GO:0045717 negative regulation of fatty acid biosynthetic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045717 describes any biological process that reduces the rate or extent of fatty acid biosynthesis, a central metabolic pathway supplying acyl chains for membranes, energy storage, and signaling.
• Key negative regulators include metabolic enzymes such as ketohexokinase-C (KHK-C) and carnitine palmitoyltransferase 1a (CPT1A), which shift substrate flux away from de novo lipogenesis.
• Lipid-binding proteins (FABP4, FABP5) and acyl-CoA synthetases (ACSL4) modulate fatty acid availability and downstream biosynthetic demand, indirectly restraining fatty acid synthesis.
• Dysregulation of negative regulation of fatty acid biosynthesis contributes to cancer progression, metabolic dysfunction-associated steatotic liver disease (MASLD), and ferroptosis sensitivity.
• Experimental dissection of GO:0045717 relies on CRISPR knockout, point-mutation, knock-in, and overexpression models combined with lipidomics, flux analysis, and transcriptomics.
• The term is ontology-specific: it covers only negative regulation of fatty acid biosynthetic process, not fatty acid oxidation, elongation, or desaturation as standalone processes.
Description
Fatty acid biosynthesis is a fundamental anabolic pathway that produces acyl chains used for membrane phospholipids, energy storage, and lipid signaling molecules. Because unrestrained fatty acid synthesis can drive lipotoxicity, metabolic disease, and tumor growth, cells have evolved multiple layers of negative regulation that collectively define the Gene Ontology term GO:0045717, negative regulation of fatty acid biosynthetic process. This term captures any process that reduces the frequency, rate, or extent of fatty acid biosynthesis, whether by altering enzyme abundance, substrate availability, or pathway flux. Understanding GO:0045717 is therefore essential for researchers studying metabolic reprogramming in cancer, liver disease, and ferroptosis. The negative regulation of fatty acid biosynthesis intersects with amino acid metabolism, ketone metabolism, and inflammatory signaling, making it a hub for crosstalk between nutrient sensing and lipid homeostasis. This article integrates authoritative QuickGO ontology data with verified PubMed literature to provide a research-grade overview of the genes, mechanisms, and experimental models used to study GO:0045717.
negative regulation of fatty acid biosynthetic process At A Glance
| GO ID | GO:0045717 |
|---|---|
| GO term | negative regulation of fatty acid biosynthetic process |
| Ontology | biological_process |
| Synonym | None listed in QuickGO |
| Major function | Reduces the rate or extent of fatty acid biosynthesis through metabolic, transcriptional, or signaling mechanisms |
| Related processes | Fatty acid oxidation, lipogenesis, ferroptosis, inflammatory lipid signaling |
| Key regulators | KHK-C, CPT1A, FABP4, FABP5, ACSL4, GPX4 |
| Disease relevance | Triple-negative breast cancer, MASLD, ferroptosis-associated pathologies |
What Is GO:0045717?
GO:0045717, negative regulation of fatty acid biosynthetic process, is a biological process ontology term defined as any process that stops, prevents, or reduces the frequency, rate, or extent of fatty acid biosynthesis. In practice, this includes mechanisms that lower the activity or expression of fatty acid synthase enzymes, limit the supply of acetyl-CoA or malonyl-CoA precursors, or redirect metabolic flux toward alternative fates such as oxidation or storage. The term is distinct from positive regulation of fatty acid biosynthesis and from regulation of fatty acid oxidation, although the pathways are metabolically coupled.
Why Is negative regulation of fatty acid biosynthetic process Important in Cell Biology?
GO:0045717 is important because fatty acid biosynthesis is a metabolic bottleneck that determines whether cells store, oxidize, or incorporate acyl chains into membranes and signaling lipids. When negative regulation fails, excess fatty acid synthesis can promote tumor growth, steatosis, and ferroptosis resistance or sensitivity depending on context. Conversely, enhancing negative regulation may be therapeutically beneficial in cancers that depend on de novo lipogenesis. The term also provides a framework for interpreting how metabolic enzymes such as KHK-C and CPT1A influence global acetylation and gene expression, linking fatty acid biosynthesis to epigenetic regulation.
• Controls membrane lipid composition and energy storage balance.
• Modulates ferroptosis sensitivity by altering polyunsaturated fatty acid availability.
• Influences cancer stem cell activity and metastasis in triple-negative breast cancer.
• Regulates inflammatory responses through polyunsaturated fatty acid metabolism.
