GO:0006631 fatty acid metabolic process: Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0006631 fatty acid metabolic process describes all chemical reactions and pathways involving fatty acids, the aliphatic monocarboxylic acids released from fats and oils by hydrolysis.
• The process includes fatty acid synthesis, elongation, desaturation, activation to acyl-CoAs, mitochondrial and peroxisomal beta-oxidation, and release from lipid stores via lipolysis.
• Fatty acid oxidation is not only a bioenergetic pathway; it controls cell fate decisions such as cardiomyocyte proliferation and kidney fibrosis.
• Cancer cells frequently rewire fatty acid metabolism to support energy supply, membrane synthesis, and stem cell activity.
• Key experimental models include CRISPR knockout, point-mutation knock-in, and overexpression cell lines targeting genes such as CPT1A, ACADM, FASN, and FABP4.
• Studying this process requires integrated methods such as lipidomics, Seahorse respirometry, stable-isotope tracing, and transcriptomic or proteomic profiling.
Description
Fatty acid metabolic process (GO:0006631) is a biological process ontology term that encompasses the chemical reactions and pathways involving fatty acids, which are aliphatic monocarboxylic acids liberated from naturally occurring fats and oils by hydrolysis. This term is central to understanding how cells acquire, store, mobilize, and oxidize fatty acids for energy production, membrane biogenesis, and signaling. Fatty acids are not merely fuel molecules; their metabolic intermediates and derivatives participate in transcriptional regulation, inflammation, and cell proliferation. Consequently, dysregulation of fatty acid metabolism is implicated in a broad spectrum of human diseases, including heart failure, kidney fibrosis, obesity, and multiple cancers. For researchers, GO:0006631 provides a structured framework to annotate genes and pathways, design CRISPR-based experiments, and interpret multi-omics data in the context of lipid biology.
fatty acid metabolic process At A Glance
| GO ID | GO:0006631 |
|---|---|
| GO term | fatty acid metabolic process |
| Ontology | biological_process |
| Synonym | fatty acid metabolism |
| Major function | Chemical reactions and pathways involving fatty acids, including synthesis, elongation, desaturation, activation, esterification, lipolysis, and beta-oxidation |
| Subprocesses | Fatty acid biosynthetic process, fatty acid oxidation, fatty acid catabolic process, and regulation of fatty acid metabolic process |
| Cellular locations | Cytosol, mitochondria, peroxisomes, and endoplasmic reticulum |
| Key cofactors | Coenzyme A, NADPH, FAD, NAD+, ATP, and carnitine |
| Disease relevance | Heart regeneration, kidney fibrosis, gastric carcinogenesis, breast cancer, and metabolic disorders |
What Is GO:0006631?
According to the Gene Ontology, GO:0006631 fatty acid metabolic process is defined as the chemical reactions and pathways involving fatty acids, aliphatic monocarboxylic acids liberated from naturally occurring fats and oils by hydrolysis. In practical terms, this includes the synthesis of fatty acids from acetyl-CoA and malonyl-CoA, their elongation and desaturation, their activation to fatty acyl-CoAs, their esterification into complex lipids, their release from triglycerides via lipolysis, and their oxidative breakdown through beta-oxidation in mitochondria and peroxisomes. The term is a parent process that branches into fatty acid biosynthetic process, fatty acid oxidation, and fatty acid catabolic process, reflecting the bidirectional nature of lipid flux in cells.
Why Is fatty acid metabolic process Important in Cell Biology?
Fatty acid metabolic process is fundamental to cellular energy homeostasis, membrane architecture, and signaling, and its dysregulation is a hallmark of metabolic, cardiovascular, renal, and neoplastic diseases. Understanding this process at the molecular level enables researchers to identify therapeutic targets, interpret disease-associated mutations, and develop CRISPR-based models that mimic human pathology.
• Provides energy through mitochondrial beta-oxidation and supports ATP production in high-demand tissues such as heart and kidney.
• Supplies building blocks for membrane phospholipids, signaling lipids, and post-translational modifications.
• Controls cell proliferation and differentiation, as shown by the role of fatty acid oxidation inhibition in heart regeneration.
• Drives kidney fibrosis through defective fatty acid oxidation in renal tubular epithelial cells.
• Supports cancer cell growth and stemness, including gastric carcinogenesis and triple-negative breast cancer.
• Is a source of metabolic intermediates that can rewire energy supply chains in tumors.
• Is regulated by hormones, nutrients, and transcription factors such as PPARs and SREBP.
