GO:0070543 response to linoleic acid: Cellular Signaling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070543 (response to linoleic acid) describes any cellular or organismal process that changes state or activity in response to a linoleic acid stimulus, including movement, secretion, enzyme production, and gene expression.
• Linoleic acid (LA), an essential omega-6 polyunsaturated fatty acid, modulates immune cell metabolic fitness and antitumor immunity, particularly in CD8+ T cells.
• The response to LA is highly context-dependent: it can potentiate chemotherapy in biliary tract cancer via RARγ activation, but high red blood cell LA levels predict poor neoadjuvant chemotherapy response in HER2-positive breast cancer.
• Genetic variation, such as FADS1 genotype, determines whether dietary LA elicits a pro-inflammatory or anti-inflammatory response.
• LA induces metabolic reprogramming and inhibits oxidative and inflammatory effects in UVB-exposed keratinocytes, and it can enhance insulin response in MDA-MB-231 breast cancer cells.
• Studying GO:0070543 requires integrated approaches including CRISPR knockout, point mutation, knock-in, overexpression, and CRISPR library screening to dissect causal genes and pathways.
Description
The Gene Ontology (GO) term GO:0070543, response to linoleic acid, defines the collection of biological processes by which a cell or organism reacts to linoleic acid (LA), an essential omega-6 polyunsaturated fatty acid. According to QuickGO, this term encompasses changes in movement, secretion, enzyme production, gene expression, and other activities triggered by an LA stimulus. LA is not merely a structural membrane component; it acts as a signaling molecule that influences immune function, metabolism, and cancer progression. For researchers, GO:0070543 provides a framework to systematically investigate how LA modulates cellular behavior across diverse biological contexts, from antitumor immunity to chemotherapy response [1,2]. The importance of this GO term is underscored by its broad physiological and pathological relevance. LA potentiates CD8+ T cell metabolic fitness and antitumor immunity, suggesting a role in immuno-oncology. In biliary tract cancer, LA enhances chemotherapy response through RARγ activation. Conversely, high LA levels in red blood cells predict poor neoadjuvant chemotherapy outcomes in HER2-positive breast cancer patients. Genetic factors, such as FADS1 genotype, determine the inflammatory response to dietary LA. These findings highlight the need for precise mechanistic studies to understand context-dependent effects of LA. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of GO:0070543. We cover the definition, key genes, regulatory mechanisms, disease associations, and experimental models, including CRISPR-based approaches. By integrating these insights, we aim to support researchers in designing robust studies to dissect the response to linoleic acid and its therapeutic implications.
response to linoleic acid At A Glance
| GO ID | GO:0070543 |
|---|---|
| GO term | response to linoleic acid |
| Ontology | biological_process |
| Synonym | response to linoleate |
| Definition | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a linoleic acid stimulus. |
| Major function | Mediates cellular and organismal responses to linoleic acid, including metabolic reprogramming, immune modulation, and gene expression changes. |
| Related stimuli | Linoleic acid (18:2 n-6), an essential omega-6 polyunsaturated fatty acid. |
| Taxonomic range | Applicable to all organisms that respond to linoleic acid, from fungi to humans. |
| Evidence examples | CD8+ T cell metabolic fitness, chemotherapy response in biliary tract cancer, inflammatory response dependent on FADS1 genotype. |
What Is GO:0070543?
GO:0070543 (response to linoleic acid) is a biological process term defined as any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a linoleic acid stimulus. The synonym response to linoleate is also used. This term captures the diverse cellular and systemic reactions to LA, an essential fatty acid that serves both as a metabolic substrate and a signaling molecule [1,3].
Why Is response to linoleic acid Important in Cell Biology?
Understanding GO:0070543 is critical because linoleic acid is the most abundant polyunsaturated fatty acid in many human diets and has profound effects on health and disease. It modulates immune responses, cancer progression, and metabolic regulation [1,2,5]. The response to LA is highly context-dependent and influenced by genetic background, such as FADS1 polymorphisms. Elucidating the mechanisms of this response can inform nutritional recommendations, cancer therapies, and immunotherapies. Moreover, LA is a ligand for nuclear receptors and can activate signaling pathways, making it a potential therapeutic target. Research into GO:0070543 also intersects with studies on inflammation, oxidative stress, and metabolic reprogramming [6,8].
• Linoleic acid potentiates CD8+ T cell metabolic fitness and antitumor immunity, highlighting its role in cancer immunotherapy.
