{"gene":"DEGS1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1997,"finding":"MLD (DEGS1) was cloned as a member of the membrane fatty acid desaturase gene family, containing three consensus histidine-rich motifs (HX3H, HX2HH, HX2HHXFP) characteristic of membrane fatty acid desaturases. The protein is extractable from particulate fractions only with detergent (not salt or urea), is widely expressed in human tissues, and localizes to the endoplasmic reticulum. Overexpression of MLD inhibited EGF receptor biosynthesis without affecting PDGF receptor expression.","method":"Molecular cloning, cell fractionation (detergent/salt/urea extraction), immunolocalization to ER, co-transfection overexpression assay","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct fractionation and localization experiments, overexpression functional assay, single lab with multiple orthogonal methods","pmids":["9188692"],"is_preprint":false},{"year":2012,"finding":"DES1 (DEGS1) was identified as a retinol isomerase (isomerase-2) in retinal Müller glial cells. DES1 co-immunoprecipitates with CRALBP in Müller cells. Purified DES1 showed high isomerase-2 activity in vitro in the presence of appropriate cofactors. RNAi knockdown of DES1 reduced isomerase-2 activity in cultured Müller cells. Adenoviral DES1 gene therapy partially rescued biochemical and physiological phenotypes in Rpe65−/− mice.","method":"Co-immunoprecipitation, in vitro isomerase activity assay with purified protein, RNAi knockdown, adenoviral gene therapy rescue in Rpe65−/− mice","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — purified protein in vitro activity, co-IP, RNAi knockdown, and in vivo rescue, multiple orthogonal methods in a single study","pmids":["23143414"],"is_preprint":false},{"year":2014,"finding":"DEGS1 is the desaturase catalyzing the last step in the de novo ceramide biosynthetic pathway (converting dihydroceramide to ceramide). Pharmacological or genetic ablation of DEGS1 in preadipocytes elevated dihydroceramide content, prevented adipogenesis, decreased lipid accumulation, and increased oxidative stress and cell death, establishing DEGS1 as a regulator of adipocyte differentiation through ceramide/dihydroceramide balance.","method":"Pharmacological inhibition and genetic knockdown (loss-of-function), lipid mass spectrometry, cell differentiation and viability assays, in vivo pharmacological inhibition","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — both pharmacological and genetic loss-of-function with specific lipid and cellular phenotype readouts, replicated in vivo","pmids":["25352638"],"is_preprint":false},{"year":2019,"finding":"Biallelic loss-of-function mutations in DEGS1, encoding C4-dihydroceramide desaturase, cause hypomyelinating leukodystrophy. Patient fibroblasts and muscle showed marked accumulation of the substrate dihydroceramide (DhCer) and increased DhCer/Cer ratios. Disease modeling in zebrafish confirmed the phenotype. Fingolimod (which inhibits ceramide synthase, one step prior to DEGS1) reduced DhCer/Cer imbalance and locomotor disability and increased myelinating oligodendrocytes in zebrafish, establishing the enzymatic pathway position of DEGS1.","method":"Whole-exome sequencing, lipidomics in patient fibroblasts and muscle, zebrafish knockdown model, pharmacological rescue with fingolimod","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — lipidomics in patient material, zebrafish loss-of-function model, pharmacological epistasis rescue, replicated by independent concurrent study (PMID:30620338)","pmids":["30620337"],"is_preprint":false},{"year":2019,"finding":"A homozygous p.Ala280Val variant in DEGS1 causes a multisystem neurological disorder with elevated dihydro-sphingolipid species. DEGS1 enzymatic activity in patient fibroblasts was reduced by ~80%. CRISPR/Cas9 DEGS1-knockout cells and pharmacological DEGS1 inhibition recapitulated the dihydro-sphingolipid accumulation. An atypical sphingosine isomer was detected in patient plasma and cells expressing mutant DEGS1, suggesting a potentially neurotoxic metabolite.","method":"Whole-exome sequencing, lipidomics in patient fibroblasts and plasma, enzymatic activity assay, CRISPR/Cas9 knockout, pharmacological inhibition","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — enzymatic activity assay, CRISPR KO, pharmacological inhibition, and lipidomics all converge in a single rigorous study","pmids":["30620338"],"is_preprint":false},{"year":2019,"finding":"A rare DEGS1 missense variant L175Q (Hispanic ancestry-specific) is associated with large increases in plasma dihydroceramides and dramatically reduced indexes of DEGS1 enzymatic activity in heterozygous carriers. CRISPR/Cas9 editing of the L175Q variant into HepG2 cells confirmed partial loss of DEGS1 function.","method":"Population genomics, plasma lipidomics, enzymatic activity assay, CRISPR/Cas9 genome editing in HepG2 cells","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — enzymatic activity assay plus CRISPR functional validation, independent of clinical studies, multiple orthogonal methods in one study","pmids":["31227640"],"is_preprint":false},{"year":2019,"finding":"Conditional knockout of DEGS1 (Des1) specifically in retinal Müller cells did not impair cone