GO:0140610 RNA sequestering activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140610 RNA sequestering activity is a molecular function defined as binding to a specific RNA molecule to prevent it from interacting with other partners or to inhibit its localization to the area of the cell or complex where it is active.
• RNA sequestering activity is a key regulatory mechanism in membraneless organelles, where RNAs are concentrated and stored or shielded from the translational machinery.
• Circular RNAs (circRNAs) are prominent sequestering agents that can sponge microRNAs and proteins, thereby modulating gene expression and cellular signaling.
• N6-methyladenosine (m6A) modification marks endogenous circRNAs as 'self', preventing their recognition by innate immune sensors; loss of this modification leads to circRNA immunogenicity.
• Sequestration of proteins by RNA, such as FOXO1 by circHERC1, can promote cancer progression by altering subcellular localization and signaling.
• Dysregulated RNA sequestering activity is implicated in cancer, immune escape, and developmental disorders, making it a target for therapeutic intervention.
Description
RNA sequestering activity (GO:0140610) is a molecular function that involves the binding of a specific RNA molecule to prevent it from interacting with its normal partners or to restrict its localization to the appropriate cellular compartment. This activity is fundamental to post-transcriptional gene regulation, allowing cells to buffer RNA levels, store transcripts, or shield them from degradation and translation. Unlike RNA degradation or modification, sequestration is a reversible and dynamic process often mediated by RNA-binding proteins and non-coding RNAs within membraneless organelles. The importance of RNA sequestering activity extends to diverse biological processes, including stress responses, cell cycle control, and immune surveillance [2,3]. For researchers, understanding this function is critical because its dysregulation is linked to cancer, neurological disorders, and immune diseases [6,7]. Moreover, the growing recognition of circular RNAs as major sequestering molecules has opened new avenues for therapeutic targeting.
RNA sequestering activity At A Glance
| GO ID | GO:0140610 |
|---|---|
| GO term | RNA sequestering activity |
| Ontology | molecular_function |
| Synonym | None |
| Major function | Binding to a specific RNA molecule to prevent it from interacting with other partners or to inhibit its localization to the area of the cell or complex where it is active. |
| Related cellular component | Membraneless organelles (e.g., stress granules, P-bodies) |
| Key RNA types | Circular RNAs, long non-coding RNAs, messenger RNAs |
| Regulatory modifications | N6-methyladenosine (m6A) modification of RNA |
| Disease relevance | Cancer progression, immune escape, and developmental disorders [6,7] |
What Is GO:0140610?
According to the Gene Ontology, RNA sequestering activity (GO:0140610) is defined as binding to a specific RNA molecule to prevent it from interacting with other partners or to inhibit its localization to the area of the cell or complex where it is active. In other words, it is a molecular function where a protein or another RNA binds a target RNA and physically blocks its access to functional sites, such as ribosomes or processing enzymes, or confines it to a particular subcellular region. This activity does not necessarily involve catalysis; it is a stoichiometric, binding-driven mechanism that can be reversible and regulated by cellular signals.
Why Is RNA sequestering activity Important in Cell Biology?
RNA sequestering activity is a central mechanism for controlling gene expression at the post-transcriptional level. By binding and hiding specific RNAs, cells can rapidly adjust protein production without altering transcription, which is vital for responding to stress, maintaining stemness, and executing developmental programs. This function also plays a critical role in innate immunity by distinguishing self from non-self RNA; for example, m6A modification prevents endogenous circular RNAs from triggering immune responses. In disease, aberrant sequestration can lead to oncogene activation or tumor immune evasion, as seen with circHERC1 and circATXN7 [6,7]. Therefore, studying RNA sequestering activity provides insights into fundamental cell biology and offers potential targets for therapeutic intervention.
• Regulates gene expression post-transcriptionally by controlling RNA availability.
• Facilitates the formation and function of membraneless organelles such as stress granules and P-bodies.
• Circular RNAs act as sequestering agents for microRNAs and proteins, influencing signaling pathways.
• m6A modification of circRNAs prevents their recognition by innate immune sensors, highlighting a role in immune tolerance.
• Sequestration of FOXO1 by circHERC1 promotes non-small cell lung cancer progression.
• Mutant KRAS-induced circATXN7 sequesters factors to foster tumor immunoescape.
• TTC5 sequestration by soluble tubulins regulates tubulin mRNA decay, linking sequestration to cytoskeletal dynamics.
• Dysregulation of RNA sequestration is implicated in cancer, neurodegeneration, and ribosomopathies [6,7].
• Understanding RNA sequestering activity can inform the design of RNA-based therapeutics and CRISPR screens.
