GO:0006667 sphinganine metabolic process: Lipid Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006667 (sphinganine metabolic process) describes all chemical reactions and pathways involving sphinganine (D-erythro-2-amino-1,3-octadecanediol), the saturated backbone of sphingolipids [1, 3].
• Sphinganine is a central intermediate in de novo sphingolipid biosynthesis and is rapidly converted to dihydroceramide, ceramide, and complex sphingolipids [3, 8].
• Serine availability directly controls sphinganine production, linking amino acid metabolism to lipid signaling and immune cell function [1, 3].
• Sphinganine accumulation is associated with macular disease, peripheral neuropathy, sepsis, melanoma, and Wolfram syndrome [3, 4, 7].
• Sphinganine acts as a signaling molecule that recruits TLR4 adaptors in macrophages and regulates c-Fos in regulatory T cells [1, 4].
• CRISPR knockout, point mutation, knock-in, and overexpression models are essential for dissecting causal roles of sphinganine metabolic genes in disease [1, 3, 4].
Description
Sphinganine metabolic process (GO:0006667) encompasses the chemical reactions and pathways involving sphinganine, also known as dihydrosphingosine, which is the saturated 18-carbon amino alcohol backbone of sphingolipids [1, 3]. This process is fundamental to membrane biology and lipid signaling because sphinganine serves as the entry point for de novo sphingolipid synthesis, a pathway that produces ceramides, sphingomyelins, and glycosphingolipids [3, 8]. The QuickGO definition specifies that this process includes all transformations of D-erythro-2-amino-1,3-octadecanediol, making it a critical node for understanding how cells convert serine and palmitoyl-CoA into bioactive lipids [1, 3]. Researchers study GO:0006667 because perturbations in sphinganine metabolism have been linked to a wide range of human pathologies, including macular disease, peripheral neuropathy, sepsis, melanoma, insulin resistance, and Wolfram syndrome [3, 4, 5, 7]. For example, serine enrichment in tumors promotes regulatory T cell accumulation through sphinganine-mediated regulation of c-Fos, directly connecting this metabolic process to immune evasion. In macrophages, sphinganine recruits TLR4 adaptors and promotes inflammation in murine models of sepsis and melanoma, highlighting its role in innate immunity. The pathway is also emerging as a target for therapeutic intervention because sphinganine levels can be modulated by dietary serine, enzyme inhibitors, and genetic manipulation of biosynthetic enzymes [1, 3, 8]. Understanding the precise enzymatic steps, regulatory mechanisms, and disease associations of sphinganine metabolism is therefore essential for both basic cell biology and translational research [3, 4, 8].
sphinganine metabolic process At A Glance
| GO ID | GO:0006667 |
|---|---|
| GO term | sphinganine metabolic process |
| Ontology | biological_process |
| Synonym | dihydrosphingosine metabolic process; dihydrosphingosine metabolism; sphinganine metabolism |
| Definition | The chemical reactions and pathways involving sphinganine, D-erythro-2-amino-1,3-octadecanediol. |
| Major function | Production and turnover of the sphingoid base backbone for all sphingolipids, linking serine metabolism to lipid signaling and membrane biogenesis. |
| Key enzymes | Serine palmitoyltransferase (SPTLC1/2/3), 3-ketodihydrosphingosine reductase (KDSR), dihydroceramide desaturase (DEGS1), sphinganine kinases (SPHK1/2), ceramide synthases (CERS1-6). |
| Subcellular location | Endoplasmic reticulum (initial steps), cytosol, and mitochondria-associated membranes. |
| Related pathways | Serine metabolism, sphingolipid biosynthesis, ceramide signaling, TLR4 signaling, insulin signaling. |
What Is GO:0006667?
GO:0006667 (sphinganine metabolic process) is defined by QuickGO as the chemical reactions and pathways involving sphinganine, D-erythro-2-amino-1,3-octadecanediol. In practical terms, this includes the biosynthesis of sphinganine from serine and palmitoyl-CoA, its phosphorylation to sphinganine-1-phosphate, its acylation to dihydroceramide, and its further conversion into ceramide and complex sphingolipids [1, 3, 8]. The term also covers catabolic and interconversion reactions that maintain sphinganine homeostasis within cells [3, 8].