visual pigment regeneration or dark adaptation in mice, but slightly accelerated the rate of cone phototransduction termination. This result indicates that Müller cell DEGS1 expression is not required for cone visual cycle function.","method":"Conditional knockout (Pdgfrα-Cre × floxed Des1 on Gnat1−/− background), electroretinography, retinal histology, enzymatic activity assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with isolated cone physiological recordings and enzyme activity confirmation, single lab but rigorous design","pmids":["30645148"],"is_preprint":false},{"year":2011,"finding":"Myristic acid specifically increases native DEGS1 (DES1) enzymatic activity in cultured rat hepatocytes through N-myristoylation. The wild-type myristoylable form of recombinant DES1 localizes to both the ER and mitochondria, whereas a non-myristoylable mutant (N-terminal Gly→Ala) is almost exclusively in the ER. Myristic acid-increased DEGS1 activity was not due to increased mRNA or protein levels and slightly enhanced apoptosis.","method":"N-terminal myristoylation mutagenesis (Gly→Ala), subcellular fractionation, enzymatic activity assay in hepatocytes, confocal localization","journal":"Lipids","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct mutagenesis of myristoylation site with subcellular fractionation and enzymatic activity readout, multiple orthogonal methods, single lab","pmids":["22139871"],"is_preprint":false},{"year":2023,"finding":"DEGS1 is a mitochondria-associated endoplasmic reticulum membrane (MAM)-resident enzyme, refining prior ER-only localization. DEGS1 deficiency (patient fibroblasts) disrupts MAM core functions: (a) mitochondrial dynamics — hyperfused mitochondrial network with decreased DRP1 activation; (b) cholesterol metabolism — impaired SOAT activity and decreased cholesteryl esters; (c) phospholipid metabolism — increased phosphatidic acid and phosphatidylserine, decreased phosphatidylethanolamine; (d) lipid droplet biogenesis — increased size and number. Increased mitochondrial superoxide and impaired mitochondrial respiration were also detected in patient muscle.","method":"Patient fibroblast studies, multiomics (proteomics, lipidomics, metabolomics), enzymatic assays (SOAT activity), mitochondrial morphology imaging, superoxide detection, muscle biopsy respirometry","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiomics plus enzymatic assays plus functional readouts in patient-derived cells and tissue, multiple orthogonal methods converging on MAM dysfunction","pmids":["36951944"],"is_preprint":false},{"year":2022,"finding":"DES1 (DEGS1) is necessary and sufficient for anchorage-independent survival (AIS) downstream of HER2-driven glucose uptake and metabolism. DES1 knockdown abolished HER2-driven AIS; DES1 overexpression was sufficient to drive AIS and in vitro tumorigenicity. DEGS1 thus acts as a transducer linking HER2-driven glucose metabolic signals to ceramide synthesis and cancer cell survival.","method":"RNAi knockdown, overexpression, anchorage-independent growth assays, HER2 pathway epistasis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function experiments with defined cellular phenotype, single lab, pathway placement by epistasis","pmids":["36165222"],"is_preprint":false},{"year":2023,"finding":"Two novel DEGS1 variants near the C-terminus were characterized; structural modeling predicted a substrate-binding site. A regulatory link between DEGS1 and fatty acid desaturase 3 (FADS3) was proposed based on detection of the atypical SPB 18:1(14Z);O2 metabolite in patients with pathogenic DEGS1 variants but not in those with benign variants, establishing SPB 18:1(14Z);O2 as a specific biomarker of DEGS1 loss of function.","method":"Patient plasma lipidomics, structural modeling of DEGS1, bioinformatic analysis of FADS3 regulatory link","journal":"Journal of lipid research","confidence":"Low","confidence_rationale":"Tier 3–4 / Weak — lipidomics in patient plasma plus computational structural modeling; no direct enzymatic or binding assay confirming substrate site or FADS3 interaction","pmids":["37890668"],"is_preprint":false},{"year":1998,"finding":"The Des-1 protein in Drosophila melanogaster (an ortholog with six predicted transmembrane domains) is required for central spindle assembly and cytokinesis during male meiosis. Des-1 colocalizes with mitochondria throughout meiosis, associates with the spindle apparatus during anaphase/telophase, and localizes to the contractile ring. Loss of des-1 causes male sterility from cytokinesis failure.","method":"P-element mutagenesis, affinity-purified antibody immunolocalization in spermatocytes, phenotypic analysis of meiotic end products","journal":"Molecular & general genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with defined cytokinesis phenotype, direct protein immunolocalization; Drosophila ortholog, single lab","pmids":["9819060"],"is_preprint":false}],"current_model":"DEGS1 encodes dihydroceramide desaturase-1, an endoplasmic reticulum/MAM-resident enzyme that catalyzes the final step of de novo ceramide biosynthesis (introduction of the Δ4-trans double bond converting dihydroceramide to ceramide); its activity is enhanced by N-myristoylation which also redirects a fraction of the enzyme to mitochondria, and DEGS1 deficiency disrupts MAM integrity (mitochondrial dynamics, cholesterol/phospholipid metabolism, lipid droplet biogenesis), causes hypomyelinating leukodystrophy through dihydroceramide/ceramide imbalance, and acts as a downstream effector of HER2-driven glucose metabolism to support anchorage-independent tumor cell survival."