GO:0036464 cytoplasmic ribonucleoprotein granule: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0036464 defines a ribonucleoprotein granule located in the cytoplasm, also known as a Staufen granule, which concentrates RNA-binding proteins and RNAs into membraneless compartments.
• Cytoplasmic RNP granules form through liquid-liquid phase separation and are dynamically regulated by stress, osmotic changes, and proteotoxic signals.
• Key components include stress granule proteins such as G3BP1, TIA1, and DHX9, as well as RNA-modifying enzymes like QKI that shuttle m7G-modified transcripts into these granules.
• Dysregulation of cytoplasmic RNP granules is linked to cancer progression, T cell exhaustion, ovarian aging, and neurodegenerative conditions.
• CRISPR-based knockout, knock-in, and overexpression models are essential for dissecting the causal roles of granule components in disease.
• Advanced methods such as Ribo-seq, RNA-seq, proteomics, and live-cell imaging enable comprehensive characterization of granule composition and function.
Description
Cytoplasmic ribonucleoprotein granules (GO:0036464) are membraneless compartments in the cytoplasm that concentrate specific RNAs and RNA-binding proteins to regulate RNA metabolism, translation, and stress responses. These granules, also known as Staufen granules, are dynamic structures that assemble and disassemble in response to cellular cues, and their dysfunction is increasingly implicated in human diseases ranging from cancer to neurodegeneration. Understanding their composition, assembly, and regulation is critical for researchers studying post-transcriptional gene control and disease mechanisms.
cytoplasmic ribonucleoprotein granule At A Glance
| GO ID | GO:0036464 |
|---|---|
| GO term | cytoplasmic ribonucleoprotein granule |
| Ontology | cellular_component |
| Synonym | Staufen granule |
| Major function | Concentration and regulation of RNAs and RNA-binding proteins in the cytoplasm |
| Assembly mechanism | Liquid-liquid phase separation driven by multivalent interactions |
| Key regulators | Stress, osmotic stress, proteotoxic stress, and RNA modifications |
| Disease relevance | Cancer, neurodegeneration, ovarian aging, and immune evasion |
What Is GO:0036464?
According to the Gene Ontology, GO:0036464 describes a ribonucleoprotein granule located in the cytoplasm. This term encompasses membraneless, phase-separated compartments enriched in RNA-binding proteins and RNAs, such as stress granules, processing bodies (P-bodies), and Staufen granules, which collectively regulate RNA stability, translation, and localization.
Why Is cytoplasmic ribonucleoprotein granule Important in Cell Biology?
Cytoplasmic RNP granules are central to post-transcriptional gene regulation, enabling cells to rapidly adapt to stress by sequestering or translating specific mRNAs. Their dynamic assembly and disassembly influence cell survival, proliferation, and immune responses, and their dysregulation contributes to a wide range of pathologies, including cancer, neurodegeneration, and aging-related disorders. Therefore, studying these granules provides mechanistic insights into cellular stress responses and offers potential therapeutic targets.
• Regulate mRNA stability, translation, and localization in response to stress.
• Serve as hubs for RNA modifications, such as m7G, that influence mRNA fate.
• Modulate immune cell function and exhaustion in cancer.
• Contribute to ovarian aging through stress granule clearance mechanisms.
• Involved in hormetic adaptation of cancer cells to stress.
• Link to neurodegenerative diseases via aberrant phase transitions.
• Provide targets for CRISPR-based functional studies.
• Enable high-throughput screening for modulators of granule dynamics.
• Offer biomarkers for stress-related diseases.
• Facilitate development of therapeutics targeting RNA metabolism.
What Happens During cytoplasmic ribonucleoprotein granule?
Nucleation and Phase Separation
In simple terms: Granules form when certain proteins and RNAs clump together into droplets.
Cytoplasmic RNP granules assemble through liquid-liquid phase separation, driven by multivalent interactions among RNA-binding proteins and RNAs. This process is often triggered by stress, such as osmotic stress sensed by DCP5, which promotes granule formation. The nucleation step involves key scaffold proteins like G3BP1 and TIA1 that recruit additional components.