• Experimental models such as knockout and knock-in cells are essential to dissect the causal roles of sequestering factors.
What Happens During RNA sequestering activity?
Recognition and Binding of Target RNA
In simple terms: A protein or RNA molecule finds and attaches to a specific RNA target.
The first step in RNA sequestering activity is the specific recognition of a target RNA by a sequestering agent, which can be a protein or another RNA. This binding is often mediated by RNA-binding domains such as RNA recognition motifs (RRMs), zinc fingers, or complementary base pairing in the case of microRNA sponges. For instance, circular RNAs can contain multiple binding sites for microRNAs, allowing them to act as sponges. The specificity of this interaction ensures that only particular RNAs are sequestered, preventing unwanted interference with other transcripts. This step is reversible and can be regulated by post-translational modifications of the binding protein or by RNA modifications such as m6A.
Sequestration within Membraneless Organelles
In simple terms: The bound RNA is pulled into tiny cellular droplets where it is stored or hidden.
Once bound, the RNA-sequestering agent complex often localizes to membraneless organelles such as stress granules, processing bodies (P-bodies), or neuronal granules. These organelles concentrate specific RNAs and proteins, effectively isolating them from the translational machinery. For example, during stress, mRNAs are sequestered in stress granules to halt translation until conditions improve. The formation of these organelles is driven by liquid-liquid phase separation, and the sequestering activity directly contributes to their composition and dynamics. This spatial confinement prevents the RNA from interacting with ribosomes or other partners, thereby inhibiting its function.
Inhibition of RNA Function
In simple terms: The sequestered RNA cannot do its normal job, like making protein or being processed.
The ultimate outcome of RNA sequestering activity is the functional inhibition of the target RNA. This can occur through several mechanisms: blocking access to ribosomes for translation, preventing splicing or polyadenylation, or shielding the RNA from degradation enzymes. For instance, sequestration of FOXO1 mRNA by circHERC1 in the cytoplasm prevents FOXO1 from exerting its tumor-suppressive functions, thereby promoting cancer progression. Similarly, the sequestration of TTC5 by soluble tubulins regulates tubulin mRNA decay, illustrating how sequestration can control RNA stability. The inhibition is often reversible, allowing the RNA to be released and resume function when needed.
Release and Reversibility
In simple terms: The RNA can be let go to work again when the cell needs it.
RNA sequestering activity is not a permanent state; it is highly dynamic and reversible. Cellular signals, such as changes in phosphorylation or metabolite levels, can trigger the release of sequestered RNAs from the binding partner or from membraneless organelles. For example, stress granule disassembly upon stress recovery releases mRNAs back into the cytoplasm for translation. This reversibility allows cells to rapidly adapt to changing conditions without synthesizing new RNA. The regulation of release is critical for processes like synaptic plasticity and cell cycle progression, where timely translation of sequestered mRNAs is essential.
Key Genes Involved in GO:0140610 RNA sequestering activity
The following genes and their encoded proteins or RNAs are key players in RNA sequestering activity, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| circHERC1 | Sequesters FOXO1 in the cytoplasm, regulating miR-142-3p-HMGB1 axis | Promotes non-small cell lung cancer progression; potential therapeutic target |
| circATXN7 | Sequesters factors to sensitize tumor-specific T cells to activation-induced cell death | Fosters tumor immunoescape in mutant KRAS-driven cancers |
| TTC5 | Sequesters tubulin mRNA decay machinery; itself sequestered by soluble tubulins | Regulates tubulin mRNA stability and cytoskeletal dynamics |
| FOXO1 | Transcription factor sequestered by circHERC1 | Tumor suppressor; its sequestration promotes cancer |
| HMGB1 | Regulated by miR-142-3p-HMGB1 axis downstream of circHERC1 | Involved in cancer progression and inflammation |
| miR-142-3p | MicroRNA that can be sponged by circHERC1 | Modulates HMGB1 expression |
| m6A-modified circRNAs | Marked as self to avoid immune recognition | Prevents autoimmune responses; loss leads to immunogenicity |
| Various circRNAs | Act as microRNA sponges and protein sequestering agents | Regulate gene expression in development and disease |
| RNA-binding proteins | Bind specific RNAs to sequester them in granules | Key effectors of post-transcriptional regulation |
| Stress granule components | Concentrate sequestered RNAs during stress | Protect cells from stress-induced damage |
| P-body components | Sequesters RNAs for degradation or storage | Control mRNA turnover |
| Tubulin | Soluble αβ-tubulins sequester TTC5 | Regulates tubulin mRNA decay feedback loop |
| KRAS | Mutant KRAS activates circATXN7 | Oncogenic signaling and immune evasion |
| FOXO1 mRNA | Target of sequestration by circHERC1 | Loss of function contributes to cancer |
| HMGB1 mRNA | Indirect target via miR-142-3p sequestration | Promotes tumor progression |
| TTC5 mRNA | Target of sequestration by soluble tubulins | Regulates its own decay |
| circRNAs with m6A | Modified to avoid immune detection | Therapeutic potential for RNA-based drugs |
How Is RNA sequestering activity Regulated?