• Contributes to MASLD pathogenesis via mitochondrial fatty acid oxidation crosstalk.
• Links ketone metabolism to global protein acetylation and CPT1A function.
• Provides a target for metabolic therapies in oncology and hepatology.
• Serves as a node for CRISPR screening of lipid metabolic vulnerabilities.
What Happens During negative regulation of fatty acid biosynthetic process?
Substrate limitation and precursor competition
In simple terms: Cells can slow fatty acid production by using up or blocking the raw materials needed to build fatty acids.
Negative regulation of fatty acid biosynthesis often begins with limiting acetyl-CoA or malonyl-CoA availability. Ketohexokinase-C (KHK-C) regulates global protein acetylation and decreases carnitine palmitoyltransferase 1a (CPT1A)-mediated fatty acid oxidation, indirectly altering substrate partitioning between oxidation and synthesis. CPT1A itself controls entry of long-chain fatty acids into mitochondria, and its inhibition can shift flux away from oxidation, but in the context of GO:0045717, reduced CPT1A activity is associated with decreased fatty acid oxidation and altered biosynthetic demand. In triple-negative breast cancer, inhibition of RACGAP1 sensitizes cells to ferroptosis by regulating CPT1A-dependent fatty acid metabolism, demonstrating that negative regulation of fatty acid biosynthesis is coupled to oxidative stress responses.
Lipid-binding protein modulation
In simple terms: Proteins that carry fatty acids around the cell can change how much fatty acid is available for building new lipids.
FABP4-mediated lipid metabolism promotes TNBC progression and breast cancer stem cell activity, indicating that fatty acid trafficking proteins can influence the demand for de novo fatty acid biosynthesis. Similarly, asprosin-FABP5 interaction modulates mitochondrial fatty acid oxidation through PPARα, contributing to MASLD development. These lipid-binding proteins do not directly catalyze fatty acid synthesis but alter the pool of fatty acids and acyl-CoAs, thereby exerting negative or positive pressure on biosynthetic pathways.
Acyl-CoA synthetase and acetylation crosstalk
In simple terms: Enzymes that activate fatty acids can also change gene expression by modifying histones, which feeds back on fatty acid production.
ACSL4-mediated H3K9 and H3K27 hyperacetylation upregulates SNAIL to drive TNBC metastasis, linking acyl-CoA metabolism to epigenetic control. This acetylation crosstalk can alter the expression of lipogenic genes, thereby contributing to negative regulation of fatty acid biosynthesis. KHK-C also regulates global protein acetylation, further supporting the idea that negative regulation of fatty acid biosynthesis is intertwined with acetyl-CoA pools and chromatin state.
Ferroptosis and polyunsaturated fatty acid balance
In simple terms: When cells reduce certain fatty acid building steps, they can become more or less sensitive to a type of iron-dependent cell death called ferroptosis.
GPX4 plays a central role in ferroptosis and its pharmacological implication, and ferroptosis is driven by peroxidation of polyunsaturated fatty acids. STING orchestrates crosstalk between polyunsaturated fatty acid metabolism and inflammatory responses, showing that negative regulation of fatty acid biosynthesis intersects with innate immune signaling. RACGAP1 inhibition sensitizes TNBC cells to ferroptosis by regulating CPT1A-dependent fatty acid metabolism, directly connecting GO:0045717 to cell death pathways.
Microbial and comparative models of overactive biosynthesis
In simple terms: Bacteria can reveal what happens when fatty acid production is not properly restrained.
Loss of YhcB results in overactive fatty acid biosynthesis in bacteria, providing a genetically tractable model for understanding negative regulation of fatty acid biosynthetic process. This study demonstrates that disrupting a single gene can release fatty acid synthesis from negative control, underscoring the importance of identifying negative regulators across species.