RNA Recruitment and Modification
In simple terms: Specific RNAs are brought into the granules, sometimes after chemical tags are added.
RNAs are selectively recruited to granules based on sequence elements and modifications. For example, QKI shuttles internal m7G-modified transcripts into stress granules, thereby modulating mRNA metabolism. Similarly, DHX9 stress granules compartmentalize damaged RNAs to prevent translation of aberrant proteins.
Stress-Induced Assembly and Disassembly
In simple terms: Granules appear under stress and disappear when stress is relieved.
Stress granules form rapidly upon stress exposure and disassemble after stress removal. The clearance of stress granules is mediated by factors such as NCOA7, which interacts with V-ATPase to promote granule degradation, and this process mitigates ovarian aging. Additionally, IRE1α dynamically coalesces with stress granules to regulate their function.
Functional Interactions with Cellular Pathways
In simple terms: Granules communicate with other cellular machines to control cell fate.
Cytoplasmic RNP granules interact with signaling pathways such as the integrated stress response and mTOR, influencing translation and cell survival. In cancer, stress granules contribute to hormetic adaptation, allowing tumor cells to tolerate adverse conditions. Proteotoxic stress drives T cell exhaustion and immune evasion, partly through stress granule-mediated mechanisms.
Key Genes Involved in GO:0036464 cytoplasmic ribonucleoprotein granule
The following genes encode key components and regulators of cytoplasmic ribonucleoprotein granules, as supported by recent literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| G3BP1 | Core scaffold protein for stress granule assembly | Knockout studies reveal essential role in granule formation |
| TIA1 | RNA-binding protein promoting granule nucleation | Modulates stress granule dynamics and translation |
| DHX9 | RNA helicase that compartmentalizes damaged RNA | Links RNA damage to stress granule formation |
| QKI | Shuttles m7G-modified transcripts into stress granules | Regulates mRNA metabolism and granule composition |
| NCOA7 | Mediates stress granule clearance via V-ATPase | Implicated in ovarian aging and proteostasis |
| IRE1α | ER stress sensor that coalesces with stress granules | Connects ER stress to granule function |
| DCP5 | Osmosensing protein that promotes granule assembly | Links osmotic stress to phase separation |
| V-ATPase | Proton pump involved in granule clearance | Interacts with NCOA7 for granule degradation |
| mTOR | Kinase regulating translation and granule dynamics | Modulates stress granule formation |
| eIF2α | Translation initiation factor phosphorylated under stress | Key regulator of stress granule assembly |
| PABP | Poly(A)-binding protein in granules | Affects mRNA stability and translation |
| RACK1 | Ribosome-associated protein in granules | Modulates translation in stress granules |
| FMR1 | RNA-binding protein linked to neurodegeneration | Mutations cause fragile X syndrome |
| TDP-43 | RNA-binding protein prone to aggregation | Associated with ALS and frontotemporal dementia |
| ATXN2 | RNA-binding protein involved in granule assembly | Linked to spinocerebellar ataxia and ALS |
| DDX3X | RNA helicase in stress granules | Regulates translation and granule dynamics |
| CAPRIN1 | Scaffold protein in stress granules | Modulates granule formation and mRNA stability |
| USP10 | Deubiquitinase regulating stress granule disassembly | Affects granule clearance and cell survival |
How Is cytoplasmic ribonucleoprotein granule Regulated?