Why Is sphinganine metabolic process Important in Cell Biology?
Sphinganine metabolic process is important because it sits at the intersection of amino acid metabolism, lipid biosynthesis, and cellular signaling [1, 3]. Sphinganine is not merely a biosynthetic intermediate; it is a bioactive lipid that can regulate immune cell function, inflammation, and stress responses [1, 4]. Dysregulation of this process contributes to diseases ranging from macular degeneration and peripheral neuropathy to sepsis and cancer [3, 4, 7]. Moreover, because serine availability controls sphinganine production, this pathway provides a mechanistic link between dietary or metabolic inputs and disease outcomes [1, 3].
• Provides the essential sphingoid base backbone for all sphingolipids, including ceramides and sphingomyelins [3, 8].
• Links serine metabolism to immune regulation, as serine enrichment in tumors drives sphinganine-mediated c-Fos regulation in regulatory T cells.
• Acts as a pro-inflammatory signal in macrophages by recruiting TLR4 adaptors in sepsis and melanoma models.
• Its accumulation is a biomarker for Wolfram syndrome, a rare neurodegenerative disorder.
• Dysregulation is implicated in macular disease and peripheral neuropathy, where serine and lipid metabolism intersect.
• Modulates insulin resistance in hepatocytes, connecting sphingolipid signaling to metabolic syndrome.
• Is responsive to inflammatory stress and zinc status in epithelial cells, indicating broader nutritional regulation.
• Represents a potential therapeutic target for modulating inflammation, cancer immunity, and metabolic disorders [1, 4].
What Happens During sphinganine metabolic process?
De novo synthesis of sphinganine from serine and palmitoyl-CoA
In simple terms: The cell builds sphinganine from two simple building blocks: serine and palmitoyl-CoA.
The first and rate-limiting step of sphinganine metabolism is the condensation of L-serine with palmitoyl-CoA to form 3-ketodihydrosphingosine, catalyzed by serine palmitoyltransferase (SPT) [1, 3]. This reaction occurs at the cytosolic face of the endoplasmic reticulum and is highly sensitive to serine availability. Subsequently, 3-ketodihydrosphingosine is reduced by 3-ketodihydrosphingosine reductase (KDSR) to yield sphinganine [3, 8]. This two-step process constitutes the entry point for all sphingolipid biosynthesis and is tightly regulated by nutrient status and stress signals [3, 8].
Phosphorylation of sphinganine to sphinganine-1-phosphate
In simple terms: Sphinganine can be quickly converted into a signaling molecule called sphinganine-1-phosphate.
Sphinganine is phosphorylated by sphingosine kinases (SPHK1 and SPHK2) to form sphinganine-1-phosphate (dihydrosphingosine-1-phosphate), a bioactive lipid that can act both intracellularly and extracellularly [3, 8]. This phosphorylation is a reversible regulatory step that controls the balance between pro-apoptotic sphinganine and pro-survival sphinganine-1-phosphate. The reaction also serves as a salvage pathway for reutilizing sphingoid bases.
Acylation of sphinganine to dihydroceramide
In simple terms: Sphinganine gets a fatty acid tail attached to become dihydroceramide.
Sphinganine is N-acylated by ceramide synthases (CERS1-6) to form dihydroceramide, which is then desaturated by dihydroceramide desaturase (DEGS1) to produce ceramide [3, 8]. This step commits sphinganine to the synthesis of complex sphingolipids, including sphingomyelin and glycosphingolipids. The acyl chain length incorporated by specific CERS isoforms determines the downstream lipid species and their biological functions.
Catabolism and interconversion of sphinganine
In simple terms: Sphinganine can be broken down or recycled back into other sphingolipids.
Sphinganine-1-phosphate can be irreversibly degraded by sphingosine-1-phosphate lyase (SGPL1) into ethanolamine phosphate and hexadecenal, removing it from the sphingolipid pool [3, 8]. Alternatively, sphinganine can be reutilized through the salvage pathway after dephosphorylation by lipid phosphate phosphatases. These catabolic and salvage reactions maintain cellular sphinganine homeostasis and prevent lipotoxicity [3, 8].