• LA enhances chemotherapy response in biliary tract cancer through RARγ activation, suggesting a therapeutic strategy.
• Dietary LA's inflammatory effects depend on FADS1 genotype, linking genetics to personalized nutrition.
• High red blood cell LA levels predict poor neoadjuvant chemotherapy response in HER2-positive breast cancer.
• LA induces metabolic reprogramming and inhibits oxidative and inflammatory effects in UVB-exposed keratinocytes.
• SARS-CoV-2 spike variants differ in their allosteric responses to LA, implicating LA in viral entry or pathogenesis.
• LA increases insulin response in MDA-MB-231 breast cancer cells, connecting LA to metabolic signaling.
• Fungal physiological responses to LA supplementation demonstrate conservation of LA response across kingdoms.
• LA is an essential fatty acid, so its effects are relevant to human nutrition and public health.
• CRISPR-based models can dissect causal genes in the LA response, accelerating therapeutic discovery.
What Happens During response to linoleic acid?
Linoleic Acid Sensing and Uptake
In simple terms: Cells first recognize and take in linoleic acid from their environment.
The response to linoleic acid begins with its availability and uptake. LA can be sensed by membrane receptors or transported into cells, where it can be metabolized or act as a signaling molecule. In CD8+ T cells, LA potentiates metabolic fitness, suggesting uptake and utilization. In keratinocytes, LA induces metabolic reprogramming, indicating cellular sensing and response. The exact sensing mechanisms may involve fatty acid transporters and nuclear receptors, but specific details depend on cell type.
Metabolic Reprogramming
In simple terms: Linoleic acid changes how cells produce and use energy.
LA induces metabolic reprogramming in various cell types. In CD8+ T cells, LA enhances metabolic fitness, which supports antitumor immunity. In keratinocytes exposed to UVB, LA inhibits oxidative and inflammatory effects while inducing metabolic changes. In MDA-MB-231 breast cancer cells, LA increases insulin response, linking LA to glucose metabolism. These metabolic shifts are central to the response to LA and can influence cell survival, proliferation, and function.
Gene Expression and Signaling Changes
In simple terms: Linoleic acid turns genes on or off and activates signaling pathways.
LA modulates gene expression and signaling. In biliary tract cancer, LA potentiates chemotherapy response through RARγ activation, a nuclear receptor that regulates transcription. Inflammatory responses to dietary LA depend on FADS1 genotype, indicating genetic regulation of gene expression. In SARS-CoV-2, spike variants differ in allosteric responses to LA, suggesting LA can alter protein conformation and function. These changes in gene expression and signaling underlie the diverse effects of LA.
Immune and Inflammatory Modulation
In simple terms: Linoleic acid can boost or dampen immune and inflammatory responses.
LA has immunomodulatory effects. It potentiates CD8+ T cell metabolic fitness and antitumor immunity, enhancing immune responses. Conversely, in keratinocytes, LA inhibits oxidative and inflammatory effects induced by UVB. The inflammatory response to dietary LA is influenced by FADS1 genotype, with some individuals mounting stronger inflammatory responses. These context-dependent effects highlight the complexity of LA's role in immunity and inflammation.
Cellular Stress and Survival Responses
In simple terms: Linoleic acid helps cells cope with stress and survive.
LA can influence cellular stress responses and survival. In keratinocytes, LA inhibits oxidative effects, potentially protecting against UVB-induced damage. In cancer cells, LA can promote survival and chemotherapy resistance, as seen in HER2-positive breast cancer where high LA levels predict poor response. In MDA-MB-231 cells, LA increases insulin response, which may support survival under metabolic stress. These responses are critical for understanding how LA affects cell fate.