Cytoplasmic RNP granule assembly and disassembly are tightly regulated by signaling pathways, including the integrated stress response (ISR) and mTOR. Phosphorylation of eIF2α by stress-activated kinases promotes granule formation, while mTOR inhibition enhances stress granule assembly. Additionally, RNA modifications such as m7G influence granule recruitment, and proteins like NCOA7 mediate clearance through V-ATPase interaction. Osmotic stress sensed by DCP5 also triggers granule formation.
cytoplasmic ribonucleoprotein granule and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| TDP-43 | ALS and frontotemporal dementia | Knock-in of mutant TDP-43 in iPSCs or mice |
| FMR1 | Fragile X syndrome | Knockout of FMR1 in neurons |
| NCOA7 | Ovarian aging | Overexpression or knockout in ovarian cells |
| G3BP1 | Cancer stress adaptation | Knockout in cancer cell lines |
| DHX9 | RNA damage response | Point mutation in helicase domain |
Cancer
Cytoplasmic RNP granules contribute to cancer cell adaptation and survival under stress. Stress granules promote hormetic adaptation, allowing tumor cells to withstand chemotherapy and other stresses. Proteotoxic stress drives T cell exhaustion and immune evasion, partly through stress granule-mediated mechanisms, highlighting their role in tumor immunity.
Neurodegeneration
Aberrant phase transitions of RNA-binding proteins such as TDP-43 and FMR1 lead to pathological inclusions in neurodegenerative diseases, including amyotrophic lateral sclerosis (ALS) and fragile X syndrome. Dysfunctional stress granules are implicated in neuronal toxicity and disease progression.
Aging and Ovarian Function
Stress granule clearance mediated by NCOA7 mitigates ovarian aging, suggesting that impaired granule degradation contributes to age-related decline in ovarian function. This links cytoplasmic RNP granule dynamics to reproductive aging.
From cytoplasmic ribonucleoprotein granule-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does G3BP1 knockout abolish stress granule formation? | CRISPR knockout of G3BP1 in HeLa cells |
| How does m7G modification affect QKI-mediated granule recruitment? | Point mutation of QKI binding domain |
| Can NCOA7 overexpression rescue ovarian aging phenotypes? | Knock-in of NCOA7 in mouse models |
| What is the role of DHX9 in RNA damage compartmentalization? | Tagged knock-in of DHX9 for live imaging |
| Does IRE1α coalescence with stress granules require its kinase activity? | Point mutation of IRE1α kinase domain |
| How does DCP5 sense osmotic stress? | Overexpression of DCP5 in plant or mammalian cells |
How to Study the cytoplasmic ribonucleoprotein granule Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Translation efficiency | Identify mRNAs translated in granules |
| RNA-seq | Transcript abundance | Profile granule-enriched RNAs |
| Proteomics | Protein composition | Identify granule components |
| Live-cell imaging | Granule dynamics | Visualize assembly/disassembly |
| CRISPR screen | Gene function | Discover regulators of granule formation |
| CLIP-seq | RNA-protein interactions | Map binding sites of granule proteins |
| FRAP | Molecular mobility | Assess liquid-like properties of granules |
| Single-molecule FISH | RNA localization | Detect specific RNAs in granules |
Ribo-seq and RNA-seq
Ribo-seq measures translation efficiency of mRNAs recruited to granules, while RNA-seq identifies granule-enriched transcripts. These methods reveal how granules modulate gene expression under stress.
Proteomics
Mass spectrometry-based proteomics of isolated granules identifies core and dynamic components, including RNA-binding proteins and signaling factors.
Live-Cell Imaging
Fluorescent tagging of granule proteins (e.g., G3BP1-GFP) enables real-time visualization of granule assembly, disassembly, and dynamics.
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes that regulate granule formation or clearance, providing unbiased insights into granule biology.
How CRISPR Can Be Used to Study GO:0036464 cytoplasmic ribonucleoprotein granule
Knockout
CRISPR knockout of core granule genes such as G3BP1 or TIA1 abolishes granule formation, enabling researchers to test their essential roles in stress responses and disease models.
Point Mutation
Introducing point mutations in genes like DHX9 or IRE1α allows dissection of specific domains required for granule assembly or function, such as helicase activity or kinase signaling.
Knock-in
Knock-in of tagged versions of granule proteins (e.g., GFP-G3BP1) facilitates live-cell imaging and proteomic analysis without altering endogenous regulation.