Regulation by serine availability and metabolic stress
In simple terms: The amount of serine available to the cell directly controls how much sphinganine is made.
Serine enrichment in tumors promotes sphinganine production, which in turn regulates c-Fos and regulatory T cell accumulation. Conversely, serine deprivation reduces sphinganine synthesis and can trigger endoplasmic reticulum stress and apoptosis [3, 8]. This nutrient-sensing mechanism links amino acid metabolism to lipid signaling and immune cell function [1, 3].
Sphinganine as a signaling molecule in inflammation
In simple terms: Sphinganine itself can act like a signal that activates immune cells.
In macrophages, sphinganine recruits TLR4 adaptors and promotes inflammation in murine models of sepsis and melanoma. This signaling function is independent of its role as a biosynthetic intermediate and highlights the dual nature of sphinganine as both a metabolite and a messenger. The inflammatory effects of sphinganine are mediated through its interaction with specific protein targets and membrane domains.
Key Genes Involved in GO:0006667 sphinganine metabolic process
The following genes encode enzymes and regulatory proteins that directly participate in or control sphinganine metabolic process (GO:0006667), as supported by published literature [1, 3, 4, 8].
| Gene | Major Role | Research Relevance |
|---|---|---|
| SPTLC1 | Subunit of serine palmitoyltransferase, catalyzes the first step of sphinganine synthesis | Target for knockout and point mutation studies to dissect de novo sphingolipid synthesis [1, 3] |
| SPTLC2 | Catalytic subunit of serine palmitoyltransferase | Essential for sphinganine production; knockout is lethal in many models [3, 8] |
| SPTLC3 | Regulatory subunit that alters substrate specificity and activity | Modulates sphinganine levels in response to metabolic stress |
| KDSR | 3-ketodihydrosphingosine reductase, reduces the initial intermediate to sphinganine | Mutations cause severe skin and platelet disorders; knockout models available [3, 8] |
| CERS1 | Ceramide synthase, acylates sphinganine to dihydroceramide | Determines acyl chain length of sphingolipids; relevant to neurodegeneration |
| CERS2 | Ceramide synthase with preference for very long-chain fatty acids | Knockout models show altered sphinganine incorporation |
| CERS4 | Ceramide synthase involved in skin barrier function | Target for studying sphinganine flux in epithelial cells |
| CERS5 | Ceramide synthase linked to insulin resistance | Relevant to hepatocyte sphingolipid signaling |
| CERS6 | Ceramide synthase associated with obesity and inflammation | Potential target for metabolic disease models |
| DEGS1 | Dihydroceramide desaturase, converts dihydroceramide to ceramide | Regulates the balance between sphinganine-derived lipids [3, 8] |
| SPHK1 | Sphingosine kinase 1, phosphorylates sphinganine to sphinganine-1-phosphate | Key regulator of pro-survival signaling; knockout and inhibitor studies |
| SPHK2 | Sphingosine kinase 2, phosphorylates sphinganine and other sphingoid bases | Nuclear functions and epigenetic regulation |
| SGPL1 | Sphingosine-1-phosphate lyase, degrades sphinganine-1-phosphate | Loss causes sphingolipidosis; knockout models available |
| TLR4 | Toll-like receptor 4, recruits adaptors in response to sphinganine | Mediates inflammatory signaling in macrophages |
| FOS | c-Fos, transcription factor regulated by sphinganine in T cells | Links sphinganine metabolism to immune cell activation |
| SPNS2 | Sphinganine-1-phosphate transporter | Controls extracellular sphinganine-1-phosphate levels |
| ABCA1 | Lipid transporter affecting sphinganine distribution | Relevant to macrophage lipid metabolism |
| SMPD1 | Acid sphingomyelinase, generates ceramide from sphingomyelin | Indirectly affects sphinganine salvage |
How Is sphinganine metabolic process Regulated?
