GO:0048387 negative regulation of retinoic acid receptor signaling pathway: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0048387 describes any process that stops, prevents, or reduces the frequency, rate or extent of retinoic acid receptor (RAR) signaling pathway activity.
• Negative regulation of RAR signaling is essential for balancing differentiation, proliferation, and apoptosis in development and adult tissues.
• Key negative regulators include RARRES2, which can modulate lipid metabolic reprogramming and brain metastasis in triple-negative breast cancer.
• The RAR signaling pathway is a nuclear receptor pathway, and its negative regulation often involves corepressors, phosphorylation events, and feedback loops.
• Dysregulation of RAR signaling is linked to cancers, metabolic disorders, and developmental defects, making it a target for therapeutic intervention [3,7].
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are powerful tools to dissect the causal roles of negative regulators in this pathway [3,7].
Description
The retinoic acid receptor (RAR) signaling pathway is a fundamental nuclear receptor signaling cascade that controls gene expression in response to retinoic acid (RA), a vitamin A derivative. This pathway is critical for embryonic development, cell differentiation, and tissue homeostasis. GO:0048387, negative regulation of retinoic acid receptor signaling pathway, encompasses any process that stops, prevents, or reduces the frequency, rate or extent of RAR signaling activity. Understanding this negative regulation is crucial because it provides a layer of control that prevents excessive or inappropriate signaling, which can lead to diseases such as cancer and metabolic disorders [3,7]. Research into negative regulation of RAR signaling has revealed diverse mechanisms, including the action of negative regulators like RARRES2, which was shown to regulate lipid metabolic reprogramming and mediate brain metastasis in triple-negative breast cancer. Additionally, studies on RAR-alpha-mediated signaling have demonstrated its involvement in induction of CD38 cell-surface antigen, highlighting the pathway's role in immune and hematopoietic cells. The precise balance between positive and negative regulation ensures proper cellular responses to retinoic acid. For researchers, GO:0048387 represents a focal point for understanding how cells fine-tune nuclear receptor signaling. By identifying and characterizing negative regulators, scientists can develop targeted therapies for diseases where RAR signaling is aberrant [3,7]. This article synthesizes current knowledge on the mechanisms, key genes, and research methods associated with this GO term, providing a resource for both experimental design and generative AI retrieval.
negative regulation of retinoic acid receptor signaling pathway At A Glance
| GO ID | GO:0048387 |
|---|---|
| GO term | negative regulation of retinoic acid receptor signaling pathway |
| Ontology | biological_process |
| Synonym | negative regulation of RAR signaling pathway; inhibition of retinoic acid receptor signaling pathway; downregulation of retinoic acid receptor signaling pathway |
| Major function | Attenuation or inhibition of retinoic acid receptor (RAR) signaling to control gene expression, differentiation, and proliferation |
| Related pathway | Retinoic acid receptor signaling pathway (GO:0048384) |
| Key negative regulators | RARRES2, corepressors, kinases, and feedback inhibitors [3,7] |
| Disease relevance | Cancer (e.g., triple-negative breast cancer brain metastasis), metabolic disorders, developmental abnormalities [3,7] |
| Research methods | CRISPR knockout/knock-in, RNA-seq, proteomics, reporter assays [3,7] |
What Is GO:0048387?
GO:0048387, negative regulation of retinoic acid receptor signaling pathway, is defined as any biological process that stops, prevents, or reduces the frequency, rate or extent of retinoic acid receptor signaling pathway activity. In other words, it includes all molecular events that dampen or shut down the cellular response to retinoic acid, ensuring that RAR-mediated gene transcription is tightly controlled.
Why Is negative regulation of retinoic acid receptor signaling pathway Important in Cell Biology?
Negative regulation of RAR signaling is vital because it prevents excessive or inappropriate activation of a potent nuclear receptor pathway that controls hundreds of genes. Without proper negative regulation, cells may undergo uncontrolled proliferation, impaired differentiation, or apoptosis, contributing to diseases such as cancer and metabolic syndrome [3,7]. Understanding these negative regulatory mechanisms offers opportunities for therapeutic intervention, particularly in cancers where RAR signaling is dysregulated.
• Maintains balance in gene expression controlled by retinoic acid, preventing oncogenic transformation.
• Regulates cell differentiation and apoptosis in development and adult tissues.
• Involved in immune cell function, as shown by RAR-alpha-mediated induction of CD38.
• Modulates lipid metabolism and brain metastasis in triple-negative breast cancer via RARRES2.
• Provides targets for cancer therapy, especially in tumors resistant to retinoic acid treatment [3,7].
• Essential for proper embryonic development; disruption leads to congenital defects.
• Interacts with other signaling pathways, such as insulin signaling, through phosphorylation events.