RNA sequestering activity is regulated at multiple levels. The abundance and availability of sequestering agents, such as circular RNAs and RNA-binding proteins, are controlled by transcription and degradation. Post-translational modifications, including phosphorylation, can alter the affinity of proteins for their target RNAs or their ability to phase separate into membraneless organelles. Additionally, RNA modifications like N6-methyladenosine (m6A) can mark RNAs for sequestration or prevent it; for instance, m6A modification of circRNAs prevents their recognition by immune sensors, effectively regulating their sequestering activity. Cellular stress pathways, such as the integrated stress response, can promote the assembly of stress granules that sequester mRNAs, thereby globally inhibiting translation. The mTOR pathway also influences the formation of membraneless organelles and the release of sequestered RNAs in response to nutrient availability. These regulatory layers ensure that RNA sequestration is dynamic and context-dependent.
RNA sequestering activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| circHERC1 | Non-small cell lung cancer progression | Knockout of circHERC1 in lung cancer cell lines; overexpression in normal cells |
| circATXN7 | Tumor immunoescape in KRAS-mutant cancers | Knockout in KRAS-mutant tumor cells; co-culture with T cells |
| m6A-modified circRNAs | Autoimmune responses due to loss of self-marking | Knockout of m6A writer enzymes (e.g., METTL3) in cells; immunogenicity assays |
| TTC5 | Tubulin mRNA decay dysregulation | Point mutations in TTC5 to disrupt tubulin binding; knock-in of tagged TTC5 |
| FOXO1 | Cancer (loss of tumor suppression) | Overexpression of FOXO1 mutant resistant to sequestration; knockout of FOXO1 |
RNA Sequestration in Cancer
Dysregulated RNA sequestering activity is increasingly recognized as a driver of cancer progression. For example, the circular RNA circHERC1 sequesters FOXO1 in the cytoplasm, preventing FOXO1 from acting as a tumor suppressor and thereby promoting non-small cell lung cancer cell progression. Another circular RNA, circATXN7, is activated by mutant KRAS and fosters tumor immunoescape by sensitizing tumor-specific T cells to activation-induced cell death. These examples highlight how sequestration can alter key signaling pathways and immune interactions, making it a potential target for cancer therapy. Targeting the sequestering interaction or restoring the function of the sequestered RNA could offer new therapeutic strategies.
RNA Sequestration and Immune Regulation
RNA sequestering activity plays a critical role in innate immunity by distinguishing self from non-self RNA. N6-methyladenosine (m6A) modification of endogenous circular RNAs marks them as 'self', preventing their recognition by immune sensors such as RIG-I. Loss of m6A modification leads to circRNA immunogenicity and autoimmune responses. This regulatory mechanism is essential for immune tolerance and highlights how sequestration can prevent inappropriate immune activation. Dysregulation of this process may contribute to autoimmune diseases, making it a target for modulating immune responses.
RNA Sequestration in Neurodegeneration and Developmental Disorders
Membraneless organelles, where RNA sequestration occurs, are implicated in neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS) and frontotemporal dementia, where stress granule dynamics are altered. Sequestration of specific mRNAs in neuronal granules is crucial for synaptic plasticity, and its disruption may contribute to neurological disorders. Additionally, mutations in genes encoding RNA-binding proteins that mediate sequestration can cause developmental disorders, although specific examples are still emerging. Understanding the role of RNA sequestering activity in these contexts could reveal new therapeutic targets.
