium","plddt":97.9701,"start":218,"end":367}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60547","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60547-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60547-F1-predicted_aligned_error_v6.png","plddt_mean":94.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GMDS","jax_strain_url":"https://www.jax.org/strain/search?query=GMDS"},"sequence":{"accession":"O60547","fasta_url":"https://rest.uniprot.org/uniprotkb/O60547.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60547/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60547"}},"corpus_meta":[{"pmid":"15613389","id":"PMC_15613389","title":"GMD@CSB.DB: 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PCC 6803","date":"2025-03-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.27.645739","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19052,"output_tokens":2619,"usd":0.04822},"stage2":{"model":"claude-opus-4-6","input_tokens":5941,"output_tokens":2295,"usd":0.13062},"total_usd":0.17884,"stage1_batch_id":"msgbatch_01DzrsgVgYngY1hvM3DU1yF2","stage2_batch_id":"msgbatch_01KA9b7iRzKFdhoBUT7vCvSe","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"GMD (GDP-mannose 4,6-dehydratase) is an essential enzyme in the de novo GDP-fucose biosynthesis pathway; siRNA knockdown of GMDS in CHO antibody-producing cells reduced intracellular GDP-fucose and core fucosylation of antibody Fc oligosaccharides, demonstrating that GMDS and FUT8 collaborate synergistically in intracellular oligosaccharide fucosylation.\",\n      \"method\": \"siRNA loss-of-function, mRNA expression analysis, glycan mass spectrometry on antibody Fc\",\n      \"journal\": \"BMC biotechnology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal knockdown of GMDS and FUT8 with direct glycan readout, replicated across multiple siRNA sequences\",\n      \"pmids\": [\"18047682\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GMDS knockout CHO cells are completely devoid of intracellular GDP-fucose and produce fully non-fucosylated antibodies; fucosylation is rescued through the salvage pathway upon addition of exogenous L-fucose, confirming GMDS is the rate-limiting enzyme in the de novo GDP-fucose biosynthetic pathway.\",\n      \"method\": \"Gene knockout (CHO/DG44), HPLC measurement of GDP-fucose, glycan analysis of antibody products, L-fucose rescue experiment\",\n      \"journal\": \"Journal of biotechnology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — knockout with direct metabolite measurement and chemical rescue, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"17559959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss-of-function mutations in GMDS found in human colon cancer (HCT116 cells) result in virtually complete deficiency of cellular fucosylation; transfection of wild-type GMDS into HCT116 cells restored cellular fucosylation and rendered cells highly susceptible to TRAIL-induced apoptosis, while GMDS-deficient cells escaped NK cell-mediated tumor surveillance in vivo.\",\n      \"method\": \"Mutational analysis, wild-type GMDS transfection rescue, in vitro TRAIL apoptosis assay, in vivo xenograft transplantation into athymic mice with NK cell depletion, anti-TRAIL blocking antibody\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue with multiple orthogonal functional readouts in vitro and in vivo, replicated in additional cancer cell lines and tissues\",\n      \"pmids\": [\"19361506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GMDS deficiency inhibits formation of the secondary FADD-dependent complex II (comprising caspase-8 and cFLIP) downstream of TRAIL receptor and CD95 death-inducing signaling complex (DISC), without affecting primary DISC formation or caspase-8 recruitment/activation; this inhibition is independent of direct fucosylation of DR4 or DR5, as DR5-mediated apoptosis was also blocked despite DR5 not being fucosylated.\",\n      \"method\": \"Co-immunoprecipitation of DISC components, caspase-8 activity assays, DR4/DR5 fucosylation analysis, lectin pull-down, siRNA knockdown of GMDS\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic dissection of complex II formation by co-IP plus mutagenesis-equivalent loss-of-function, multiple orthogonal assays in one study\",\n      \"pmids\": [\"22027835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In Drosophila, GMD (GDP-mannose dehydratase, ortholog of GMDS) activity and GDP-fucose levels are required to stabilize Notch protein; under low GMD expression, Notch degradation is mediated by OFUT1, demonstrating that the GDP-fucose/OFUT1 balance regulates Notch stability and signaling pathway activity.\",\n      \"method\": \"Drosophila genetics (mutants, UAS/Gal4 overexpression and knockdown), genetic epistasis with OFUT1, Notch protein level analysis, Notch Abruptex mutant analysis\",\n      \"journal\": \"Biological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in Drosophila ortholog with defined molecular pathway (Notch/OFUT1), single lab\",\n      \"pmids\": [\"21720678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Lentiviral shRNA-mediated knockdown of GMDS in human lung adenocarcinoma cells (A549 and H1299) impaired cell proliferation and colony formation, induced cell cycle arrest and apoptosis in vitro, and inhibited xenograft tumorigenesis in vivo; transcriptome analysis implicated the CASP8-CDKN1A axis as a downstream effector.