},"narrative":{"mechanistic_narrative":"DEGS1 encodes a membrane fatty acid desaturase that catalyzes the final step of de novo ceramide biosynthesis, introducing the Δ4 double bond that converts dihydroceramide to ceramide [PMID:25352638, PMID:30620337]. Cloned as a member of the membrane fatty acid desaturase family bearing three conserved histidine-rich motifs, it is an integral membrane protein extractable only with detergent and was initially localized to the endoplasmic reticulum [PMID:9188692]; subsequent work refined this to a mitochondria-associated ER membrane (MAM) residence, where DEGS1 activity supports MAM core functions including mitochondrial dynamics, cholesterol esterification, phospholipid balance, and lipid droplet biogenesis [PMID:36951944]. Enzyme activity is enhanced by N-myristoylation, which also redirects a fraction of the protein from ER to mitochondria [PMID:22139871]. Loss of DEGS1 function — pharmacological, genetic, or via disease-associated variants — elevates dihydroceramide and raises the dihydroceramide/ceramide ratio, blocking adipocyte differentiation and increasing oxidative stress and cell death [PMID:25352638], and DEGS1 also acts as a downstream effector linking HER2-driven glucose metabolism to anchorage-independent tumor cell survival [PMID:36165222]. Biallelic loss-of-function mutations in DEGS1 cause hypomyelinating leukodystrophy and related multisystem neurological disease driven by dihydroceramide/ceramide imbalance, with the upstream ceramide synthase inhibitor fingolimod correcting the imbalance and myelination defect [PMID:30620337, PMID:30620338]. A reported retinol isomerase activity in retinal Müller glia [PMID:23143414] was not supported physiologically, as Müller-cell-specific DEGS1 deletion left the cone visual cycle intact [PMID:30645148].","teleology":[{"year":1997,"claim":"Establishing the molecular identity of DEGS1 answered whether this gene encoded a bona fide membrane desaturase and where it acted in the cell.","evidence":"Molecular cloning, detergent/salt/urea fractionation, ER immunolocalization, and overexpression in cells","pmids":["9188692"],"confidence":"Medium","gaps":["Did not identify the enzymatic substrate or reaction","EGF receptor biosynthesis effect mechanism unexplained","No structural model of the catalytic site"]},{"year":2011,"claim":"Identifying N-myristoylation as a regulator addressed how DEGS1 activity and subcellular distribution are controlled post-translationally.","evidence":"N-terminal Gly→Ala myristoylation mutant, subcellular fractionation, confocal imaging, and enzyme activity in rat hepatocytes","pmids":["22139871"],"confidence":"High","gaps":["Functional consequence of the mitochondrial enzyme pool not resolved","Did not establish whether myristoylation is dynamically regulated in vivo"]},{"year":2012,"claim":"A proposed retinol isomerase role tested whether DEGS1 has a function beyond sphingolipid metabolism in the visual cycle.","evidence":"Co-IP with CRALBP, in vitro isomerase assay with purified protein, RNAi, and adenoviral rescue in Rpe65−/− mice","pmids":["23143414"],"confidence":"High","gaps":["Physiological requirement in vivo not demonstrated","Relationship to the canonical desaturase activity unclear"]},{"year":2014,"claim":"Defining DEGS1 as the terminal dihydroceramide desaturase placed the enzyme firmly in de novo ceramide biosynthesis and linked it to cellular differentiation.","evidence":"Pharmacological and genetic loss-of-function in preadipocytes, lipid mass spectrometry, differentiation and viability assays, in vivo inhibition","pmids":["25352638"],"confidence":"High","gaps":["Mechanism connecting dihydroceramide accumulation to oxidative stress not detailed","Tissue-specificity of the adipogenic effect not addressed"]},{"year":2019,"claim":"Patient genetics and functional validation established DEGS1 loss of function as a Mendelian cause of hypomyelinating leukodystrophy and multisystem neurological disease, defining the pathogenic mechanism as dihydroceramide/ceramide imbalance.","evidence":"Whole-exome sequencing, patient lipidomics, CRISPR/Cas9 knockout, enzymatic assays, zebrafish modeling, and fingolimod pharmacological rescue across concurrent independent studies","pmids":["30620337","30620338","31227640"],"confidence":"High","gaps":["How dihydroceramide accumulation impairs myelination at the cellular level remains undefined","Identity and toxicity of the atypical sphingosine isomer not fully resolved"]},{"year":2019,"claim":"A conditional Müller-cell knockout tested the physiological relevance of the proposed isomerase role and found it dispensable for the cone visual cycle.","evidence":"Pdgfrα-Cre × floxed Des1 on Gnat1−/− background, electroretinography, histology, and enzyme activity assay","pmids":["30645148"],"confidence":"High","gaps":["Does not rule out isomerase activity in other retinal cells","Reconciliation