From RNA sequestering activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate sequestering RNA affect target RNA localization? | Knockout of the circular RNA or RNA-binding protein using CRISPR-Cas9 |
| Does a specific point mutation in the RNA-binding domain abolish sequestration? | Point mutation knock-in via CRISPR base editing or HDR |
| Can a tagged version of the sequestering protein be used to pull down target RNAs? | Knock-in of an epitope tag (e.g., FLAG, HA) at the endogenous locus |
| Does overexpression of a sequestering RNA phenocopy cancer progression? | Overexpression of circHERC1 or circATXN7 in cell lines and mouse models [6,7] |
| What is the global impact of sequestration on translation? | Ribo-seq and RNA-seq in knockout vs. wild-type cells |
| Can small molecules disrupt sequestration? | High-throughput screening with reporter assays in cells expressing the sequestering RNA |
How to Study the RNA sequestering activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Global translation efficiency and ribosome occupancy | Identify mRNAs released from sequestration upon knockout |
| RNA-seq | Transcript abundance and splicing | Quantify changes in RNA levels after sequestration disruption |
| RIP-seq | RNAs bound by a specific protein | Map target RNAs of a sequestering protein |
| CLIP-seq | Precise RNA binding sites of a protein | Define sequence motifs and binding specificity |
| Fluorescence microscopy | Subcellular localization and co-localization | Visualize sequestration in membraneless organelles |
| Live-cell imaging | Dynamic movement of RNA and proteins | Track release of sequestered RNAs over time |
| Proteomics (LC-MS/MS) | Protein interaction partners | Identify components of the sequestration complex |
| RNA FISH | Localization of specific RNAs | Detect sequestered RNAs in cells and tissues |
Ribo-seq and RNA-seq for Global Translation and Transcriptome Analysis
Ribosome profiling (Ribo-seq) allows researchers to measure translation efficiency globally and identify mRNAs that are sequestered from ribosomes. By comparing knockout cells lacking a sequestering factor to wild-type cells, one can determine which transcripts are released for translation upon loss of sequestration. RNA-seq complements this by quantifying transcript levels and detecting changes in RNA stability or splicing. These methods are powerful for uncovering the downstream effects of RNA sequestering activity on gene expression programs.
RNA Immunoprecipitation (RIP) and Crosslinking and Immunoprecipitation (CLIP)
To identify the specific RNAs bound by a sequestering protein, RNA immunoprecipitation (RIP) followed by sequencing can be used. For higher resolution, CLIP (crosslinking and immunoprecipitation) covalently links RNA-protein complexes before immunoprecipitation, allowing precise mapping of binding sites. These techniques are essential for defining the target RNA repertoire of a sequestering agent and understanding its specificity. They can be combined with knockout or knockdown of the sequestering factor to validate interactions.
Fluorescence Microscopy and Live-Cell Imaging
Fluorescence microscopy, including live-cell imaging, enables visualization of RNA sequestration in membraneless organelles. By tagging the sequestering protein with a fluorescent protein and using RNA FISH (fluorescence in situ hybridization) to detect target RNAs, researchers can observe co-localization and dynamics. Advanced techniques such as single-molecule imaging can reveal real-time binding and release events. These methods are crucial for understanding the spatial and temporal regulation of RNA sequestering activity.
Proteomics and Interactome Analysis
Mass spectrometry-based proteomics can identify proteins that interact with sequestering RNAs or proteins. For example, pull-down of a tagged sequestering protein followed by LC-MS/MS reveals its interaction partners, including other RNA-binding proteins and structural components of membraneless organelles. This approach helps build a comprehensive map of the sequestration complex and its regulation. It can also uncover post-translational modifications that modulate sequestering activity.
How CRISPR Can Be Used to Study GO:0140610 RNA sequestering activity
Knockout
CRISPR-Cas9 knockout is a powerful approach to study RNA sequestering activity by eliminating the sequestering agent, such as a circular RNA or an RNA-binding protein. For example, knocking out circHERC1 in lung cancer cells can reveal its role in sequestering FOXO1 and promoting cancer progression. Knockout of m6A writer enzymes like METTL3 can abolish m6A modification on circRNAs, leading to immune activation and demonstrating the importance of sequestration in immune tolerance. Knockout models are essential for establishing causality and identifying downstream effects.
Point Mutation
Point mutations can be introduced via CRISPR base editing or homology-directed repair (HDR) to disrupt specific RNA-binding domains or modification sites. For instance, mutating the m6A consensus motif in a circRNA can prevent its methylation and test the role of m6A in preventing immune recognition. Similarly, point mutations in TTC5 that disrupt its binding to tubulins can clarify how sequestration regulates tubulin mRNA decay. These models allow fine-tuning of sequestering activity without completely abolishing the protein or RNA.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) or fluorescent proteins at endogenous loci enables visualization and pull-down of sequestering agents. For example, knocking in a FLAG tag on a circular RNA is challenging, but tagging the protein that binds it can facilitate RIP-seq. Knock-in of reporter genes under the control of sequestered RNA elements can also be used to monitor sequestration in real time. These models are valuable for studying the dynamics and interactions of RNA sequestering activity in a physiological context.
