GO:0015908 fatty acid transport: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0015908 fatty acid transport describes the directed movement of fatty acids into, out of, or within a cell, or between cells, via transporters or pores [1,3].
• Fatty acid transport is essential for energy homeostasis, membrane synthesis, and lipid signaling, and its dysfunction is linked to metabolic diseases, cancer, and cardiovascular disorders [2,5,6].
• Key protein families include FATPs (SLC27A1-6), CD36, FABPs, and carnitine shuttle components (CPT1, CACT) [1,3,8].
• The process is regulated by hormones, nutrients, and cold-induced lipokines such as 12,13-diHOME.
• Dysregulation of fatty acid transport contributes to obesity, fatty liver disease, insulin resistance, and cancer progression [2,5].
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are powerful tools to dissect the causal roles of fatty acid transport genes [2,5].
Description
Fatty acid transport (GO:0015908) is a fundamental biological process that mediates the movement of fatty acids across cellular membranes and within cells [1,3]. Fatty acids are aliphatic monocarboxylic acids liberated from naturally occurring fats and oils by hydrolysis, and their transport is critical for energy production, membrane lipid synthesis, and signaling. This process relies on a suite of specialized proteins, including fatty acid transport proteins (FATPs), fatty acid binding proteins (FABPs), and carnitine shuttle components, which ensure efficient uptake and distribution of fatty acids to various cellular compartments [1,3,8]. Researchers study fatty acid transport to understand metabolic disorders such as obesity, type 2 diabetes, and fatty liver disease, as well as cancer, where altered lipid metabolism supports tumor growth [2,5]. The GO term encompasses all directed movements of fatty acids, whether into, out of, or within a cell, and between cells, by means of some agent such as a transporter or pore [1,3]. This article provides a comprehensive overview of the mechanisms, key genes, regulation, disease relevance, and research methods associated with GO:0015908, with a focus on CRISPR-based approaches for functional validation.
fatty acid transport At A Glance
| GO ID | GO:0015908 |
|---|---|
| GO term | fatty acid transport |
| Ontology | biological_process |
| Synonym | none |
| Major function | Directed movement of fatty acids across membranes and within cells |
| Key transporters | FATPs (SLC27A1-6), CD36, FABPs, CPT1, CACT |
| Associated diseases | Obesity, fatty liver disease, insulin resistance, cancer |
| Regulation | Hormonal, nutritional, cold-induced lipokines (e.g., 12,13-diHOME) |
What Is GO:0015908?
GO:0015908 fatty acid transport is defined as the directed movement of fatty acids into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore. Fatty acids are aliphatic monocarboxylic acids liberated from naturally occurring fats and oils by hydrolysis. This process is essential for lipid homeostasis and energy metabolism [1,3].
Why Is fatty acid transport Important in Cell Biology?
Fatty acid transport is crucial for maintaining energy balance and lipid homeostasis in organisms ranging from plants to humans. In mammals, efficient fatty acid uptake and oxidation are vital for tissues such as heart, muscle, and brown adipose tissue, where fatty acids serve as major energy substrates [1,4]. Dysregulation of fatty acid transport contributes to the pathogenesis of metabolic syndrome, cardiovascular diseases, and cancer, making it a prime target for therapeutic intervention [2,5,6].
• Essential for energy production via fatty acid oxidation in mitochondria.
• Critical for membrane lipid synthesis and cell signaling.
• Dysregulation leads to obesity and insulin resistance.
• Implicated in non-alcoholic fatty liver disease (NAFLD).
• Altered in many cancers to support tumor growth.
• Cold-induced lipokine 12,13-diHOME enhances fatty acid transport into brown adipose tissue.
• Plant fatty acid transport is vital for seed oil production and stress responses.
• Target for drugs treating metabolic disorders.
• Provides insights into nutritional regulation of lipid metabolism.
• CRISPR screens can identify novel regulators of fatty acid transport.
What Happens During fatty acid transport?
Uptake across the plasma membrane
In simple terms: Fatty acids from the blood enter cells with the help of transporter proteins.
Fatty acid uptake is mediated by membrane proteins such as CD36 and the SLC27 family of fatty acid transport proteins (FATPs), which facilitate the translocation of fatty acids across the plasma membrane [3,8]. This step is particularly important in tissues with high fatty acid demand, such as heart, muscle, and adipose tissue. The cold-induced lipokine 12,13-diHOME promotes fatty acid transport into brown adipose tissue by enhancing the activity of these transporters.