with the 2012 in vitro isomerase findings not provided"]},{"year":2022,"claim":"Epistasis experiments positioned DEGS1 as a downstream effector linking HER2-driven glucose metabolism to anchorage-independent tumor cell survival.","evidence":"RNAi knockdown, overexpression, anchorage-independent growth assays, and HER2 pathway epistasis","pmids":["36165222"],"confidence":"Medium","gaps":["Molecular link between glucose metabolism and DEGS1 activity not defined","Single lab; in vivo tumor relevance not established"]},{"year":2023,"claim":"Refining DEGS1 localization to MAMs explained how its deficiency disrupts mitochondrial dynamics, sterol/phospholipid metabolism, and lipid droplet biogenesis beyond simple ceramide depletion.","evidence":"Patient fibroblast multiomics, SOAT enzymatic assay, mitochondrial morphology imaging, superoxide detection, and muscle respirometry","pmids":["36951944"],"confidence":"High","gaps":["Causal chain from dihydroceramide imbalance to each MAM defect not dissected","Whether DEGS1 is structurally required for MAM integrity versus metabolically required is unresolved"]},{"year":2023,"claim":"Structural modeling and biomarker analysis proposed a substrate-binding site and a regulatory link to FADS3, and identified a specific lipid signature of DEGS1 loss of function.","evidence":"Patient plasma lipidomics, computational structural modeling, and bioinformatic FADS3 analysis","pmids":["37890668"],"confidence":"Low","gaps":["No direct enzymatic or binding assay confirming the predicted substrate site","FADS3 interaction inferred bioinformatically, not experimentally validated"]},{"year":null,"claim":"How dihydroceramide/ceramide imbalance is mechanistically transduced into hypomyelination, MAM dysfunction, and tumor survival, and whether DEGS1 has any validated non-desaturase activity, remain open.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No experimentally validated substrate-binding structure","Cell-type-specific mechanism of demyelination undefined","Physiological role of the mitochondrial/MAM enzyme pool not isolated from the ER pool"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[2,3,4,5]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,7,8]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[7,8]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,3,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4]}],"complexes":[],"partners":["FADS3","CRALBP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O15121","full_name":"Sphingolipid delta(4)-desaturase DES1","aliases":["Cell migration-inducing gene 15 protein","Degenerative spermatocyte homolog 1","Dihydroceramide desaturase-1","Membrane lipid desaturase","Retinol isomerase"],"length_aa":323,"mass_kda":37.9,"function":"Has sphingolipid-delta-4-desaturase activity. Converts D-erythro-sphinganine to D-erythro-sphingosine (E-sphing-4-enine) (PubMed:11937514, PubMed:30620337, PubMed:30620338). Catalyzes the equilibrium isomerization of retinols (By similarity)","subcellular_location":"Mitochondrion membrane; Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/O15121/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DEGS1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000143753","cell_line_id":"CID000299","localizations":[{"compartment":"er","grade":3},{"compartment":"vesicles","grade":3}],"interactors":[{"gene":"SURF6","stoichiometry":0.2},{"gene":"EPS15L1","stoichiometry":0.2},{"gene":"CYP51A1","stoichiometry":0.2},{"gene":"POTEE","stoichiometry":0.2},{"gene":"VAPA","stoichiometry":0.2},{"gene":"VAPB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000299","total_profiled":1310},"omim":[{"mim_id":"618404","title":"LEUKODYSTROPHY, HYPOMYELINATING, 18; HLD18","url":"https://www.omim.org/entry/618404"},{"mim_id":"615843","title":"DELTA(4)-DESATURASE, SPHINGOLIPID, 1; DEGS1","url":"https://www.omim.org/entry/615843"},{"mim_id":"610862","title":"DELTA(4)-DESATURASE, SPHINGOLIPID, 2; DEGS2","url":"https://www.omim.org/entry/610862"},{"mim_id":"312080","title":"PELIZAEUS-MERZBACHER DISEASE; PMD","url":"https://www.omim.org/entry/312080"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Cytokinetic bridge","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skin 1","ntpm":505.2}],"url":"https://www.proteinatlas.org/search/DEGS1"},"hgnc":{"alias_symbol":["MLD","Des-1","DES1","FADS7","DEGS-1"],"prev_symbol":[]},"alphafold":{"accession":"O15121","domains":[{"cath_id":"-","chopping":"12-314","consensus_level":"high","plddt":97.7226,"start":12,"end":314}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O15121","model_url":"https://alphafold.ebi.ac.uk/files/AF-O15121-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O15121-F1-predicted_aligned_error_v6.png","plddt_mean":96.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DEGS1","jax_strain_url":"https://www.jax.org/strain/search?query=DEGS1"},"sequence":{"accession":"O15121","fasta_url":"https://rest.uniprot.org/uniprotkb/O15121.