• Offers numerous druggable enzymes, including CPT1A, ACADM, FASN, and ACC.
• Can be studied with CRISPR screens to identify novel regulators of lipid metabolism.
• Is relevant to personalized medicine because mutations in fatty acid oxidation genes cause inherited metabolic disorders.
What Happens During fatty acid metabolic process?
Fatty acid synthesis and elongation
In simple terms: Cells build new fatty acids from small carbon units when energy is abundant.
Fatty acid synthesis begins with the carboxylation of acetyl-CoA to malonyl-CoA by acetyl-CoA carboxylase, followed by iterative condensation, reduction, dehydration, and reduction reactions catalyzed by the fatty acid synthase complex. The resulting palmitate can be further elongated and desaturated in the endoplasmic reticulum to generate diverse fatty acid species. In cancer cells, this pathway is often upregulated to meet the demand for membrane lipids and signaling molecules.
Lipolysis and fatty acid release
In simple terms: Stored fat is broken down to release free fatty acids into the circulation.
Lipolysis is the enzymatic hydrolysis of triglycerides into glycerol and free fatty acids, mediated by lipases such as adipose triglyceride lipase, hormone-sensitive lipase, and monoglyceride lipase. This process is tightly regulated by hormones and provides fatty acids for oxidation in peripheral tissues. Defects in lipolysis contribute to ectopic lipid accumulation and metabolic disease.
Fatty acid activation and transport
In simple terms: Free fatty acids are tagged with coenzyme A and shuttled into mitochondria for burning.
Once released, fatty acids are activated to fatty acyl-CoAs by acyl-CoA synthetases. Long-chain acyl-CoAs cannot cross the inner mitochondrial membrane directly; they are converted to acylcarnitines by carnitine palmitoyltransferase 1 (CPT1) and transported via the carnitine shuttle. This step is a key regulatory node in fatty acid oxidation.
Mitochondrial beta-oxidation
In simple terms: Fatty acids are chopped into two-carbon units to produce energy.
Beta-oxidation in the mitochondrial matrix removes two carbons per cycle, generating acetyl-CoA, FADH2, and NADH. Acetyl-CoA enters the TCA cycle, while the reduced cofactors feed the electron transport chain to produce ATP. Inhibition of this pathway can promote cardiomyocyte proliferation and heart regeneration in adult mice, and defective beta-oxidation in renal tubular cells drives kidney fibrosis.
Peroxisomal and omega-oxidation
In simple terms: Alternative oxidation routes handle very long-chain and branched fatty acids.
Peroxisomes oxidize very long-chain fatty acids, branched-chain fatty acids, and bile acid intermediates, transferring electrons directly to oxygen and generating hydrogen peroxide. Omega-oxidation in the endoplasmic reticulum provides a minor catabolic route for fatty acids when mitochondrial beta-oxidation is impaired. These pathways are essential for lipid homeostasis and are linked to peroxisomal disorders.
Regulation of fatty acid flux
In simple terms: Cells decide whether to make, store, or burn fat based on signals.
Fatty acid metabolism is regulated by nutrient sensors such as AMPK and mTOR, and by transcription factors including PPAR alpha, PPAR gamma, and SREBP-1c. Hormones like insulin and glucagon reciprocally control lipogenesis and lipolysis. Arf1 has been shown to coordinate fatty acid metabolism with mitochondrial homeostasis, illustrating cross-organelle regulation.
Key Genes Involved in GO:0006631 fatty acid metabolic process
The following genes encode enzymes, transporters, and regulatory proteins that directly participate in or control fatty acid metabolic process (GO:0006631).