Intracellular trafficking and activation
In simple terms: Once inside, fatty acids are shuttled to different parts of the cell and prepared for use.
Inside the cell, fatty acids are bound by fatty acid binding proteins (FABPs) that facilitate their transport to various organelles, including mitochondria, peroxisomes, and the endoplasmic reticulum. For mitochondrial oxidation, fatty acids are activated to acyl-CoA and then converted to acylcarnitines by carnitine palmitoyltransferase 1 (CPT1) for entry into mitochondria via the carnitine shuttle.
Mitochondrial entry and oxidation
In simple terms: Fatty acids are carried into mitochondria where they are burned for energy.
The carnitine shuttle, involving CPT1, carnitine-acylcarnitine translocase (CACT), and CPT2, transports acylcarnitines into the mitochondrial matrix for beta-oxidation. This process is essential for energy production, especially during fasting or cold exposure [1,4].
Export and intercellular transport
In simple terms: Fatty acids can also move out of cells or between cells.
Fatty acids and their derivatives can be exported from cells via transporters such as ABCA1 or through diffusion, and they can also be transported between cells, for example, from adipocytes to other tissues. In plants, fatty acid transport between organelles and across membranes is mediated by specific proteins and is crucial for lipid biosynthesis.
Key Genes Involved in GO:0015908 fatty acid transport
The following genes encode proteins that directly mediate or regulate fatty acid transport, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC27A1 (FATP1) | Fatty acid transport protein 1; enhances uptake of long-chain fatty acids | Insulin sensitivity, obesity [3,8] |
| SLC27A2 (FATP2) | Fatty acid transport protein 2; involved in hepatic fatty acid uptake | Fatty liver disease, cancer [2,5] |
| SLC27A4 (FATP4) | Fatty acid transport protein 4; major transporter in intestine and skin | Obesity, fatty liver, skin disorders |
| CD36 | Membrane glycoprotein that facilitates fatty acid uptake | Cardiovascular disease, insulin resistance |
| FABP1 (L-FABP) | Liver fatty acid binding protein; intracellular transport | Hepatic lipid metabolism |
| FABP4 (A-FABP) | Adipocyte fatty acid binding protein; intracellular transport | Obesity, diabetes |
| CPT1A | Carnitine palmitoyltransferase 1A; mitochondrial entry of fatty acids | Fatty acid oxidation disorders |
| CPT2 | Carnitine palmitoyltransferase 2; mitochondrial beta-oxidation | CPT2 deficiency |
| SLC25A20 (CACT) | Carnitine-acylcarnitine translocase; mitochondrial transport | CACT deficiency |
| ACSL1 | Acyl-CoA synthetase long-chain 1; activates fatty acids | Lipid metabolism |
| ACADM | Medium-chain acyl-CoA dehydrogenase; beta-oxidation | MCAD deficiency |
| HADHA | Hydroxyacyl-CoA dehydrogenase; beta-oxidation | Mitochondrial trifunctional protein deficiency |
| SLC27A6 (FATP6) | Fatty acid transport protein 6; heart-specific | Cardiac lipid metabolism |
| SLC27A3 (FATP3) | Fatty acid transport protein 3; involved in lipid synthesis | Metabolic disorders |
| SLC27A5 (FATP5) | Fatty acid transport protein 5; liver-specific | Bile acid metabolism |
| DGAT1 | Diacylglycerol O-acyltransferase 1; esterification of fatty acids | Lipid storage, obesity |
| LPL | Lipoprotein lipase; releases fatty acids from lipoproteins | Hyperlipidemia |
How Is fatty acid transport Regulated?