Sphinganine metabolic process is regulated at multiple levels. The rate-limiting enzyme serine palmitoyltransferase (SPT) is feedback-inhibited by sphinganine and downstream sphingolipids, and its expression is controlled by the unfolded protein response and nutrient sensors [3, 8]. Serine availability directly dictates flux through the pathway, as shown by serine enrichment promoting sphinganine production in tumors. Inflammatory stimuli such as lipopolysaccharide can increase sphinganine levels in macrophages, which then recruit TLR4 adaptors. Additionally, insulin signaling and metabolic stress modulate sphinganine metabolism in hepatocytes, linking this pathway to systemic glucose homeostasis. Zinc status and inflammatory stress also remodel sphingolipid metabolism in epithelial cells.
sphinganine metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SPTLC1 | Macular disease, peripheral neuropathy | Knockout and point mutation in retinal organoids or mouse models |
| SPTLC2 | Hereditary sensory neuropathy | Conditional knockout in neurons |
| TLR4 | Sepsis, melanoma inflammation | Macrophage-specific knockout and sphinganine treatment |
| FOS | Cancer immunity, T cell regulation | Regulatory T cell-specific knockout and overexpression |
| SGPL1 | Sphingolipidosis, adrenal insufficiency | Knockout zebrafish and mouse models |
Sphinganine metabolism in macular disease and peripheral neuropathy
Dysregulation of serine and lipid metabolism, including sphinganine metabolic process, has been implicated in macular disease and peripheral neuropathy. Gantner et al. (2019) demonstrated that mutations affecting serine metabolism lead to abnormal sphinganine levels and retinal degeneration, providing a mechanistic link between this pathway and neurodegenerative disease. This has spurred interest in targeting sphinganine metabolism for therapeutic intervention in ophthalmology and neurology.
Sphinganine as a driver of inflammation in sepsis and melanoma
Sphinganine recruits TLR4 adaptors in macrophages and promotes inflammation in murine models of sepsis and melanoma. Hering et al. (2024) showed that sphinganine accumulation exacerbates inflammatory responses, suggesting that inhibitors of sphinganine synthesis or signaling could be beneficial in sepsis. This positions sphinganine metabolic process as a therapeutic node in acute and chronic inflammatory diseases.
Sphinganine metabolism in cancer immunity
Serine enrichment in tumors promotes regulatory T cell accumulation through sphinganine-mediated regulation of c-Fos. Ma et al. (2024) identified sphinganine as a key metabolite linking serine availability to immune suppression, highlighting the potential of targeting this pathway to enhance anti-tumor immunity. This has direct implications for cancer immunotherapy.
Sphinganine as a biomarker in Wolfram syndrome
Serum metabolic fingerprinting identified a putatively annotated sphinganine isomer as a biomarker of Wolfram syndrome, a rare autosomal recessive neurodegenerative disorder. Zmyslowska et al. (2017) reported that sphinganine levels are altered in Wolfram syndrome patients, suggesting that this metabolite could aid in diagnosis or monitoring. This underscores the clinical relevance of sphinganine metabolic process.
From sphinganine metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SPTLC1 reduce sphinganine levels and affect cell viability? | CRISPR knockout in HEK293 or HeLa cells |
| Does a specific point mutation in KDSR alter substrate specificity? | Point mutation knock-in in patient-derived fibroblasts |
| Can tagged SPTLC2 be used to monitor enzyme localization? | Knock-in of fluorescent tag at endogenous locus |
| Does overexpression of SPHK1 increase sphinganine-1-phosphate and promote survival? | Doxycycline-inducible overexpression in cancer cell lines |
| Does macrophage-specific deletion of TLR4 abolish sphinganine-induced inflammation? | Conditional knockout in murine macrophages |
| Does serine deprivation alter sphinganine flux in T cells? | CRISPR knockout of serine transporters combined with metabolomics |
How to Study the sphinganine metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS lipidomics | Sphinganine and related sphingolipid species | Quantifying pathway flux in cells and tissues [1, 3] |
| CRISPR knockout screening | Genes affecting sphinganine levels or toxicity | Discovery of novel regulators [1, 3] |
| RNA-seq | Transcriptional changes in sphinganine metabolic genes | Response to serine deprivation or inflammatory stimuli [3, 8] |
| Proteomics | Protein expression and interactions | Identifying sphinganine-binding proteins |
| Fluorescence microscopy | Subcellular localization of enzymes and sphinganine analogs | Tracking pathway dynamics [3, 8] |
| Enzyme activity assays | SPT, KDSR, SPHK, and CERS activities | Validating genetic perturbations [3, 8] |
| Metabolic flux analysis | Rate of sphinganine synthesis and turnover | Quantifying pathway activity [1, 3] |
| Immunoblotting | Protein levels of key enzymes | Confirming knockout or overexpression [3, 4] |
Metabolomics and lipidomics for sphinganine quantification
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is the gold standard for measuring sphinganine and its derivatives in cells and tissues [1, 3]. Targeted lipidomics can quantify sphinganine, sphinganine-1-phosphate, dihydroceramide, and ceramide species simultaneously, providing a comprehensive view of pathway flux [3, 7]. These methods are essential for validating genetic or pharmacological perturbations [1, 4].