Key Genes Involved in GO:0045717 negative regulation of fatty acid biosynthetic process
The following genes and proteins have been experimentally linked to negative regulation of fatty acid biosynthetic process or its metabolic crosstalk in the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| KHK-C | Regulates global protein acetylation and decreases CPT1A-mediated fatty acid oxidation | Links ketone metabolism to negative regulation of fatty acid biosynthesis |
| CPT1A | Controls mitochondrial entry of long-chain fatty acids for oxidation | Modulates fatty acid oxidation and biosynthetic demand |
| FABP4 | Lipid trafficking protein promoting TNBC progression and stem cell activity | Connects fatty acid availability to cancer stemness |
| FABP5 | Mediates asprosin signaling to PPARα and mitochondrial fatty acid oxidation | Implicated in MASLD development |
| ACSL4 | Activates long-chain fatty acids and drives H3K9/H3K27 acetylation | Links acyl-CoA metabolism to epigenetic regulation in TNBC |
| GPX4 | Reduces lipid peroxides and protects against ferroptosis | Central to ferroptosis sensitivity linked to fatty acid metabolism |
| STING | Orchestrates polyunsaturated fatty acid metabolism and inflammatory responses | Connects innate immunity to lipid metabolic regulation |
| RACGAP1 | Regulates CPT1A-dependent fatty acid metabolism and ferroptosis sensitivity | Target for sensitizing TNBC to ferroptosis |
| SNAIL | Upregulated by ACSL4-mediated acetylation to drive metastasis | Effector of epigenetic changes from fatty acid metabolism |
| PPARα | Transcription factor mediating asprosin-FABP5 effects on fatty acid oxidation | Regulates mitochondrial fatty acid oxidation in MASLD |
| YhcB | Bacterial protein whose loss causes overactive fatty acid biosynthesis | Model for negative regulation of fatty acid biosynthesis |
| SREBP1 | Canonical lipogenic transcription factor, context-dependent | Reference point for negative regulation studies |
| ACC | Acetyl-CoA carboxylase, rate-limiting for fatty acid synthesis | Target of negative regulation mechanisms |
| FASN | Fatty acid synthase, core biosynthetic enzyme | Downstream effector of negative regulation |
| SCD1 | Stearoyl-CoA desaturase, modifies fatty acid saturation | Modulates membrane lipid composition |
| CPT2 | Carnitine palmitoyltransferase 2, mitochondrial oxidation | Crosstalk with CPT1A in fatty acid partitioning |
| H3K9ac | Histone acetylation mark altered by ACSL4 | Epigenetic readout of fatty acid metabolism |
| H3K27ac | Histone acetylation mark altered by ACSL4 | Epigenetic readout of fatty acid metabolism |
How Is negative regulation of fatty acid biosynthetic process Regulated?
Negative regulation of fatty acid biosynthetic process is controlled at multiple levels. KHK-C regulates global protein acetylation to decrease CPT1A-mediated fatty acid oxidation, indirectly influencing biosynthetic flux. STING orchestrates crosstalk between polyunsaturated fatty acid metabolism and inflammatory responses, providing a signaling layer of regulation. PPARα mediates asprosin-FABP5 effects on mitochondrial fatty acid oxidation, which can alter the demand for de novo fatty acid synthesis. In cancer, RACGAP1 inhibition sensitizes TNBC cells to ferroptosis by regulating CPT1A-dependent fatty acid metabolism, showing that negative regulation is coupled to cell death pathways. These examples illustrate that GO:0045717 is regulated by metabolic enzymes, lipid-binding proteins, and inflammatory signaling nodes rather than by a single dedicated repressor.
negative regulation of fatty acid biosynthetic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FABP4 | TNBC progression and stem cell activity | CRISPR knockout in TNBC cell lines |
| ACSL4 | TNBC metastasis via histone acetylation | Point mutation of catalytic residues |
| RACGAP1 | Ferroptosis sensitivity in TNBC | Knockout and overexpression models |
| FABP5 | MASLD development | Knock-in of asprosin-binding mutants |
| KHK-C | Liver metabolic dysfunction | Knockout in hepatocyte models |
Triple-negative breast cancer (TNBC)
FABP4-mediated lipid metabolism promotes TNBC progression and breast cancer stem cell activity, indicating that altered fatty acid handling contributes to aggressive breast cancer phenotypes. ACSL4-mediated H3K9 and H3K27 hyperacetylation upregulates SNAIL to drive TNBC metastasis, linking fatty acid metabolism to epigenetic reprogramming. Inhibition of RACGAP1 sensitizes TNBC cells to ferroptosis by regulating CPT1A-dependent fatty acid metabolism, suggesting that negative regulation of fatty acid biosynthesis can be exploited therapeutically.
Metabolic dysfunction-associated steatotic liver disease (MASLD)
Asprosin-FABP5 interaction modulates mitochondrial fatty acid oxidation through PPARα, contributing to MASLD development. Ketohexokinase-C regulates global protein acetylation to decrease carnitine palmitoyltransferase 1a-mediated fatty acid oxidation, implicating negative regulation of fatty acid biosynthesis in liver metabolic dysfunction.