Key Genes Involved in GO:0070543 response to linoleic acid
The following genes and proteins have been implicated in the response to linoleic acid (GO:0070543) based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FADS1 | Fatty acid desaturase 1, involved in LA metabolism | FADS1 genotype determines inflammatory response to dietary LA |
| RARγ | Retinoic acid receptor gamma, nuclear receptor | LA potentiates chemotherapy in biliary tract cancer via RARγ activation |
| CD8+ T cell markers (e.g., CD8A) | T cell effector function | LA potentiates CD8+ T cell metabolic fitness and antitumor immunity |
| Insulin receptor (INSR) | Insulin signaling | LA increases insulin response in MDA-MB-231 breast cancer cells |
| SARS-CoV-2 spike protein | Viral entry protein | Spike variants differ in allosteric responses to LA |
| Metarhizium rileyi genes | Fungal physiological response | LA supplementation affects fungal physiology |
| Keratinocyte markers (e.g., KRT14) | Skin cell structural and stress response | LA induces metabolic reprogramming in UVB-exposed keratinocytes |
| HER2 (ERBB2) | Receptor tyrosine kinase | High LA levels predict poor chemotherapy response in HER2-positive breast cancer |
| PPARs | Nuclear receptors | Potential mediators of LA signaling (implied by RARγ involvement) |
| SCD1 | Stearoyl-CoA desaturase | May influence LA metabolism (generic, not directly cited) |
| ELOVL2/5 | Fatty acid elongases | May influence LA metabolism (generic, not directly cited) |
| FADS2 | Fatty acid desaturase 2 | May influence LA metabolism (generic, not directly cited) |
| COX-2 (PTGS2) | Prostaglandin synthesis | May mediate inflammatory effects of LA (generic, not directly cited) |
| 5-LOX (ALOX5) | Leukotriene synthesis | May mediate inflammatory effects of LA (generic, not directly cited) |
| NF-κB | Transcription factor | May mediate inflammatory responses to LA (generic, not directly cited) |
| mTOR | Metabolic regulator | May mediate LA-induced metabolic fitness (generic, not directly cited) |
How Is response to linoleic acid Regulated?
The response to linoleic acid is regulated at multiple levels. Genetic factors, such as FADS1 genotype, determine the inflammatory response to dietary LA. Nuclear receptors like RARγ mediate transcriptional responses to LA in biliary tract cancer. Metabolic regulators such as mTOR may integrate LA signals to modulate metabolic fitness in CD8+ T cells. Additionally, LA can allosterically modulate proteins like the SARS-CoV-2 spike, influencing viral behavior. These regulatory mechanisms are context-dependent and vary by cell type and physiological state.
response to linoleic acid and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FADS1 | Inflammation, cardiovascular disease | Knock-in of FADS1 variants in cell lines to study LA response |
| RARγ | Biliary tract cancer, chemotherapy response | Knockout or overexpression in biliary cancer cell lines |
| HER2 (ERBB2) | HER2-positive breast cancer, chemotherapy resistance | Knockout in HER2+ breast cancer cells to assess LA effects |
| INSR | Metabolic syndrome, breast cancer | Point mutation or knockout in MDA-MB-231 cells |
| SARS-CoV-2 spike | COVID-19, viral entry | Knock-in of spike variants in ACE2-expressing cells |
Cancer and Chemotherapy Response
Linoleic acid plays a complex role in cancer. It potentiates CD8+ T cell metabolic fitness and antitumor immunity, suggesting a beneficial role in immunotherapy. In biliary tract cancer, LA enhances chemotherapy response through RARγ activation. However, high LA levels in red blood cells predict poor neoadjuvant chemotherapy response in HER2-positive breast cancer patients. In MDA-MB-231 breast cancer cells, LA increases insulin response, which may promote tumor growth. These contrasting effects highlight the need for context-specific therapeutic strategies.
Inflammation and Skin Biology
LA modulates inflammatory responses. Dietary LA's inflammatory effect depends on FADS1 genotype, with some individuals experiencing increased inflammation. In keratinocytes exposed to UVB, LA inhibits oxidative and inflammatory effects, suggesting a protective role in skin. These findings indicate that LA can be both pro- and anti-inflammatory depending on the tissue and genetic background.
Infectious Disease and Viral Pathogenesis
LA interacts with viral proteins. SARS-CoV-2 spike variants differ in their allosteric responses to LA, which may influence viral entry or immune evasion. This suggests that LA could modulate viral pathogenesis and that spike variants may have differential sensitivity to LA, with implications for vaccine and therapeutic design.
Metabolic and Fungal Physiology
LA affects metabolic processes. In MDA-MB-231 breast cancer cells, LA increases insulin response, linking LA to glucose metabolism. In the fungus Metarhizium rileyi, LA supplementation alters physiological responses, demonstrating conservation across kingdoms. These metabolic effects may have implications for obesity, diabetes, and fungal infections.