| Gene | Major Role | Research Relevance |
|---|---|---|
| CPT1A | Carnitine palmitoyltransferase 1A; rate-limiting enzyme for mitochondrial fatty acid oxidation | Target for heart regeneration and kidney fibrosis studies |
| ACADM | Medium-chain acyl-CoA dehydrogenase; catalyzes a step in mitochondrial beta-oxidation | Model for inherited fatty acid oxidation disorders |
| FASN | Fatty acid synthase; catalyzes de novo synthesis of palmitate | Oncogenic target in multiple cancers |
| ACACA | Acetyl-CoA carboxylase alpha; commits acetyl-CoA to fatty acid synthesis | Regulation of lipogenesis and cancer metabolism |
| SCD | Stearoyl-CoA desaturase; introduces double bonds into saturated fatty acids | Membrane fluidity and cancer progression |
| FABP4 | Fatty acid binding protein 4; transports fatty acids and regulates lipid signaling | Promotes triple-negative breast cancer progression and stemness |
| PPARA | Peroxisome proliferator-activated receptor alpha; transcription factor for fatty acid oxidation genes | Regulates lipid catabolism in liver and heart |
| PPARG | Peroxisome proliferator-activated receptor gamma; master regulator of adipogenesis and lipid storage | Target for metabolic disease and cancer |
| SREBF1 | Sterol regulatory element-binding transcription factor 1; activates lipogenic genes | Lipogenesis and cancer cell growth |
| LIPE | Hormone-sensitive lipase; hydrolyzes stored triglycerides | Lipolysis regulation and metabolic disease |
| PNPLA2 | Adipose triglyceride lipase; initiates triglyceride hydrolysis | Lipolysis and lipid mobilization |
| MGLL | Monoglyceride lipase; completes lipolysis | Endocannabinoid signaling and lipid metabolism |
| ACSL1 | Acyl-CoA synthetase long-chain family member 1; activates fatty acids | Fatty acid activation and channeling |
| CPT2 | Carnitine palmitoyltransferase 2; inner mitochondrial membrane enzyme | Fatty acid oxidation disorders and energy metabolism |
| HADHA | Hydroxyacyl-CoA dehydrogenase trifunctional multienzyme complex subunit alpha | Mitochondrial beta-oxidation and cardiomyopathy |
| ACOX1 | Acyl-CoA oxidase 1; peroxisomal beta-oxidation | Peroxisomal fatty acid oxidation |
| ARF1 | ADP-ribosylation factor 1; coordinates fatty acid metabolism and mitochondrial homeostasis | Organelle crosstalk and lipid trafficking |
| UCP2 | Uncoupling protein 2; modulates mitochondrial fatty acid oxidation and ROS | Energy metabolism and cancer |
How Is fatty acid metabolic process Regulated?
Fatty acid metabolic process is regulated at multiple levels. Acutely, hormone-sensitive lipase and adipose triglyceride lipase are activated by catecholamines and inhibited by insulin, controlling fatty acid release from adipose tissue. In the liver, PPAR alpha and SREBP-1c reciprocally regulate fatty acid oxidation and synthesis in response to fasting and feeding. AMPK phosphorylates and inhibits acetyl-CoA carboxylase, reducing malonyl-CoA levels and relieving inhibition of CPT1A, thereby promoting fatty acid oxidation. mTOR complex 1 supports lipogenesis by activating SREBP-1c and PPAR gamma. Additionally, Arf1 has been shown to coordinate fatty acid metabolism with mitochondrial homeostasis, linking vesicular trafficking to lipid flux. In cancer, oncogenic signaling rewires fatty acid metabolism to support energy supply and biosynthesis.
fatty acid metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CPT1A | Heart regeneration and cardiac metabolism | Cardiomyocyte-specific knockout or overexpression in mice |
| ACADM | Medium-chain acyl-CoA dehydrogenase deficiency | Point-mutation knock-in cell lines and patient-derived fibroblasts |
| FASN | Cancer cell proliferation and lipogenesis | CRISPR knockout in cancer cell lines and xenografts |
| FABP4 | Triple-negative breast cancer progression and stemness | Knockout and overexpression in breast cancer cell lines |
| ACOX1 | Peroxisomal beta-oxidation disorders | Knockout cell models and lipidomic profiling |
Fatty acid metabolism in heart regeneration and cardiovascular disease
Inhibition of fatty acid oxidation enables heart regeneration in adult mice by promoting cardiomyocyte proliferation. This finding links GO:0006631 directly to cardiac regenerative capacity and suggests that modulating fatty acid oxidation could be a therapeutic strategy for heart failure. Defective fatty acid oxidation in renal tubular epithelial cells also has a key role in kidney fibrosis development, indicating that similar metabolic defects contribute to fibrotic diseases in multiple organs.
Fatty acid metabolism in cancer
Oncogenic fatty acid metabolism rewires the energy supply chain in gastric carcinogenesis, supporting tumor growth and survival. The multifaceted roles of fatty acid synthesis in cancer include providing membrane lipids, signaling molecules, and energy, making enzymes such as FASN and ACC attractive therapeutic targets. FABP4-mediated lipid metabolism promotes triple-negative breast cancer progression and breast cancer stem cell activity, highlighting the importance of fatty acid trafficking in aggressive cancers.