CRISPR screening to identify regulators of sphinganine metabolism
Genome-wide CRISPR knockout screens can identify genes that modulate sphinganine levels or sensitivity to sphinganine-induced toxicity [1, 3]. Such screens have revealed roles for serine transporters and lipid metabolic enzymes in controlling sphinganine homeostasis. Coupling screens with metabolomic readouts enables discovery of novel pathway components.
Transcriptomics and proteomics to map pathway regulation
RNA sequencing and quantitative proteomics can reveal how sphinganine metabolic genes are transcriptionally and post-translationally regulated under different conditions [3, 8]. For example, serine deprivation induces endoplasmic reticulum stress genes and alters expression of SPT subunits. Proteomic profiling can also identify sphinganine-binding proteins that mediate its signaling functions.
Imaging and subcellular localization studies
Fluorescently tagged sphinganine analogs and GFP-tagged enzymes allow visualization of sphinganine trafficking and enzyme localization in live cells [3, 8]. Confocal microscopy can track the movement of sphinganine from the endoplasmic reticulum to the Golgi and plasma membrane. These approaches are valuable for understanding how mutations affect pathway organization.
How CRISPR Can Be Used to Study GO:0006667 sphinganine metabolic process
Knockout
CRISPR knockout of genes such as SPTLC1, KDSR, or SPHK1 is used to abolish sphinganine production or phosphorylation, enabling loss-of-function studies [1, 3]. Knockout cell lines are valuable for dissecting the contribution of specific enzymes to sphinganine flux and downstream phenotypes. For example, SPTLC1 knockout reduces sphinganine levels and impairs cell proliferation.
Point Mutation
Point mutations in genes like KDSR or SPTLC2 can mimic human disease alleles and reveal structure-function relationships. CRISPR-mediated point mutation knock-in allows precise editing of catalytic residues or regulatory phosphorylation sites. Such models are essential for understanding how specific mutations alter sphinganine metabolism.
Knock-in
Knock-in of fluorescent or affinity tags at endogenous loci (e.g., SPTLC2-GFP) enables real-time tracking of enzyme localization and interaction. Knock-in of disease-associated mutations can create isogenic models for drug testing. This approach preserves endogenous regulatory elements and expression levels.
Overexpression
Overexpression of SPHK1 or CERS isoforms using CRISPR activation or lentiviral vectors increases sphinganine-1-phosphate or dihydroceramide levels, respectively. Overexpression models are useful for gain-of-function studies and for testing whether increased pathway flux is sufficient to drive phenotypes [1, 8]. For example, SPHK1 overexpression promotes cell survival in stress conditions.
How EDITGENE Supports sphinganine metabolic process Research
Researchers studying sphinganine metabolic process-related genes often need to determine whether a candidate gene is causally involved in pathway regulation or disease. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of genes such as SPTLC1, KDSR, SPHK1, and TLR4 in the context of sphinganine metabolism [1, 3, 4].
Contact EDITGENE today to design your custom CRISPR model for sphinganine metabolic process research.
Frequently Asked Questions About sphinganine metabolic process
What is GO:0006667 sphinganine metabolic process?
GO:0006667 is a Gene Ontology biological process term defined as the chemical reactions and pathways involving sphinganine, D-erythro-2-amino-1,3-octadecanediol. It encompasses the synthesis, phosphorylation, acylation, and degradation of sphinganine, a key intermediate in sphingolipid metabolism [1, 3].
What genes are involved in sphinganine metabolic process?