\",\n      \"method\": \"Lentiviral shRNA knockdown, cell proliferation assay, colony formation assay, flow cytometry (cell cycle and apoptosis), xenograft mouse model, microarray transcriptome analysis\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KD with defined cellular phenotypes and in vivo validation, single lab\",\n      \"pmids\": [\"29843634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A point mutation in GMDS in mice results in reduced double-positive, CD4 single-positive, and CD8 single-positive T cells in the thymus despite normal double-negative cell numbers; mixed bone marrow chimera experiments demonstrated a cell-intrinsic requirement for GMDS from the double-positive stage of T cell development onward, while B cell subsets were not affected.\",\n      \"method\": \"ENU mutagenesis mouse model, immunophenotyping by flow cytometry, Rag1 bone marrow reconstitution, mixed bone marrow chimera competitive transplantation\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-intrinsic requirement confirmed by competitive bone marrow chimera, single lab\",\n      \"pmids\": [\"40642090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRISPR/Cas9 gmds haploinsufficiency in zebrafish leads to downregulation of stress response genes (including crystallins) and upregulation of cell death genes, retinal ganglion cell layer thinning, RGC loss, and reduced optic nerve head width, implicating GMDS-dependent fucosylation in the regulation of ocular stress response and glaucoma-related pathology.\",\n      \"method\": \"CRISPR/Cas9 zebrafish knockout (haploinsufficient), RNA-seq, histological/morphological analysis of eye\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO zebrafish ortholog with RNAseq and phenotypic readout, single lab\",\n      \"pmids\": [\"40571142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of gmds function in zebrafish increases neuromast hair cell number and accelerates hair cell regeneration after neomycin ablation; pharmacological Notch inhibition further enhanced regeneration in wild-type but less so in gmds mutants, indicating GMDS-dependent fucosylation partially suppresses hair cell regeneration through Notch signaling.\",\n      \"method\": \"CRISPR/Cas9 zebrafish gmds mutants, neomycin chemical ablation, hair cell counting, pharmacological Notch inhibition (gamma-secretase inhibitor), epistasis analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic and pharmacological epistasis in zebrafish ortholog, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"41097001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Knockout of Gmds in CHOZN cells depletes GDP-fucose biosynthesis via the de novo pathway, resulting in complete loss of fucose modification on recombinant antibody N-glycans and significantly enhanced FcγRIIIa binding and ADCC activity, demonstrating GMDS as the rate-limiting step in the de novo GDP-fucose pathway in mammalian cells.\",\n      \"method\": \"CRISPR/Cas9 knockout, glycan mass spectrometry, FcγRIIIa binding assay, ADCC assay\",\n      \"journal\": \"Biotechnology progress\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with direct glycan and functional FcγRIIIa/ADCC readouts, single lab\",\n      \"pmids\": [\"32748555\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GMDS (GDP-mannose 4,6-dehydratase) catalyzes the first committed step of the de novo GDP-fucose biosynthesis pathway, and its activity is essential for cellular fucosylation of glycoproteins and glycolipids; loss of GMDS depletes intracellular GDP-fucose, abolishes core fucosylation of cell-surface proteins, impairs TRAIL/CD95 death receptor signaling by blocking secondary complex II (caspase-8/cFLIP) formation, enables tumor immune evasion from NK cell-mediated surveillance, regulates Notch protein stability (via the GDP-fucose/OFUT1 axis), and is cell-intrinsically required for T cell development beyond the double-negative thymic stage.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GMDS (GDP-mannose 4,6-dehydratase) catalyzes the first and rate-limiting step of the de novo GDP-fucose biosynthesis pathway, and its loss completely abolishes intracellular GDP-fucose and cellular fucosylation, which can be rescued by exogenous L-fucose via the salvage pathway [PMID:17559959, PMID:18047682, PMID:32748555]. GMDS-dependent fucosylation is required for TRAIL- and CD95-induced apoptosis through formation of the secondary FADD/caspase-8/cFLIP complex (complex II), independently of direct death receptor fucosylation, and loss-of-function GMDS mutations in colon cancer cells enable escape from NK cell–mediated immune surveillance [PMID:19361506, PMID:22027835]. GMDS regulates Notch protein stability through the GDP-fucose/OFUT1 axis, as demonstrated by genetic epistasis in Drosophila and pharmacological Notch inhibition epistasis in zebrafish, where loss of gmds increases neuromast hair cell number and accelerates regeneration [PMID:21720678, PMID:41097001]. GMDS is cell-intrinsically required for T cell development beyond the double-negative thymic stage, as shown by competitive bone marrow chimera experiments in mice carrying a point mutation in Gmds [PMID:40642090].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing GMDS as the rate-limiting enzyme of de novo GDP-fucose biosynthesis resolved how mammalian cells generate the universal fucose donor nucleotide sugar.