Overexpression
Overexpression of granule components like NCOA7 or QKI can rescue or exacerbate phenotypes, providing gain-of-function insights into granule-mediated processes.
How EDITGENE Supports cytoplasmic ribonucleoprotein granule Research
Researchers studying cytoplasmic ribonucleoprotein granule-related genes often need to determine whether a candidate gene is causally involved in granule assembly, function, or disease. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this discovery process.
Contact EDITGENE today to design your custom CRISPR model for cytoplasmic ribonucleoprotein granule research.
Frequently Asked Questions About cytoplasmic ribonucleoprotein granule
What is GO:0036464?
GO:0036464 is the Gene Ontology term for cytoplasmic ribonucleoprotein granule, a membraneless compartment in the cytoplasm that concentrates RNAs and RNA-binding proteins.
What is another name for cytoplasmic ribonucleoprotein granule?
It is also known as a Staufen granule.
What genes are involved in cytoplasmic ribonucleoprotein granules?
Key genes include G3BP1, TIA1, DHX9, QKI, NCOA7, and IRE1α, among others.
How are cytoplasmic RNP granules formed?
They form through liquid-liquid phase separation driven by multivalent interactions among RNA-binding proteins and RNAs, often triggered by stress.
What diseases are linked to cytoplasmic RNP granules?
They are implicated in cancer, neurodegeneration, ovarian aging, and immune evasion.
What methods are used to study cytoplasmic RNP granules?
Common methods include Ribo-seq, RNA-seq, proteomics, live-cell imaging, and CRISPR screens.
Can CRISPR be used to study cytoplasmic RNP granules?
Yes, CRISPR knockout, knock-in, point mutation, and overexpression models are widely used to dissect granule gene functions.
What is the role of stress granules in cancer?
Stress granules promote hormetic adaptation of cancer cells, aiding survival under stress and contributing to immune evasion.
How does NCOA7 affect ovarian aging?
NCOA7 mediates stress granule clearance via V-ATPase, and its function mitigates ovarian aging.
What is the significance of m7G modification in granules?
m7G modification on transcripts facilitates their recruitment into stress granules by QKI, influencing mRNA metabolism.
Conclusion
Cytoplasmic ribonucleoprotein granules (GO:0036464) are dynamic, membraneless compartments essential for RNA regulation and stress adaptation. Their assembly, composition, and clearance are governed by a complex network of proteins and RNA modifications, with profound implications for cancer, neurodegeneration, and aging. Continued research using advanced CRISPR models and multi-omics approaches will further illuminate their roles and therapeutic potential.
References
- 1. Ripin N et al.. 2023. Formation, function, and pathology of RNP granules.. Cell 186(22):4737-4756 PMID: 37890457
- 2. Dong T et al.. 2025. Stress granule clearance mediated by V-ATPase-interacting protein NCOA7 mitigates ovarian aging.. Nat Aging 5(8):1548-1567 PMID: 40745099
- 3. Wang Y et al.. 2025. Proteotoxic stress response drives T cell exhaustion and immune evasion.. Nature 647(8091):1025-1035 PMID: 41034580
- 4. Zhou Y et al.. 2024. RNA damage compartmentalization by DHX9 stress granules.. Cell 187(7):1701-1718.e28 PMID: 38503283
- 5. Wang Z et al.. 2024. A cytoplasmic osmosensing mechanism mediated by molecular crowding-sensitive DCP5.. Science 386(6721):eadk9067 PMID: 39480925
- 6. Zhao Z et al.. 2023. QKI shuttles internal m(7)G-modified transcripts into stress granules and modulates mRNA metabolism.. Cell 186(15):3208-3226.e27 PMID: 37379838
- 7. Redding A et al.. 2023. Stress granules and hormetic adaptation of cancer.. Trends Cancer 9(12):995-1005 PMID: 37704502
- 8. Liu S et al.. 2024. Mammalian IRE1α dynamically and functionally coalesces with stress granules.. Nat Cell Biol 26(6):917-931 PMID: 38714852