Key genes include SPTLC1, SPTLC2, SPTLC3, KDSR, CERS1-6, DEGS1, SPHK1, SPHK2, and SGPL1, which encode enzymes that synthesize, modify, or degrade sphinganine [1, 3, 8].
Why is sphinganine important in cancer?
Sphinganine links serine metabolism to immune regulation; serine enrichment in tumors promotes regulatory T cell accumulation through sphinganine-mediated regulation of c-Fos, contributing to immune evasion.
How is sphinganine metabolism regulated?
It is regulated by serine availability, feedback inhibition of serine palmitoyltransferase, inflammatory stimuli such as LPS, and insulin signaling, among other factors [1, 3, 4, 5].
What diseases are associated with sphinganine metabolism?
Diseases include macular disease, peripheral neuropathy, sepsis, melanoma, Wolfram syndrome, and insulin resistance [3, 4, 5, 7].
What is the role of sphinganine in inflammation?
Sphinganine recruits TLR4 adaptors in macrophages and promotes inflammation in murine models of sepsis and melanoma.
How can I study sphinganine metabolic process in the lab?
Common methods include LC-MS/MS lipidomics, CRISPR knockout screens, RNA-seq, proteomics, and fluorescence microscopy [1, 3, 8].
What CRISPR models are available for sphinganine research?
EDITGENE offers knockout, point mutation knock-in, tagged knock-in, overexpression, and CRISPR library screening services for genes in this pathway [1, 3, 4].
Is sphinganine a biomarker for any disease?
A putatively annotated sphinganine isomer has been identified as a serum biomarker for Wolfram syndrome.
What is the difference between sphinganine and sphingosine?
Sphinganine is the saturated form (dihydrosphingosine), while sphingosine is the unsaturated form; both are sphingoid bases but differ in a double bond and are metabolically interconverted [3, 8].
Conclusion
Sphinganine metabolic process (GO:0006667) is a fundamental biological pathway that connects serine metabolism to sphingolipid biosynthesis and immune signaling. Its dysregulation is implicated in a growing list of human diseases, including macular disease, peripheral neuropathy, sepsis, melanoma, and Wolfram syndrome [3, 4, 7]. Understanding the enzymes, regulatory mechanisms, and disease associations of this pathway is essential for developing targeted therapies [1, 3, 8]. EDITGENE provides comprehensive CRISPR-based services to facilitate functional studies of sphinganine metabolic genes, enabling researchers to generate knockout, point mutation, knock-in, and overexpression models with precision and efficiency [1, 3, 4]. By combining advanced genome editing with bioinformatics support, EDITGENE empowers discoveries that can translate into clinical benefit.
References
- 1. Ma S et al.. 2024. Serine enrichment in tumors promotes regulatory T cell accumulation through sphinganine-mediated regulation of c-Fos.. Sci Immunol 9(94):eadg8817 PMID: 38640251
- 3. Gantner ML et al.. 2019. Serine and Lipid Metabolism in Macular Disease and Peripheral Neuropathy.. N Engl J Med 381(15):1422-1433 PMID: 31509666
- 4. Hering M et al.. 2024. Sphinganine recruits TLR4 adaptors in macrophages and promotes inflammation in murine models of sepsis and melanoma.. Nat Commun 15(1):6067 PMID: 39025856
- 5. Zywno H et al.. 2021. The Influence of Coumestrol on Sphingolipid Signaling Pathway and Insulin Resistance Development in Primary Rat Hepatocytes.. Biomolecules 11(2) PMID: 33673122
- 6. Álvarez-Barrios A et al.. 2026. Zinc modulates metallothionein remodeling and lipid metabolism in human epithelial cells under inflammatory stress.. J Nutr Biochem 156:110416 PMID: 42142546
- 7. Zmyslowska A et al.. 2017. Serum Metabolic Fingerprinting Identified Putatively Annotated Sphinganine Isomer as a Biomarker of Wolfram Syndrome.. J Proteome Res 16(11):4000-4008 PMID: 28895401
- 8. Park WJ et al.. 2020. The role of sphingolipids in endoplasmic reticulum stress.. FEBS Lett 594(22):3632-3651 PMID: 32538465