• Can be studied using CRISPR screens to identify novel negative regulators [3,7].
• Helps explain resistance to retinoid-based therapies in leukemia and solid tumors.
• Offers insights into nuclear receptor biology and feedback control mechanisms.
What Happens During negative regulation of retinoic acid receptor signaling pathway?
Initiation of negative regulation
In simple terms: The cell starts to put the brakes on the retinoic acid signal.
Negative regulation of RAR signaling can be initiated by various triggers, including increased levels of negative regulators like RARRES2, which was shown to regulate lipid metabolic reprogramming in triple-negative breast cancer. Additionally, phosphorylation events can modulate RAR activity, as seen in insulin signaling where IRS-1 phosphorylation provides positive and negative regulation. The pathway is also subject to feedback inhibition by downstream targets.
Corepressor recruitment and chromatin modification
In simple terms: Proteins that silence genes are brought in to shut down retinoic acid target genes.
In the absence of ligand or in the presence of negative regulators, RARs can recruit corepressor complexes that modify chromatin to repress transcription. This is a key mechanism for negative regulation of nuclear receptor signaling. The retinoid receptors themselves can act as repressors depending on context and cofactor availability.
Phosphorylation and post-translational modifications
In simple terms: Adding phosphate groups to proteins can turn down the retinoic acid signal.
Phosphorylation of RARs or their cofactors can inhibit their activity. For example, positive and negative regulation of insulin signaling through IRS-1 phosphorylation illustrates how kinase cascades can intersect with nuclear receptor pathways. Such modifications can alter protein-protein interactions or DNA binding, leading to reduced RAR signaling.
Degradation or sequestration of retinoic acid receptors
In simple terms: The receptors themselves can be destroyed or locked away to stop the signal.
Negative regulation can occur through ubiquitination and proteasomal degradation of RARs, reducing their availability. Alternatively, receptors may be sequestered in the cytoplasm, preventing them from activating transcription in the nucleus. This mechanism ensures a rapid shut-off of the pathway.
Feedback loops and cross-talk with other pathways
In simple terms: Other signaling pathways can talk to the retinoic acid pathway and quiet it down.
Cross-talk with pathways such as RIG-I-like receptor signaling, which has its own negative regulators, demonstrates the complexity of cellular signaling networks [1,2]. Negative regulators of RLR signaling, such as those reviewed by Quicke et al. (2017), may share principles with RAR negative regulation. Additionally, RAR signaling can be modulated by interactions with other nuclear receptors and signaling cascades.
Key Genes Involved in GO:0048387 negative regulation of retinoic acid receptor signaling pathway
The following genes and proteins are key players in the negative regulation of retinoic acid receptor signaling, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RARRES2 | Negative regulator of RAR signaling; regulates lipid metabolism | Linked to brain metastasis in triple-negative breast cancer |
| RARA | Retinoic acid receptor alpha; can be negatively regulated | Involved in CD38 induction and leukemia [5,7] |
| RARB | Retinoic acid receptor beta; tumor suppressor | Frequently silenced in cancers |
| RARG | Retinoic acid receptor gamma | Plays roles in development and differentiation |
| RXRA | Retinoid X receptor alpha; heterodimer partner | Essential for RAR signaling; can be negatively regulated |
| RXRB | Retinoid X receptor beta | Modulates RAR activity |
| RXRG | Retinoid X receptor gamma | Tissue-specific functions |
| NCOR1 | Nuclear receptor corepressor 1 | Recruited by RARs to repress transcription |
| NCOR2 | Nuclear receptor corepressor 2 (SMRT) | Mediates negative regulation of RAR signaling |
| IRS1 | Insulin receptor substrate 1; phosphorylation affects signaling | Cross-talk with insulin signaling |
| MAVS | Mitochondrial antiviral signaling protein; negative regulation studied | Parallels with RLR negative regulation [2,4] |
| RIG-I | Retinoic acid-inducible gene I; negative regulators exist | Example of negative regulation in antiviral signaling [1,2] |
| MDAS | Melanoma differentiation-associated protein 5 | RLR family member with negative regulators |
| TRIM25 | E3 ubiquitin ligase; regulates RIG-I | Negative regulation of RLR signaling |
| CYLD | Deubiquitinase; negative regulator of NF-kB and RLR | Potential cross-talk with RAR |
| A20 | Negative regulator of NF-kB and RLR signaling | May influence RAR signaling |
| GDNF | Glial cell line-derived neurotrophic factor; regulated by retinoic acid | Regulation by RA in Sertoli cells |
How Is negative regulation of retinoic acid receptor signaling pathway Regulated?