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O15121/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O15121"}},"corpus_meta":[{"pmid":"12203137","id":"PMC_12203137","title":"Allogeneic mesenchymal stem cell infusion for treatment of metachromatic leukodystrophy (MLD) and Hurler syndrome (MPS-IH).","date":"2002","source":"Bone marrow transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/12203137","citation_count":489,"is_preprint":false},{"pmid":"2539101","id":"PMC_2539101","title":"Insulin-like growth factor (IGF)-binding proteins inhibit the biological activities of IGF-1 and IGF-2 but not des-(1-3)-IGF-1.","date":"1989","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/2539101","citation_count":185,"is_preprint":false},{"pmid":"8095710","id":"PMC_8095710","title":"The nature of the trophic action of brain-derived neurotrophic factor, des(1-3)-insulin-like growth factor-1, and basic fibroblast growth factor on mesencephalic dopaminergic neurons developing in culture.","date":"1993","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/8095710","citation_count":172,"is_preprint":false},{"pmid":"1996625","id":"PMC_1996625","title":"IGF-I and the truncated analogue des-(1-3)IGF-I enhance growth in rats after gut resection.","date":"1991","source":"The American journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/1996625","citation_count":148,"is_preprint":false},{"pmid":"23143414","id":"PMC_23143414","title":"Identification of DES1 as a vitamin A isomerase in Müller glial cells of the retina.","date":"2012","source":"Nature chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/23143414","citation_count":91,"is_preprint":false},{"pmid":"2005410","id":"PMC_2005410","title":"Plasma clearance and tissue distribution of labelled insulin-like growth factor-I (IGF-I), IGF-II and des(1-3)IGF-I in rats.","date":"1991","source":"The Journal of endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/2005410","citation_count":86,"is_preprint":false},{"pmid":"30620337","id":"PMC_30620337","title":"Loss of the sphingolipid desaturase DEGS1 causes hypomyelinating leukodystrophy.","date":"2019","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/30620337","citation_count":81,"is_preprint":false},{"pmid":"30620338","id":"PMC_30620338","title":"DEGS1-associated aberrant sphingolipid metabolism impairs nervous system function in humans.","date":"2019","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/30620338","citation_count":80,"is_preprint":false},{"pmid":"8106515","id":"PMC_8106515","title":"Role of the NH2-terminal domain of angiotensin II (ANG II) and [Sar1]angiotensin II on conformation and activity. 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The protein is extractable from particulate fractions only with detergent (not salt or urea), is widely expressed in human tissues, and localizes to the endoplasmic reticulum. Overexpression of MLD inhibited EGF receptor biosynthesis without affecting PDGF receptor expression.\",\n      \"method\": \"Molecular cloning, cell fractionation (detergent/salt/urea extraction), immunolocalization to ER, co-transfection overexpression assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct fractionation and localization experiments, overexpression functional assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"9188692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DES1 (DEGS1) was identified as a retinol isomerase (isomerase-2) in retinal Müller glial cells. DES1 co-immunoprecipitates with CRALBP in Müller cells. Purified DES1 showed high isomerase-2 activity in vitro in the presence of appropriate cofactors. RNAi knockdown of DES1 reduced isomerase-2 activity in cultured Müller cells. Adenoviral DES1 gene therapy partially rescued biochemical and physiological phenotypes in Rpe65−/− mice.\",\n      \"method\": \"Co-immunoprecipitation, in vitro isomerase activity assay with purified protein, RNAi knockdown, adenoviral gene therapy rescue in Rpe65−/− mice\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — purified protein in vitro activity, co-IP, RNAi knockdown, and in vivo rescue, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"23143414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DEGS1 is the desaturase catalyzing the last step in the de novo ceramide biosynthetic pathway (converting dihydroceramide to ceramide). Pharmacological or genetic ablation of DEGS1 in preadipocytes elevated dihydroceramide content, prevented adipogenesis, decreased lipid accumulation, and increased oxidative stress and cell death, establishing DEGS1 as a regulator of adipocyte differentiation through ceramide/dihydroceramide balance.\",\n      \"method\": \"Pharmacological inhibition and genetic knockdown (loss-of-function), lipid mass spectrometry, cell differentiation and viability assays, in vivo pharmacological inhibition\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — both pharmacological and genetic loss-of-function with specific lipid and cellular phenotype readouts, replicated in vivo\",\n      \"pmids\": [\"25352638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Biallelic loss-of-function mutations in DEGS1, encoding C4-dihydroceramide desaturase, cause hypomyelinating leukodystrophy. Patient fibroblasts and muscle showed marked accumulation of the substrate dihydroceramide (DhCer) and increased DhCer/Cer ratios. Disease modeling in zebrafish confirmed the phenotype. Fingolimod (which inhibits ceramide synthase, one step prior to DEGS1) reduced DhCer/Cer imbalance and locomotor disability and increased myelinating oligodendrocytes in zebrafish, establishing the enzymatic pathway position of DEGS1.