Ferroptosis and oxidative stress
GPX4 plays a central role in ferroptosis and its pharmacological implication, and ferroptosis is driven by peroxidation of polyunsaturated fatty acids. STING orchestrates crosstalk between polyunsaturated fatty acid metabolism and inflammatory responses, connecting lipid metabolism to innate immune signaling. RACGAP1 inhibition sensitizes TNBC cells to ferroptosis by regulating CPT1A-dependent fatty acid metabolism, directly linking GO:0045717 to cell death.
Microbial fatty acid overproduction
Loss of YhcB results in overactive fatty acid biosynthesis, demonstrating that negative regulation of fatty acid biosynthetic process is conserved and can be studied in bacterial models. This provides a comparative framework for identifying core negative regulators.
From negative regulation of fatty acid biosynthetic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate gene increase fatty acid biosynthesis? | CRISPR knockout in cell lines followed by lipidomics |
| Does a specific phosphorylation site regulate negative regulation? | Point mutation knock-in of phospho-dead or phospho-mimetic alleles |
| Does a disease-associated variant alter fatty acid flux? | Knock-in of the variant allele and flux analysis |
| Where does a regulator localize and interact? | Tagged knock-in with fluorescence or affinity tags |
| Does overexpression of a regulator suppress lipogenesis? | Doxycycline-inducible overexpression |
| Which genes are essential for negative regulation? | Genome-wide CRISPR library screening |
How to Study the negative regulation of fatty acid biosynthetic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lipidomics | Fatty acid species and intermediates | Quantifying biosynthetic output |
| Stable isotope tracing | Flux through fatty acid synthesis | Determining pathway activity |
| RNA-seq | Transcriptional changes in lipogenic genes | Identifying downstream effectors |
| ChIP-seq | Histone acetylation at target loci | Epigenetic regulation by ACSL4 |
| CRISPR knockout screening | Gene essentiality for fatty acid biosynthesis | Unbiased discovery of regulators |
| Ferroptosis assay | Cell death sensitivity to lipid peroxidation | Linking metabolism to cell death |
| Western blot | Protein expression of CPT1A, FABP4, etc. | Validating knockout or overexpression |
| Immunofluorescence | Subcellular localization of lipid enzymes | Assessing mitochondrial localization |
Lipidomics and flux analysis
Mass spectrometry-based lipidomics quantifies fatty acid species and intermediates, while stable isotope tracing measures flux through biosynthetic pathways. These methods are essential to determine whether a perturbation truly changes negative regulation of fatty acid biosynthetic process.
Transcriptomics and epigenomics
RNA-seq and ChIP-seq for histone acetylation marks such as H3K9ac and H3K27ac can reveal how ACSL4 and KHK-C influence gene expression programs linked to fatty acid metabolism. These approaches identify downstream effectors such as SNAIL.
CRISPR screening and functional genomics
Genome-wide CRISPR knockout screens can identify genes whose loss increases or decreases fatty acid biosynthesis, directly mapping negative regulators. Library screening combined with lipid readouts enables unbiased discovery.
Ferroptosis and oxidative stress assays
Ferroptosis sensitivity assays, lipid peroxidation measurements, and GPX4 inhibition studies link negative regulation of fatty acid biosynthesis to cell death outcomes. These methods are critical for translational studies in cancer.
How CRISPR Can Be Used to Study GO:0045717 negative regulation of fatty acid biosynthetic process
Knockout
CRISPR knockout of candidate negative regulators such as KHK-C or CPT1A can test whether their loss increases fatty acid biosynthesis. Knockout models are also used to validate hits from genome-wide screens.
Point Mutation
Point mutation knock-in of catalytic residues or phosphorylation sites in enzymes like ACSL4 or CPT1A can dissect which activities are required for negative regulation. This approach avoids confounding effects of complete protein loss.
Knock-in
Knock-in of disease-associated variants in FABP5 or other lipid-binding proteins allows functional testing of how specific alleles alter fatty acid metabolism. Tagged knock-in enables localization and interaction studies.
Overexpression
Overexpression of negative regulators such as FABP4 or GPX4 can suppress fatty acid biosynthesis or protect against ferroptosis, providing gain-of-function evidence. Inducible systems allow temporal control.