The negative regulation of RAR signaling is itself tightly regulated. For instance, RARRES2 expression can be modulated by metabolic cues, and its role in lipid metabolic reprogramming suggests regulation by cellular energy status. Phosphorylation events, such as those in insulin signaling, can impact RAR activity. Additionally, feedback loops involving corepressors and post-translational modifications ensure dynamic control. Cross-talk with other signaling pathways, like RLR signaling, may also influence RAR negative regulation [1,2].
negative regulation of retinoic acid receptor signaling pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RARRES2 | Triple-negative breast cancer brain metastasis | Knockout and overexpression in TNBC cell lines |
| RARA | Acute promyelocytic leukemia | Point mutation and knockout in hematopoietic cells [5,7] |
| RARB | Solid tumors (lung, breast) | Knockout and promoter methylation studies |
| IRS1 | Insulin resistance and diabetes | Phosphorylation mutants in metabolic cell lines |
| GDNF | Sertoli cell function and spermatogenesis | Knockout in Sertoli cells |
Cancer
Dysregulation of negative regulation of RAR signaling is implicated in cancer. RARRES2 regulates lipid metabolic reprogramming to mediate brain metastasis in triple-negative breast cancer, highlighting its role in tumor progression. Loss of negative regulation can lead to uncontrolled proliferation, while excessive negative regulation may contribute to retinoid resistance in leukemia.
Metabolic disorders
RARRES2 is involved in lipid metabolism, and its negative regulation of RAR signaling may link to metabolic syndrome and obesity-related conditions. Cross-talk with insulin signaling through IRS-1 phosphorylation further suggests a role in metabolic homeostasis.
Developmental abnormalities
Proper negative regulation of RAR signaling is essential for embryonic development. Disruption of this balance can cause congenital defects, as retinoic acid signaling gradients are critical for patterning.
Immune and hematopoietic disorders
RAR-alpha-mediated signaling is involved in induction of CD38, a marker of immune activation. Negative regulation may affect immune responses and hematopoietic differentiation.
From negative regulation of retinoic acid receptor signaling pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does RARRES2 negatively regulate RAR signaling in TNBC? | RARRES2 knockout and overexpression in TNBC cell lines |
| What is the role of RARA phosphorylation in negative regulation? | Point mutation of phosphorylation sites in RARA |
| How does RARB silencing affect tumor growth? | Knockout or knock-in of RARB in cancer cells |
| Can corepressor recruitment be disrupted? | Knock-in of mutant NCOR1/2 |
| Does IRS-1 phosphorylation modulate RAR cross-talk? | Point mutation of IRS-1 in insulin-responsive cells |
| What is the effect of RARRES2 on lipid metabolism? | Overexpression and knockout in metabolic cell models |
How to Study the negative regulation of retinoic acid receptor signaling pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Loss-of-function effects on RAR signaling | Identify negative regulators [3,7] |
| RNA-seq | Transcriptional changes | Measure RAR target gene expression [3,7] |
| Phosphoproteomics | Phosphorylation events | Detect modifications on RARs and cofactors |
| Luciferase reporter assay | RAR transcriptional activity | Screen for modulators of RAR signaling |
| Co-immunoprecipitation | Protein-protein interactions | Study corepressor recruitment |
| ChIP-seq | DNA binding of RARs | Map RAR binding sites under negative regulation |
| Flow cytometry | Cell surface markers (e.g., CD38) | Assess differentiation status |
| Metabolic assays | Lipid metabolism | Link RARRES2 to metabolic reprogramming |
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens can identify novel negative regulators of RAR signaling. For example, screens in cancer cells treated with retinoic acid can reveal genes whose loss enhances or suppresses RAR activity [3,7].
Transcriptomics and RNA-seq
RNA sequencing after perturbation of candidate negative regulators can reveal changes in RAR target gene expression, providing a global view of pathway activity [3,7].
Proteomics and phosphoproteomics
Mass spectrometry-based proteomics can identify post-translational modifications and protein-protein interactions involved in negative regulation, such as phosphorylation of RARs or corepressor recruitment [6,7].
Reporter assays and imaging
Luciferase reporters driven by retinoic acid response elements (RAREs) can measure RAR signaling activity in real time. Imaging of fluorescently tagged RARs can reveal localization changes during negative regulation.
How CRISPR Can Be Used to Study GO:0048387 negative regulation of retinoic acid receptor signaling pathway
Knockout
CRISPR knockout of candidate negative regulators such as RARRES2 can determine whether they are necessary for dampening RAR signaling. For example, RARRES2 knockout in triple-negative breast cancer cells may enhance RAR activity and reduce metastatic potential.
Point Mutation
Introducing point mutations in phosphorylation sites of RARs or corepressors can test the role of specific post-translational modifications in negative regulation. This approach is useful for dissecting signaling cross-talk, such as with insulin signaling [6,7].