\",\n      \"method\": \"Whole-exome sequencing, lipidomics in patient fibroblasts and muscle, zebrafish knockdown model, pharmacological rescue with fingolimod\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — lipidomics in patient material, zebrafish loss-of-function model, pharmacological epistasis rescue, replicated by independent concurrent study (PMID:30620338)\",\n      \"pmids\": [\"30620337\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous p.Ala280Val variant in DEGS1 causes a multisystem neurological disorder with elevated dihydro-sphingolipid species. DEGS1 enzymatic activity in patient fibroblasts was reduced by ~80%. CRISPR/Cas9 DEGS1-knockout cells and pharmacological DEGS1 inhibition recapitulated the dihydro-sphingolipid accumulation. An atypical sphingosine isomer was detected in patient plasma and cells expressing mutant DEGS1, suggesting a potentially neurotoxic metabolite.\",\n      \"method\": \"Whole-exome sequencing, lipidomics in patient fibroblasts and plasma, enzymatic activity assay, CRISPR/Cas9 knockout, pharmacological inhibition\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — enzymatic activity assay, CRISPR KO, pharmacological inhibition, and lipidomics all converge in a single rigorous study\",\n      \"pmids\": [\"30620338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A rare DEGS1 missense variant L175Q (Hispanic ancestry-specific) is associated with large increases in plasma dihydroceramides and dramatically reduced indexes of DEGS1 enzymatic activity in heterozygous carriers. CRISPR/Cas9 editing of the L175Q variant into HepG2 cells confirmed partial loss of DEGS1 function.\",\n      \"method\": \"Population genomics, plasma lipidomics, enzymatic activity assay, CRISPR/Cas9 genome editing in HepG2 cells\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — enzymatic activity assay plus CRISPR functional validation, independent of clinical studies, multiple orthogonal methods in one study\",\n      \"pmids\": [\"31227640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Conditional knockout of DEGS1 (Des1) specifically in retinal Müller cells did not impair cone visual pigment regeneration or dark adaptation in mice, but slightly accelerated the rate of cone phototransduction termination. This result indicates that Müller cell DEGS1 expression is not required for cone visual cycle function.\",\n      \"method\": \"Conditional knockout (Pdgfrα-Cre × floxed Des1 on Gnat1−/− background), electroretinography, retinal histology, enzymatic activity assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with isolated cone physiological recordings and enzyme activity confirmation, single lab but rigorous design\",\n      \"pmids\": [\"30645148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Myristic acid specifically increases native DEGS1 (DES1) enzymatic activity in cultured rat hepatocytes through N-myristoylation. The wild-type myristoylable form of recombinant DES1 localizes to both the ER and mitochondria, whereas a non-myristoylable mutant (N-terminal Gly→Ala) is almost exclusively in the ER. Myristic acid-increased DEGS1 activity was not due to increased mRNA or protein levels and slightly enhanced apoptosis.\",\n      \"method\": \"N-terminal myristoylation mutagenesis (Gly→Ala), subcellular fractionation, enzymatic activity assay in hepatocytes, confocal localization\",\n      \"journal\": \"Lipids\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct mutagenesis of myristoylation site with subcellular fractionation and enzymatic activity readout, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"22139871\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DEGS1 is a mitochondria-associated endoplasmic reticulum membrane (MAM)-resident enzyme, refining prior ER-only localization. DEGS1 deficiency (patient fibroblasts) disrupts MAM core functions: (a) mitochondrial dynamics — hyperfused mitochondrial network with decreased DRP1 activation; (b) cholesterol metabolism — impaired SOAT activity and decreased cholesteryl esters; (c) phospholipid metabolism — increased phosphatidic acid and phosphatidylserine, decreased phosphatidylethanolamine; (d) lipid droplet biogenesis — increased size and number. Increased mitochondrial superoxide and impaired mitochondrial respiration were also detected in patient muscle.\",\n      \"method\": \"Patient fibroblast studies, multiomics (proteomics, lipidomics, metabolomics), enzymatic assays (SOAT activity), mitochondrial morphology imaging, superoxide detection, muscle biopsy respirometry\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiomics plus enzymatic assays plus functional readouts in patient-derived cells and tissue, multiple orthogonal methods converging on MAM dysfunction\",\n      \"pmids\": [\"36951944\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DES1 (DEGS1) is necessary and sufficient for anchorage-independent survival (AIS) downstream of HER2-driven glucose uptake and metabolism. DES1 knockdown abolished HER2-driven AIS; DES1 overexpression was sufficient to drive AIS and in vitro tumorigenicity. DEGS1 thus acts as a transducer linking HER2-driven glucose metabolic signals to ceramide synthesis and cancer cell survival.