Inherited disorders of fatty acid oxidation
Mutations in genes encoding mitochondrial beta-oxidation enzymes, such as ACADM and CPT2, cause inherited fatty acid oxidation disorders that can present with hypoketotic hypoglycemia, cardiomyopathy, and sudden death. Peroxisomal beta-oxidation defects, including those affecting ACOX1, lead to very long-chain fatty acid accumulation and neurological disease. Understanding the molecular basis of these disorders is essential for diagnosis and for developing targeted therapies.
From fatty acid metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of CPT1A promote cardiomyocyte proliferation? | Cardiomyocyte-specific CPT1A knockout mouse and CRISPR knockout in iPSC-derived cardiomyocytes |
| Does defective fatty acid oxidation in renal tubular cells drive fibrosis? | Tubule-specific knockout of fatty acid oxidation genes in mice |
| Does a specific point mutation in ACADM impair enzyme activity? | CRISPR point-mutation knock-in in HEK293 or patient fibroblasts |
| Does FABP4 overexpression enhance breast cancer stem cell activity? | FABP4 overexpression and knockout in triple-negative breast cancer cell lines |
| Does FASN inhibition alter cancer cell lipid profiles? | CRISPR knockout or inducible knockdown combined with lipidomics |
| Does Arf1 regulate mitochondrial homeostasis via fatty acid metabolism? | ARF1 knockout and rescue with tagged knock-in |
How to Study the fatty acid metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Lipidomics (LC-MS) | Fatty acid species and complex lipid composition | Profiling metabolic changes in knockout cells |
| Seahorse respirometry | Oxygen consumption rate and fatty acid oxidation | Functional validation of metabolic genes |
| Stable-isotope tracing | Flux through synthesis and oxidation pathways | Quantifying metabolic rewiring in cancer |
| RNA-seq | Transcriptional changes in fatty acid metabolic genes | Identifying pathway signatures after CRISPR perturbation |
| Proteomics | Protein abundance and post-translational modifications | Validating enzyme expression changes |
| Western blot | Protein levels of key enzymes | Confirming knockout or overexpression efficiency |
| Fluorescence microscopy | Lipid droplet and mitochondrial morphology | Assessing organelle dynamics |
| CRISPR library screening | Genome-wide fitness and metabolic dependencies | Discovering novel regulators of fatty acid metabolism |
Lipidomics and mass spectrometry
Lipidomics using liquid chromatography-mass spectrometry quantifies fatty acid species, acyl-carnitines, and complex lipids, providing a snapshot of fatty acid metabolic flux. Stable-isotope tracing with 13C-labeled substrates can measure synthesis and oxidation rates in cells and tissues.
Seahorse respirometry and metabolic assays
Seahorse extracellular flux analysis measures oxygen consumption rate and extracellular acidification rate, allowing real-time assessment of fatty acid oxidation and glycolysis. These assays are commonly used to evaluate the impact of CRISPR-mediated gene knockout on mitochondrial function.
Transcriptomics and proteomics
RNA sequencing and quantitative proteomics reveal changes in expression of fatty acid metabolic genes and proteins following genetic perturbation. Pathway enrichment analysis using GO:0006631 can identify coordinated regulation of lipid metabolism.
Imaging and flux analysis
Fluorescent fatty acid analogs and genetically encoded biosensors enable visualization of lipid uptake, storage, and oxidation in live cells. Confocal and electron microscopy can assess mitochondrial morphology and lipid droplet dynamics.
How CRISPR Can Be Used to Study GO:0006631 fatty acid metabolic process
Knockout
CRISPR knockout is widely used to delete genes involved in fatty acid metabolic process, such as CPT1A, ACADM, or FASN, to study their loss-of-function phenotypes. Knockout cell lines can be subjected to lipidomics, respirometry, and proliferation assays to determine the metabolic consequences. In vivo knockout models, including cardiomyocyte-specific deletion of CPT1A, have revealed unexpected roles in heart regeneration.
Point Mutation
CRISPR point-mutation knock-in introduces precise nucleotide changes to model inherited fatty acid oxidation disorders, such as ACADM mutations, or to dissect catalytic residues in enzymes like FASN. These models are valuable for testing genotype-phenotype relationships and drug responses.
Knock-in
Knock-in of epitope tags or fluorescent reporters into endogenous loci allows real-time tracking of fatty acid metabolic enzymes and their localization. Tagged knock-in of ARF1, for example, can help study its role in coordinating fatty acid metabolism with mitochondrial homeostasis.
Overexpression
CRISPR activation or lentiviral overexpression is used to increase expression of genes such as FABP4 or FASN to model their oncogenic roles in cancer. Overexpression models help determine sufficiency of a gene in driving phenotypes like stem cell activity or lipid accumulation.