From response to linoleic acid-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does FADS1 genotype alter inflammatory response to LA? | Knock-in of FADS1 variants in human cell lines |
| Is RARγ required for LA-mediated chemotherapy sensitization? | RARγ knockout in biliary tract cancer cells |
| Does LA enhance CD8+ T cell metabolic fitness via a specific gene? | CRISPR knockout screen in primary CD8+ T cells |
| Can LA increase insulin response through INSR mutations? | Point mutation of INSR in MDA-MB-231 cells |
| Do SARS-CoV-2 spike variants differ in LA binding? | Knock-in of spike variants in HEK293T cells |
| Does LA protect keratinocytes from UVB via antioxidant genes? | Overexpression of candidate genes in keratinocytes |
How to Study the response to linoleic acid Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify transcriptional response to LA [1,6] |
| Metabolomics | Metabolite levels and fluxes | Measure metabolic reprogramming by LA [4,8] |
| CRISPR knockout screen | Gene essentiality for LA response | Discover regulators of LA-induced phenotypes [1,2] |
| CRISPR activation screen | Gene overexpression effects | Identify genes that enhance LA response |
| Proteomics | Protein abundance and modifications | Detect signaling changes upon LA stimulation |
| Lipidomics | Lipid species and composition | Assess LA uptake and metabolism |
| Structural biology (cryo-EM, NMR) | Protein-ligand interactions | Study LA binding to spike protein |
| Flow cytometry | Cell surface markers and function | Measure CD8+ T cell fitness after LA treatment |
Transcriptomics and RNA-seq
RNA sequencing can identify global gene expression changes in response to linoleic acid. For example, LA induces metabolic reprogramming in keratinocytes, which can be dissected by RNA-seq. In CD8+ T cells, LA potentiates metabolic fitness, and RNA-seq can reveal underlying transcriptional programs. This method is useful for discovering novel genes involved in GO:0070543.
Metabolomics and Lipidomics
Metabolomic and lipidomic profiling measure changes in metabolites and lipids upon LA stimulation. LA supplementation alters fungal physiology, which can be monitored by metabolomics. In cancer cells, LA increases insulin response, and metabolomics can reveal shifts in glucose metabolism. These methods provide a functional readout of the response to LA.
CRISPR Screening
Genome-wide CRISPR knockout or activation screens can identify genes essential for the response to LA. For instance, a screen in CD8+ T cells could uncover regulators of LA-induced metabolic fitness. Similarly, screens in cancer cells can identify determinants of LA-mediated chemotherapy response. This unbiased approach accelerates gene discovery.
Protein Interaction and Structural Studies
LA can allosterically modulate proteins, as shown for SARS-CoV-2 spike variants. Structural biology and biophysical assays can reveal how LA binds and alters protein function. These methods are critical for understanding the molecular basis of LA sensing and signaling.
How CRISPR Can Be Used to Study GO:0070543 response to linoleic acid
Knockout
CRISPR knockout is used to delete candidate genes and assess their requirement for the response to linoleic acid. For example, knocking out RARγ in biliary tract cancer cells can test whether LA-mediated chemotherapy sensitization depends on this receptor. Similarly, knockout of FADS1 can reveal its role in inflammatory responses to LA. Knockout models provide definitive loss-of-function evidence.
Point Mutation
CRISPR point mutation introduces specific nucleotide changes to model genetic variants. For instance, the FADS1 genotype affects inflammatory response to dietary LA; introducing the risk variant via point mutation can recapitulate the phenotype. Point mutations in INSR can test how LA increases insulin response in breast cancer cells. This approach is ideal for studying SNPs and functional domains.
Knock-in
CRISPR knock-in allows insertion of tags or reporter genes to track endogenous proteins. For example, knocking in a fluorescent tag at the RARγ locus can monitor its activation by LA in live cells. Knock-in of SARS-CoV-2 spike variants can assess differential allosteric responses to LA. This method preserves native regulation and expression.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression enables gain-of-function studies. Overexpressing candidate genes such as FADS1 or RARγ can test whether they are sufficient to enhance LA responses [2,3]. In keratinocytes, overexpression of antioxidant genes can mimic LA's protective effects against UVB. Overexpression models complement knockout studies.
How EDITGENE Supports response to linoleic acid Research
Researchers studying response to linoleic acid-related genes often need to determine whether a candidate gene is causally involved in the cellular response to LA. EDITGENE provides comprehensive CRISPR gene editing services to accelerate this discovery process, from knockout to knock-in and library screening.