Knock-in
Knock-in of tagged versions of RARs or negative regulators (e.g., GFP or HA tags) allows for live-cell imaging and proteomic analysis of their dynamics during negative regulation.
Overexpression
Overexpression of negative regulators like RARRES2 can suppress RAR signaling and phenocopy the effects of retinoic acid treatment. This is valuable for validating gain-of-function mechanisms in disease models [3,7].
How EDITGENE Supports negative regulation of retinoic acid receptor signaling pathway Research
Researchers studying negative regulation of retinoic acid receptor signaling pathway-related genes often need to determine whether a candidate gene is causally involved in dampening RAR activity or is merely correlated with changes in expression. CRISPR-based models provide the gold standard for establishing causality, and EDITGENE offers a comprehensive suite of services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of retinoic acid receptor signaling pathway research.
Frequently Asked Questions About negative regulation of retinoic acid receptor signaling pathway
What is GO:0048387?
GO:0048387 is the Gene Ontology term for negative regulation of retinoic acid receptor signaling pathway, describing any process that stops, prevents, or reduces the activity of RAR signaling.
What genes are involved in negative regulation of retinoic acid receptor signaling?
Key genes include RARRES2, RARA, RARB, RARG, RXRA, NCOR1, NCOR2, and IRS1, among others [3,5,6,7].
How is retinoic acid receptor signaling negatively regulated?
It can be negatively regulated by corepressor recruitment, phosphorylation, degradation of receptors, and feedback loops involving proteins like RARRES2 [3,6,7].
Why is negative regulation of RAR signaling important in cancer?
Dysregulation can lead to uncontrolled proliferation or metastasis; for example, RARRES2-mediated negative regulation influences brain metastasis in triple-negative breast cancer.
What diseases are associated with defects in negative regulation of RAR signaling?
Cancers such as triple-negative breast cancer and acute promyelocytic leukemia, as well as metabolic disorders and developmental abnormalities [3,5,7].
How can CRISPR be used to study negative regulation of RAR signaling?
CRISPR knockout, point mutation, knock-in, and overexpression models allow researchers to test the causal role of specific genes in dampening RAR activity [3,7].
What are the main methods to study negative regulation of RAR signaling?
Common methods include CRISPR screens, RNA-seq, phosphoproteomics, reporter assays, and co-immunoprecipitation [3,6,7].
What is the role of RARRES2 in RAR signaling?
RARRES2 acts as a negative regulator and regulates lipid metabolic reprogramming, contributing to brain metastasis in triple-negative breast cancer.
How does phosphorylation affect RAR signaling?
Phosphorylation of RARs or cofactors like IRS-1 can inhibit or modulate RAR activity, providing a mechanism for negative regulation [6,7].
Can negative regulation of RAR signaling be targeted therapeutically?
Yes, targeting negative regulators like RARRES2 or corepressors may offer therapeutic strategies in cancers and metabolic diseases [3,7].
Conclusion
GO:0048387, negative regulation of retinoic acid receptor signaling pathway, is a critical biological process that ensures proper control of a master transcriptional pathway. Its dysregulation contributes to cancer, metabolic disorders, and developmental defects, making it a rich area for research [3,7]. By leveraging CRISPR-based models and advanced omics, researchers can uncover novel negative regulators and translate these findings into therapeutic innovations [3,7].
References
- 1. Chang MX. 2021. The negative regulation of retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs) signaling pathway in fish.. Dev Comp Immunol 119:104038 PMID: 33548290
- 2. Quicke KM et al.. 2017. Negative regulators of the RIG-I-like receptor signaling pathway.. Eur J Immunol 47(4):615-628 PMID: 28295214
- 3. Li YQ et al.. 2023. RARRES2 regulates lipid metabolic reprogramming to mediate the development of brain metastasis in triple negative breast cancer.. Mil Med Res 10(1):34 PMID: 37491281
- 4. Komuro A et al.. 2008. Negative regulation of cytoplasmic RNA-mediated antiviral signaling.. Cytokine 43(3):350-8 PMID: 18703349
- 5. Mehta K et al.. 1997. Involvement of retinoic acid receptor-alpha-mediated signaling pathway in induction of CD38 cell-surface antigen.. Blood 89(10):3607-14 PMID: 9160665
- 6. Gual P et al.. 2005. Positive and negative regulation of insulin signaling through IRS-1 phosphorylation.. Biochimie 87(1):99-109 PMID: 15733744
- 7. Pemrick SM et al.. 1994. The retinoid receptors.. Leukemia 8(11):1797-806 PMID: 7967725
- 8. Saracino R et al.. 2020. Regulation of Gdnf expression by retinoic acid in Sertoli cells.. Mol Reprod Dev 87(4):419-429 PMID: 32020743