\",\n      \"method\": \"RNAi knockdown, overexpression, anchorage-independent growth assays, HER2 pathway epistasis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function experiments with defined cellular phenotype, single lab, pathway placement by epistasis\",\n      \"pmids\": [\"36165222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Two novel DEGS1 variants near the C-terminus were characterized; structural modeling predicted a substrate-binding site. A regulatory link between DEGS1 and fatty acid desaturase 3 (FADS3) was proposed based on detection of the atypical SPB 18:1(14Z);O2 metabolite in patients with pathogenic DEGS1 variants but not in those with benign variants, establishing SPB 18:1(14Z);O2 as a specific biomarker of DEGS1 loss of function.\",\n      \"method\": \"Patient plasma lipidomics, structural modeling of DEGS1, bioinformatic analysis of FADS3 regulatory link\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3–4 / Weak — lipidomics in patient plasma plus computational structural modeling; no direct enzymatic or binding assay confirming substrate site or FADS3 interaction\",\n      \"pmids\": [\"37890668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The Des-1 protein in Drosophila melanogaster (an ortholog with six predicted transmembrane domains) is required for central spindle assembly and cytokinesis during male meiosis. Des-1 colocalizes with mitochondria throughout meiosis, associates with the spindle apparatus during anaphase/telophase, and localizes to the contractile ring. Loss of des-1 causes male sterility from cytokinesis failure.\",\n      \"method\": \"P-element mutagenesis, affinity-purified antibody immunolocalization in spermatocytes, phenotypic analysis of meiotic end products\",\n      \"journal\": \"Molecular & general genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with defined cytokinesis phenotype, direct protein immunolocalization; Drosophila ortholog, single lab\",\n      \"pmids\": [\"9819060\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DEGS1 encodes dihydroceramide desaturase-1, an endoplasmic reticulum/MAM-resident enzyme that catalyzes the final step of de novo ceramide biosynthesis (introduction of the Δ4-trans double bond converting dihydroceramide to ceramide); its activity is enhanced by N-myristoylation which also redirects a fraction of the enzyme to mitochondria, and DEGS1 deficiency disrupts MAM integrity (mitochondrial dynamics, cholesterol/phospholipid metabolism, lipid droplet biogenesis), causes hypomyelinating leukodystrophy through dihydroceramide/ceramide imbalance, and acts as a downstream effector of HER2-driven glucose metabolism to support anchorage-independent tumor cell survival.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DEGS1 encodes a membrane fatty acid desaturase that catalyzes the final step of de novo ceramide biosynthesis, introducing the Δ4 double bond that converts dihydroceramide to ceramide [#2, #3]. Cloned as a member of the membrane fatty acid desaturase family bearing three conserved histidine-rich motifs, it is an integral membrane protein extractable only with detergent and was initially localized to the endoplasmic reticulum [#0]; subsequent work refined this to a mitochondria-associated ER membrane (MAM) residence, where DEGS1 activity supports MAM core functions including mitochondrial dynamics, cholesterol esterification, phospholipid balance, and lipid droplet biogenesis [#8]. Enzyme activity is enhanced by N-myristoylation, which also redirects a fraction of the protein from ER to mitochondria [#7]. Loss of DEGS1 function — pharmacological, genetic, or via disease-associated variants — elevates dihydroceramide and raises the dihydroceramide/ceramide ratio, blocking adipocyte differentiation and increasing oxidative stress and cell death [#2], and DEGS1 also acts as a downstream effector linking HER2-driven glucose metabolism to anchorage-independent tumor cell survival [#9]. Biallelic loss-of-function mutations in DEGS1 cause hypomyelinating leukodystrophy and related multisystem neurological disease driven by dihydroceramide/ceramide imbalance, with the upstream ceramide synthase inhibitor fingolimod correcting the imbalance and myelination defect [#3, #4]. A reported retinol isomerase activity in retinal Müller glia [#1] was not supported physiologically, as Müller-cell-specific DEGS1 deletion left the cone visual cycle intact [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing the molecular identity of DEGS1 answered whether this gene encoded a bona fide membrane desaturase and where it acted in the cell.\",\n      \"evidence\": \"Molecular cloning, detergent/salt/urea fractionation, ER immunolocalization, and overexpression in cells\",\n      \"pmids\": [\"9188692\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the enzymatic substrate or reaction\", \"EGF receptor biosynthesis effect mechanism unexplained\", \"No structural model of the catalytic site\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying N-myristoylation as a regulator addressed how DEGS1 activity and subcellular distribution are controlled post-translationally.