How EDITGENE Supports fatty acid metabolic process Research
Researchers studying fatty acid metabolic process-related genes often need to determine whether a candidate gene is causally involved in lipid flux, energy homeostasis, or disease phenotypes. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models that enable rigorous functional validation of genes annotated to GO:0006631.
Contact EDITGENE today to design your custom CRISPR model for fatty acid metabolic process research.
Frequently Asked Questions About fatty acid metabolic process
What is GO:0006631 fatty acid metabolic process?
GO:0006631 is a Gene Ontology biological process term defined as the chemical reactions and pathways involving fatty acids, aliphatic monocarboxylic acids liberated from naturally occurring fats and oils by hydrolysis.
What genes are involved in fatty acid metabolic process?
Key genes include CPT1A, ACADM, FASN, ACACA, SCD, FABP4, PPARA, PPARG, SREBF1, LIPE, PNPLA2, MGLL, ACSL1, CPT2, HADHA, ACOX1, ARF1, and UCP2.
Why is fatty acid metabolism important in cancer?
Cancer cells rewire fatty acid metabolism to support energy supply, membrane synthesis, and stem cell activity, making it a therapeutic target.
How does fatty acid oxidation affect heart regeneration?
Inhibition of fatty acid oxidation enables heart regeneration in adult mice by promoting cardiomyocyte proliferation.
What is the role of fatty acid metabolism in kidney fibrosis?
Defective fatty acid oxidation in renal tubular epithelial cells has a key role in kidney fibrosis development.
What are the main steps of fatty acid metabolic process?
The main steps include fatty acid synthesis, lipolysis, activation to acyl-CoAs, mitochondrial beta-oxidation, and peroxisomal oxidation.
How can CRISPR be used to study fatty acid metabolism?
CRISPR knockout, point-mutation knock-in, and overexpression models allow functional validation of genes involved in fatty acid metabolism.
What methods are used to measure fatty acid oxidation?
Seahorse respirometry, stable-isotope tracing, and lipidomics are commonly used to measure fatty acid oxidation and related metabolic fluxes.
Which diseases are linked to fatty acid metabolic process?
Diseases include heart failure, kidney fibrosis, gastric cancer, triple-negative breast cancer, and inherited fatty acid oxidation disorders.
What is the difference between fatty acid synthesis and beta-oxidation?
Fatty acid synthesis builds fatty acids from acetyl-CoA and malonyl-CoA, while beta-oxidation breaks them down to generate acetyl-CoA and energy.
Conclusion
GO:0006631 fatty acid metabolic process is a fundamental biological process that governs energy homeostasis, membrane biogenesis, and signaling. Its dysregulation is central to cardiovascular, renal, and neoplastic diseases, as demonstrated by studies showing that inhibiting fatty acid oxidation promotes heart regeneration, defective oxidation drives kidney fibrosis, and oncogenic rewiring supports tumor growth. CRISPR-based models, combined with lipidomics and metabolic assays, provide powerful tools to dissect the molecular players and therapeutic potential of this pathway. EDITGENE offers end-to-end services to generate and characterize such models, enabling researchers to translate basic findings into clinical insights.
References
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- 2. Kang HM et al.. 2015. Defective fatty acid oxidation in renal tubular epithelial cells has a key role in kidney fibrosis development.. Nat Med 21(1):37-46 PMID: 25419705
- 3. Grabner GF et al.. 2021. Lipolysis: cellular mechanisms for lipid mobilization from fat stores.. Nat Metab 3(11):1445-1465 PMID: 34799702
- 4. Enkler L et al.. 2023. Arf1 coordinates fatty acid metabolism and mitochondrial homeostasis.. Nat Cell Biol 25(8):1157-1172 PMID: 37400497
- 5. Nguyen P et al.. 2008. Liver lipid metabolism.. J Anim Physiol Anim Nutr (Berl) 92(3):272-83 PMID: 18477307
- 6. Won Y et al.. 2024. Oncogenic Fatty Acid Metabolism Rewires Energy Supply Chain in Gastric Carcinogenesis.. Gastroenterology 166(5):772-786.e14 PMID: 38272100
- 7. Röhrig F et al.. 2016. The multifaceted roles of fatty acid synthesis in cancer.. Nat Rev Cancer 16(11):732-749 PMID: 27658529
- 8. Yu L et al.. 2024. FABP4-mediated lipid metabolism promotes TNBC progression and breast cancer stem cell activity.. Cancer Lett 604:217271 PMID: 39306229