Contact EDITGENE today to design your custom CRISPR model for response to linoleic acid research.
Frequently Asked Questions About response to linoleic acid
What is GO:0070543 response to linoleic acid?
GO:0070543 is a Gene Ontology biological process term defined as any process that results in a change in state or activity of a cell or an organism as a result of a linoleic acid stimulus, including movement, secretion, enzyme production, and gene expression.
What genes are involved in the response to linoleic acid?
Key genes include FADS1, which determines inflammatory responses to dietary LA, RARγ, which mediates chemotherapy sensitization in biliary tract cancer, and CD8+ T cell markers that support metabolic fitness.
How does linoleic acid affect cancer?
LA can potentiate antitumor immunity via CD8+ T cells and enhance chemotherapy in biliary tract cancer, but high LA levels predict poor chemotherapy response in HER2-positive breast cancer.
What is the role of FADS1 in linoleic acid response?
FADS1 genotype influences the inflammatory response to dietary linoleic acid, with certain variants associated with increased inflammation.
Can linoleic acid modulate immune function?
Yes, LA potentiates CD8+ T cell metabolic fitness and antitumor immunity, enhancing immune responses.
What experimental models are used to study response to linoleic acid?
Common models include CRISPR knockout, point mutation, knock-in, and overexpression cell lines, as well as CRISPR library screens [1,2,3].
How does linoleic acid affect keratinocytes?
LA induces metabolic reprogramming and inhibits oxidative and inflammatory effects in UVB-exposed keratinocytes.
Is linoleic acid response conserved across species?
Yes, fungi such as Metarhizium rileyi also respond to LA supplementation, indicating conservation.
What is the link between linoleic acid and insulin response?
In MDA-MB-231 breast cancer cells, LA increases insulin response, suggesting a role in metabolic signaling.
How does linoleic acid interact with SARS-CoV-2?
SARS-CoV-2 spike variants differ in their allosteric responses to LA, which may affect viral entry or pathogenesis.
Conclusion
GO:0070543 (response to linoleic acid) encompasses a complex and context-dependent set of cellular and organismal processes. From immune modulation and cancer therapy to inflammation and viral pathogenesis, linoleic acid exerts diverse effects that are influenced by genetic background and tissue type [1,2,3,5,6,7,8]. Understanding these mechanisms is essential for developing targeted interventions in nutrition, oncology, and infectious disease. CRISPR-based models, combined with multi-omics approaches, offer powerful tools to dissect the causal genes and pathways involved. EDITGENE provides comprehensive services to support such research, from knockout to library screening, enabling precise and efficient discovery.
References
- 1. Nava Lauson CB et al.. 2023. Linoleic acid potentiates CD8(+) T cell metabolic fitness and antitumor immunity.. Cell Metab 35(4):633-650.e9 PMID: 36898381
- 2. Yao Y et al.. 2025. Linoleic Acid Potentiates Response to Chemotherapy in Biliary Tract Cancer Through RARγ Activation.. FASEB J 39(22):e71232 PMID: 41229376
- 3. Lankinen MA et al.. 2019. Inflammatory response to dietary linoleic acid depends on FADS1 genotype.. Am J Clin Nutr 109(1):165-175 PMID: 30624587
- 4. Sánchez-Rey LE et al.. 2024. Physiological response of Metarhizium rileyi with linoleic acid supplementation.. Fungal Biol 128(4):1827-1835 PMID: 38876535
- 5. Valenzuela R et al.. 2024. High linoleic acid levels in red blood cells predict a poor response to neoadjuvant chemotherapy in human epidermal growth factor receptor type 2-positive breast cancer patients.. Nutrition 121:112357 PMID: 38430738
- 6. Manosalva C et al.. 2024. Linoleic Acid Induces Metabolic Reprogramming and Inhibits Oxidative and Inflammatory Effects in Keratinocytes Exposed to UVB Radiation.. Int J Mol Sci 25(19) PMID: 39408715
- 7. Oliveira ASF et al.. 2023. SARS-CoV-2 spike variants differ in their allosteric responses to linoleic acid.. J Mol Cell Biol 15(3) PMID: 36990513
- 8. Rodriguez-Monterrosas C et al.. 2018. Linoleic acid induces an increased response to insulin in MDA-MB-231 breast cancer cells.. J Cell Biochem 119(7):5413-5425 PMID: 29363790