Fatty acid transport is regulated at multiple levels, including transcriptional control by nuclear receptors such as PPARs and SREBP-1c, which respond to nutritional and hormonal signals [3,6]. Post-translational modifications, such as phosphorylation and ubiquitination, modulate the activity and localization of transporters like CD36 and FATP1. Hormones like insulin promote fatty acid uptake in adipose tissue, while cold exposure induces the secretion of 12,13-diHOME, which enhances fatty acid transport into brown adipose tissue. In plants, fatty acid transport is regulated by developmental and environmental cues.
fatty acid transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC27A1 (FATP1) | Obesity, insulin resistance | Knockout mouse, adipocyte-specific overexpression |
| SLC27A2 (FATP2) | NAFLD, cancer | Liver-specific knockout, xenograft models |
| CD36 | Cardiovascular disease, insulin resistance | CD36 knockout mice, cardiomyocyte-specific overexpression |
| CPT1A | CPT1A deficiency | Patient-derived fibroblasts, knock-in mouse models |
| SLC25A20 (CACT) | CACT deficiency | Knockout mouse, induced pluripotent stem cells |
Metabolic disorders
Dysregulation of fatty acid transport is a hallmark of obesity, insulin resistance, and type 2 diabetes. Overexpression of FATPs, particularly FATP1 and FATP4, is associated with increased lipid accumulation and impaired insulin signaling [5,8]. In non-alcoholic fatty liver disease (NAFLD), elevated hepatic fatty acid uptake via FATP2 and CD36 contributes to steatosis and inflammation [2,5].
Cancer
Many cancers reprogram lipid metabolism to support rapid proliferation. Upregulation of fatty acid transport proteins, such as FATP2 and CD36, has been observed in various tumors and correlates with poor prognosis. Targeting fatty acid transport is being explored as a therapeutic strategy in oncology.
Cardiovascular diseases
In the heart, fatty acid transport is essential for energy production, but excessive uptake can lead to lipotoxicity and cardiomyopathy. CD36 and FATP6 play key roles in cardiac fatty acid uptake, and their dysregulation is implicated in heart failure and ischemic injury [6,8].
Inherited fatty acid oxidation disorders
Mutations in genes involved in mitochondrial fatty acid transport and oxidation, such as CPT1A, CPT2, and SLC25A20, cause severe metabolic disorders presenting with hypoketotic hypoglycemia, cardiomyopathy, and sudden death.
From fatty acid transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of FATP4 reduce intestinal fatty acid uptake? | SLC27A4 knockout mice or Caco-2 cells with CRISPR knockout |
| Does a point mutation in CD36 affect fatty acid transport? | CRISPR point mutation in CD36 in cell lines or mice |
| Can overexpression of FATP1 enhance lipid accumulation? | Transgenic overexpression of SLC27A1 in adipocytes |
| What is the role of CPT1A in mitochondrial fatty acid oxidation? | CRISPR knockout of CPT1A in hepatocytes |
| Does 12,13-diHOME increase fatty acid transport in brown adipocytes? | Brown adipocyte cell lines treated with 12,13-diHOME, with or without FATP knockout |
| Can CRISPR activation of SLC27A2 improve fatty acid uptake? | CRISPRa in liver cells or organoids |
How to Study the fatty acid transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Genes required for fatty acid uptake | Identify novel transporters in cancer cells |
| BODIPY-palmitate uptake assay | Rate of fatty acid transport | Validate candidate genes in vitro |
| RNA-seq | Transcriptional changes in fatty acid transport genes | Assess regulation by nutrients or hormones |
| Proteomics | Protein expression and interactions | Map fatty acid transport complexes |
| 13C-fatty acid tracing | Metabolic flux through oxidation | Measure functional impact of gene knockouts |
| Immunofluorescence | Subcellular localization of transporters | Study trafficking and membrane dynamics |
| Western blot | Protein levels of FATPs, CD36, etc. | Confirm knockout or overexpression |
| CRISPR activation (CRISPRa) | Upregulation of endogenous genes | Enhance fatty acid transport for bioproduction |
CRISPR knockout screens
Genome-wide CRISPR knockout screens can identify genes essential for fatty acid transport. For example, a screen in cancer cells cultured with fluorescently labeled fatty acids can reveal transporters required for uptake.
Fluorescent fatty acid uptake assays
Cellular fatty acid transport can be measured using fluorescent fatty acid analogs (e.g., BODIPY-palmitate) and flow cytometry or microscopy. This method is widely used to validate candidate transporters identified in screens.
Proteomics and interactomics
Mass spectrometry-based proteomics can quantify expression of fatty acid transport proteins and identify interaction partners, providing insights into regulatory complexes.
Metabolic flux analysis
Isotope tracing with 13C-labeled fatty acids coupled with mass spectrometry measures uptake and oxidation rates, revealing functional consequences of genetic perturbations.