\",\n      \"evidence\": \"siRNA knockdown and gene knockout in CHO cells with direct GDP-fucose measurement, glycan mass spectrometry, and L-fucose salvage rescue\",\n      \"pmids\": [\"18047682\", \"17559959\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Crystal structure–based catalytic mechanism in human GMDS not defined in these studies\",\n        \"Regulation of GMDS expression or enzymatic activity under physiological conditions unknown\",\n        \"Whether GMDS is rate-limiting in all mammalian cell types was not tested\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that GMDS loss-of-function mutations occur naturally in human colon cancer and that restoring GMDS rescues TRAIL sensitivity and NK cell killing linked the fucosylation pathway to tumor immune evasion.\",\n      \"evidence\": \"Mutational analysis of HCT116 cells, wild-type GMDS transfection rescue, TRAIL apoptosis assay, in vivo xenograft with NK cell depletion\",\n      \"pmids\": [\"19361506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The specific fucosylated target(s) mediating TRAIL sensitization were not identified\",\n        \"Frequency and spectrum of GMDS mutations across broader cancer cohorts not established\",\n        \"Whether fucosylation loss affects additional immune surveillance mechanisms beyond NK/TRAIL was untested\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Mechanistic dissection revealed that GMDS deficiency blocks TRAIL and CD95 apoptosis at the level of secondary complex II (FADD/caspase-8/cFLIP) assembly rather than at primary DISC formation, and that this effect is independent of direct death receptor fucosylation.\",\n      \"evidence\": \"Co-immunoprecipitation of DISC and complex II components, caspase-8 activity assays, lectin pull-down for DR4/DR5 fucosylation status\",\n      \"pmids\": [\"22027835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The identity of the fucosylated protein(s) required for complex II assembly remains unknown\",\n        \"Whether this mechanism operates in non-cancer primary cells was not examined\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Genetic epistasis in Drosophila established that GMD/GDP-fucose levels regulate Notch protein stability through OFUT1, linking the fucosylation pathway to a major developmental signaling axis.\",\n      \"evidence\": \"Drosophila GMD mutants and UAS/Gal4 system, genetic epistasis with OFUT1, Notch protein and Abruptex mutant analysis\",\n      \"pmids\": [\"21720678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether this Notch stability mechanism is conserved in mammalian GMDS/POFUT1 was not shown\",\n        \"Biochemical mechanism by which OFUT1 degrades unfucosylated Notch was not defined\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"CRISPR knockout of GMDS in mammalian CHO cells confirmed its role as the de novo pathway bottleneck and demonstrated that complete loss of Fc fucosylation enhances FcγRIIIa binding and ADCC, validating GMDS as a glycoengineering target.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in CHOZN cells, glycan mass spectrometry, FcγRIIIa binding and ADCC assays\",\n      \"pmids\": [\"32748555\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Long-term stability of the afucosylated glycan phenotype in manufacturing-scale culture not assessed\",\n        \"Effects of GMDS loss on non-antibody glycoprotein function in the same cells not examined\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A mouse ENU point mutation in Gmds revealed a cell-intrinsic requirement for GMDS-dependent fucosylation in T cell development from the double-negative to double-positive transition, while B cell development was unaffected.\",\n      \"evidence\": \"ENU mutagenesis, immunophenotyping by flow cytometry, competitive mixed bone marrow chimera transplantation\",\n      \"pmids\": [\"40642090\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The fucosylated substrate(s) essential for the DN-to-DP transition remain unidentified\",\n        \"Whether this reflects Notch fucosylation requirements (known for thymocyte development) was not tested\",\n        \"Only a single point mutation was studied; full knockout phenotype in mice is unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Studies in zebrafish gmds mutants extended the Notch connection by showing that GMDS-dependent fucosylation suppresses neuromast hair cell regeneration partially through Notch signaling, and separately implicated GMDS haploinsufficiency in retinal ganglion cell loss and ocular stress response.\",\n      \"evidence\": \"CRISPR/Cas9 zebrafish knockouts, neomycin hair cell ablation with pharmacological Notch inhibition epistasis, RNA-seq and histological analysis of eye\",\n      \"pmids\": [\"41097001\", \"40571142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct demonstration that Notch is hypofucosylated in gmds zebrafish mutants was not provided\",\n        \"Whether the ocular phenotype is Notch-dependent or reflects a distinct fucosylation target is unknown\",\n        \"Mammalian relevance of the hair cell and RGC phenotypes has not been tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the specific fucosylated substrate(s) that mediate GMDS-dependent effects on death receptor complex II assembly, T cell development, and Notch signaling in mammals remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct identification of the fucosylated target required for complex II formation\",\n        \"No structural or enzymological study of human GMDS regulation in the timeline\",\n        \"Tissue-specific physiological consequences of GMDS loss in a full mammalian knockout model have not been reported\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016829\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 1, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"FUT8\",\n      \"OFUT1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}