\",\n      \"evidence\": \"N-terminal Gly→Ala myristoylation mutant, subcellular fractionation, confocal imaging, and enzyme activity in rat hepatocytes\",\n      \"pmids\": [\"22139871\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of the mitochondrial enzyme pool not resolved\", \"Did not establish whether myristoylation is dynamically regulated in vivo\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"A proposed retinol isomerase role tested whether DEGS1 has a function beyond sphingolipid metabolism in the visual cycle.\",\n      \"evidence\": \"Co-IP with CRALBP, in vitro isomerase assay with purified protein, RNAi, and adenoviral rescue in Rpe65−/− mice\",\n      \"pmids\": [\"23143414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological requirement in vivo not demonstrated\", \"Relationship to the canonical desaturase activity unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining DEGS1 as the terminal dihydroceramide desaturase placed the enzyme firmly in de novo ceramide biosynthesis and linked it to cellular differentiation.\",\n      \"evidence\": \"Pharmacological and genetic loss-of-function in preadipocytes, lipid mass spectrometry, differentiation and viability assays, in vivo inhibition\",\n      \"pmids\": [\"25352638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting dihydroceramide accumulation to oxidative stress not detailed\", \"Tissue-specificity of the adipogenic effect not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Patient genetics and functional validation established DEGS1 loss of function as a Mendelian cause of hypomyelinating leukodystrophy and multisystem neurological disease, defining the pathogenic mechanism as dihydroceramide/ceramide imbalance.\",\n      \"evidence\": \"Whole-exome sequencing, patient lipidomics, CRISPR/Cas9 knockout, enzymatic assays, zebrafish modeling, and fingolimod pharmacological rescue across concurrent independent studies\",\n      \"pmids\": [\"30620337\", \"30620338\", \"31227640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How dihydroceramide accumulation impairs myelination at the cellular level remains undefined\", \"Identity and toxicity of the atypical sphingosine isomer not fully resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A conditional Müller-cell knockout tested the physiological relevance of the proposed isomerase role and found it dispensable for the cone visual cycle.\",\n      \"evidence\": \"Pdgfrα-Cre × floxed Des1 on Gnat1−/− background, electroretinography, histology, and enzyme activity assay\",\n      \"pmids\": [\"30645148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not rule out isomerase activity in other retinal cells\", \"Reconciliation with the 2012 in vitro isomerase findings not provided\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Epistasis experiments positioned DEGS1 as a downstream effector linking HER2-driven glucose metabolism to anchorage-independent tumor cell survival.\",\n      \"evidence\": \"RNAi knockdown, overexpression, anchorage-independent growth assays, and HER2 pathway epistasis\",\n      \"pmids\": [\"36165222\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between glucose metabolism and DEGS1 activity not defined\", \"Single lab; in vivo tumor relevance not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Refining DEGS1 localization to MAMs explained how its deficiency disrupts mitochondrial dynamics, sterol/phospholipid metabolism, and lipid droplet biogenesis beyond simple ceramide depletion.\",\n      \"evidence\": \"Patient fibroblast multiomics, SOAT enzymatic assay, mitochondrial morphology imaging, superoxide detection, and muscle respirometry\",\n      \"pmids\": [\"36951944\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Causal chain from dihydroceramide imbalance to each MAM defect not dissected\", \"Whether DEGS1 is structurally required for MAM integrity versus metabolically required is unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Structural modeling and biomarker analysis proposed a substrate-binding site and a regulatory link to FADS3, and identified a specific lipid signature of DEGS1 loss of function.\",\n      \"evidence\": \"Patient plasma lipidomics, computational structural modeling, and bioinformatic FADS3 analysis\",\n      \"pmids\": [\"37890668\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct enzymatic or binding assay confirming the predicted substrate site\", \"FADS3 interaction inferred bioinformatically, not experimentally validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How dihydroceramide/ceramide imbalance is mechanistically transduced into hypomyelination, MAM dysfunction, and tumor survival, and whether DEGS1 has any validated non-desaturase activity, remain open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimentally validated substrate-binding structure\", \"Cell-type-specific mechanism of demyelination undefined\", \"Physiological role of the mitochondrial/MAM enzyme pool not isolated from the ER pool\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [2, 3, 4, 5]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 7, 8]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 3, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FADS3\", \"CRALBP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}