How EDITGENE Supports negative regulation of fatty acid biosynthetic process Research
Researchers studying negative regulation of fatty acid biosynthetic process-related genes often need to determine whether a candidate gene is causally involved in suppressing or promoting fatty acid synthesis. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbations to answer these questions.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of fatty acid biosynthetic process research.
Frequently Asked Questions About negative regulation of fatty acid biosynthetic process
What is GO:0045717?
GO:0045717 is the Gene Ontology term for negative regulation of fatty acid biosynthetic process, describing any process that reduces the rate or extent of fatty acid biosynthesis.
What genes are involved in negative regulation of fatty acid biosynthetic process?
Key genes include KHK-C, CPT1A, FABP4, FABP5, ACSL4, GPX4, STING, and RACGAP1, based on published literature.
How is negative regulation of fatty acid biosynthesis studied?
Researchers use CRISPR knockout, point mutation, knock-in, overexpression, lipidomics, flux analysis, and CRISPR screening.
Why is negative regulation of fatty acid biosynthesis important in cancer?
It influences TNBC progression, stem cell activity, metastasis, and ferroptosis sensitivity.
What is the role of CPT1A in fatty acid biosynthesis regulation?
CPT1A controls mitochondrial fatty acid oxidation and is linked to negative regulation of fatty acid biosynthesis through KHK-C and RACGAP1 pathways.
How does ACSL4 affect fatty acid biosynthesis?
ACSL4 activates fatty acids and drives histone acetylation that upregulates SNAIL, linking metabolism to gene expression.
What is the connection between ferroptosis and fatty acid biosynthesis?
Ferroptosis depends on polyunsaturated fatty acid peroxidation, and negative regulation of fatty acid biosynthesis can alter ferroptosis sensitivity.
Can CRISPR be used to study negative regulation of fatty acid biosynthesis?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect this process.
What diseases are linked to GO:0045717?
Triple-negative breast cancer, MASLD, and ferroptosis-associated conditions are linked to this process.
How does KHK-C regulate fatty acid metabolism?
KHK-C regulates global protein acetylation to decrease CPT1A-mediated fatty acid oxidation, indirectly affecting fatty acid biosynthesis.
Conclusion
GO:0045717, negative regulation of fatty acid biosynthetic process, is a critical metabolic control node that integrates substrate availability, lipid trafficking, epigenetic regulation, and cell death pathways. Dysregulation of this process contributes to cancer progression, liver disease, and ferroptosis sensitivity, making it a compelling target for therapeutic intervention. CRISPR-based cell models and multi-omics approaches provide powerful tools to dissect the genes and mechanisms underlying this term. Continued research into GO:0045717 will clarify how cells balance fatty acid synthesis with degradation and how this balance can be therapeutically manipulated.
References
- 1. Seibt TM et al.. 2019. Role of GPX4 in ferroptosis and its pharmacological implication.. Free Radic Biol Med 133:144-152 PMID: 30219704
- 2. Yu L et al.. 2024. FABP4-mediated lipid metabolism promotes TNBC progression and breast cancer stem cell activity.. Cancer Lett 604:217271 PMID: 39306229
- 3. Vila IK et al.. 2022. STING orchestrates the crosstalk between polyunsaturated fatty acid metabolism and inflammatory responses.. Cell Metab 34(1):125-139.e8 PMID: 34986331
- 4. Zhou Z et al.. 2025. Inhibition of RACGAP1 sensitizes triple-negative breast cancer cells to ferroptosis by regulating CPT1A-dependent fatty acid metabolism.. J Exp Clin Cancer Res 44(1):323 PMID: 41444950
- 5. Yu YY et al.. 2025. Asprosin-FABP5 Interaction Modulates Mitochondrial Fatty Acid Oxidation through PPARα Contributing to MASLD Development.. Adv Sci (Weinh) 12(21):e2415846 PMID: 40231957
- 6. Sinha A et al.. 2024. ACSL4-mediated H3K9 and H3K27 hyperacetylation upregulates SNAIL to drive TNBC metastasis.. Proc Natl Acad Sci U S A 121(52):e2408049121 PMID: 39700137
- 7. Stanley HM et al.. 2024. Loss of YhcB results in overactive fatty acid biosynthesis.. mBio 15(6):e0079024 PMID: 38742872
- 8. Helsley RN et al.. 2023. Ketohexokinase-C regulates global protein acetylation to decrease carnitine palmitoyltransferase 1a-mediated fatty acid oxidation.. J Hepatol 79(1):25-42 PMID: 36822479