Overexpression
Overexpression of a sequestering RNA or protein can phenocopy disease states and test sufficiency. For example, overexpressing circHERC1 in non-cancerous cells can drive malignant transformation by sequestering FOXO1. Overexpression of circATXN7 in KRAS-mutant tumors enhances immunoescape. These models are useful for identifying downstream effects and for screening drugs that disrupt sequestration. However, overexpression artifacts must be carefully controlled, and results should be validated with endogenous knock-in or knockout models.
How EDITGENE Supports RNA sequestering activity Research
Researchers studying RNA sequestering activity-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. This requires precise genetic manipulation to knock out, mutate, tag, or overexpress the gene of interest in relevant cell models. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate such investigations, ensuring that experiments are reproducible and publication-ready.
Contact EDITGENE today to design your custom CRISPR model for RNA sequestering activity research.
Frequently Asked Questions About RNA sequestering activity
What is RNA sequestering activity?
RNA sequestering activity (GO:0140610) is a molecular function where a molecule binds to a specific RNA to prevent it from interacting with other partners or to inhibit its localization to the area of the cell or complex where it is active.
What genes are involved in RNA sequestering activity?
Key genes include circHERC1, circATXN7, TTC5, FOXO1, and various circular RNAs and RNA-binding proteins that mediate sequestration [6,7,8].
How does RNA sequestering activity regulate gene expression?
It controls gene expression post-transcriptionally by hiding RNAs from ribosomes or processing enzymes, thereby inhibiting translation or altering RNA stability.
What is the role of circular RNAs in RNA sequestering activity?
Circular RNAs can act as sponges for microRNAs and proteins, sequestering them and modulating signaling pathways involved in cancer and development.
How is RNA sequestering activity linked to cancer?
Dysregulated sequestration, such as circHERC1 sequestering FOXO1, promotes cancer progression and immune escape, making it a therapeutic target [6,7].
What experimental methods are used to study RNA sequestering activity?
Common methods include Ribo-seq, RNA-seq, RIP-seq, CLIP-seq, fluorescence microscopy, and proteomics to identify sequestered RNAs and their functions.
Can CRISPR be used to study RNA sequestering activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of sequestering agents to test causality [6,8].
What diseases are associated with RNA sequestering activity?
Cancer, autoimmune responses due to loss of self-marking on circRNAs, and neurodegenerative disorders linked to membraneless organelle dysfunction [3,6,7].
How does m6A modification affect RNA sequestering activity?
m6A modification marks circRNAs as self, preventing immune recognition; loss of m6A leads to immunogenicity and autoimmune responses.
What services does EDITGENE offer for RNA sequestering activity research?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics services to study RNA sequestering activity.
Conclusion
RNA sequestering activity (GO:0140610) is a fundamental molecular function that regulates RNA fate by binding and hiding specific transcripts from their functional partners. It operates within membraneless organelles and is mediated by diverse agents including circular RNAs and RNA-binding proteins. Its dysregulation contributes to cancer, immune disorders, and neurodegeneration, underscoring its importance in human health. Advances in CRISPR-based models and high-throughput sequencing are rapidly expanding our understanding of this process, offering new opportunities for therapeutic intervention. EDITGENE stands ready to support researchers with tailored CRISPR solutions to dissect the mechanisms and disease relevance of RNA sequestering activity.
References
- 1. Hirose T et al.. 2023. A guide to membraneless organelles and their various roles in gene regulation.. Nat Rev Mol Cell Biol 24(4):288-304 PMID: 36424481
- 2. Chen LL. 2020. The expanding regulatory mechanisms and cellular functions of circular RNAs.. Nat Rev Mol Cell Biol 21(8):475-490 PMID: 32366901
- 3. Chen YG et al.. 2019. N6-Methyladenosine Modification Controls Circular RNA Immunity.. Mol Cell 76(1):96-109.e9 PMID: 31474572
- 5. Chen R et al.. 2024. Direct observation of translational activation by a ribonucleoprotein granule.. Nat Cell Biol 26(8):1322-1335 PMID: 38965420
- 6. Cui Y et al.. 2023. CircHERC1 promotes non-small cell lung cancer cell progression by sequestering FOXO1 in the cytoplasm and regulating the miR-142-3p-HMGB1 axis.. Mol Cancer 22(1):179 PMID: 37932766
- 7. Zhou C et al.. 2024. Mutant KRAS-activated circATXN7 fosters tumor immunoescape by sensitizing tumor-specific T cells to activation-induced cell death.. Nat Commun 15(1):499 PMID: 38216551
- 8. Batiuk A et al.. 2024. Soluble αβ-tubulins reversibly sequester TTC5 to regulate tubulin mRNA decay.. Nat Commun 15(1):9963 PMID: 39551769