How CRISPR Can Be Used to Study GO:0015908 fatty acid transport
Knockout
CRISPR knockout of fatty acid transport genes (e.g., SLC27A4, CD36) in cell lines or animal models abolishes specific transport activities, allowing researchers to determine their contribution to lipid uptake and metabolism [2,5].
Point Mutation
Introducing point mutations in transport proteins (e.g., CD36 variants) can mimic human polymorphisms and reveal how single amino acid changes affect fatty acid binding and transport efficiency.
Knock-in
Knock-in of tagged versions of transporters (e.g., GFP-FATP1) enables live-cell imaging and proteomic analysis of trafficking and interactions.
Overexpression
CRISPR-mediated overexpression (e.g., via CRISPRa) or transgenic expression of fatty acid transporters can enhance lipid accumulation and study gain-of-function effects in metabolic diseases and cancer [2,5].
How EDITGENE Supports fatty acid transport Research
Researchers studying fatty acid transport-related genes often need to determine whether a candidate gene is causally involved in lipid uptake, trafficking, or metabolism. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation of genes associated with GO:0015908.
Contact EDITGENE today to design your custom CRISPR model for fatty acid transport research.
Frequently Asked Questions About fatty acid transport
What is GO:0015908 fatty acid transport?
GO:0015908 is a Gene Ontology term describing the directed movement of fatty acids into, out of, or within a cell, or between cells, by means of transporters or pores [1,3].
What genes are involved in fatty acid transport?
Key genes include SLC27A1-6 (FATPs), CD36, FABPs, CPT1A, CPT2, and SLC25A20 (CACT) [1,3,8].
How is fatty acid transport regulated?
It is regulated by hormones (insulin), nuclear receptors (PPARs), and cold-induced lipokines like 12,13-diHOME [3,4,6].
What diseases are associated with defective fatty acid transport?
Obesity, insulin resistance, NAFLD, cardiovascular diseases, and inherited fatty acid oxidation disorders [1,2,5,6].
What methods are used to study fatty acid transport?
CRISPR screens, fluorescent fatty acid uptake assays, proteomics, and metabolic flux analysis [2,4,6].
Can CRISPR be used to study fatty acid transport genes?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect gene function [2,5].
What is the role of CD36 in fatty acid transport?
CD36 is a membrane glycoprotein that facilitates fatty acid uptake, particularly in heart and adipose tissue.
How does 12,13-diHOME affect fatty acid transport?
12,13-diHOME is a cold-induced lipokine that promotes fatty acid transport into brown adipose tissue.
What are FATPs?
FATPs (fatty acid transport proteins) are a family of membrane proteins (SLC27A1-6) that enhance cellular fatty acid uptake [3,8].
Why is fatty acid transport important in cancer?
Cancer cells often upregulate fatty acid transport to support rapid proliferation and survival.
Conclusion
Fatty acid transport (GO:0015908) is a vital biological process with broad implications for energy metabolism, membrane biology, and disease. Understanding its molecular players and regulatory mechanisms is essential for developing therapies against metabolic disorders and cancer. CRISPR-based models offer powerful tools to dissect the causal roles of specific genes, and EDITGENE provides end-to-end services to accelerate such research.
References
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- 2. Acharya R et al.. 2023. Fatty acid transport proteins (FATPs) in cancer.. Chem Phys Lipids 250:105269 PMID: 36462545
- 3. Gimeno RE. 2007. Fatty acid transport proteins.. Curr Opin Lipidol 18(3):271-6 PMID: 17495600
- 4. Lynes MD et al.. 2017. The cold-induced lipokine 12,13-diHOME promotes fatty acid transport into brown adipose tissue.. Nat Med 23(5):631-637 PMID: 28346411
- 5. Li H et al.. 2022. Role of fatty acid transport protein 4 in metabolic tissues: insights into obesity and fatty liver disease.. Biosci Rep 42(6) PMID: 35583196
- 6. Hajri T et al.. 2002. Fatty acid transport across membranes: relevance to nutrition and metabolic pathology.. Annu Rev Nutr 22:383-415 PMID: 12055351
- 7. Li N et al.. 2016. Fatty Acid and Lipid Transport in Plant Cells.. Trends Plant Sci 21(2):145-158 PMID: 26616197
- 8. Anderson CM et al.. 2013. SLC27 fatty acid transport proteins.. Mol Aspects Med 34(2-3):516-28 PMID: 23506886
