GO:0062028 regulation of cytoplasmic stress granule assembly: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0062028 describes any process that modulates the rate, frequency or extent of cytoplasmic stress granule assembly, the aggregation of proteins and RNA into membraneless granules.
• Stress granule assembly is driven by liquid-liquid phase separation of low-complexity domains in proteins such as G3BP1, which acts as a tunable switch for condensation.
• G3BP1 is a core scaffold and a key regulatory node; its ubiquitination by TRIM21 and autophagic clearance control stress granule homeostasis.
• Metabolites such as S-adenosylmethionine (AdoMet) regulate stress granule assembly in a conserved manner.
• Dysregulation of stress granule assembly is linked to cancer chemoresistance, neurodevelopmental disorders, and inflammatory diseases.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal dissection of regulators of stress granule assembly.
Description
Cytoplasmic stress granules (SGs) are membraneless organelles that assemble when cells experience stress, such as heat shock, oxidative stress, or viral infection. The process of their assembly is tightly controlled, and the Gene Ontology term GO:0062028, regulation of cytoplasmic stress granule assembly, encompasses any process that modulates the rate, frequency, or extent of this aggregation of proteins and RNA. Understanding this regulation is critical because stress granules influence cell survival, signaling, and disease progression. The core scaffold protein G3BP1 acts as a tunable switch that triggers phase separation to assemble stress granules, and its levels and modifications are central to regulation. Moreover, low-complexity domains in RNA-binding proteins promote phase separation and can drive pathological fibrillization, linking SG regulation to neurodegeneration. Regulation occurs at multiple levels, including post-translational modifications, metabolite availability, and interactions with non-coding RNAs. For example, TRIM21-mediated ubiquitination of G3BP1 and autophagy-dependent elimination of stress granules modulate SG homeostasis. The metabolite S-adenosylmethionine (AdoMet) regulates SG assembly in a conserved manner. Circular RNA CircRNA-CREIT inhibits stress granule assembly by destabilizing PKR, thereby overcoming doxorubicin resistance in triple-negative breast cancer. De novo variants in genes regulating stress granule assembly are associated with neurodevelopmental disorders, highlighting the clinical importance of this process. For researchers, GO:0062028 provides a framework to study how cells control the formation and disassembly of stress granules. Dysregulation of SG assembly contributes to cancer, neurodegeneration, and inflammatory conditions, making it a target for therapeutic intervention. This article reviews the mechanisms, key genes, disease links, and research methods relevant to regulation of cytoplasmic stress granule assembly.
regulation of cytoplasmic stress granule assembly At A Glance
| GO ID | GO:0062028 |
|---|---|
| GO term | regulation of cytoplasmic stress granule assembly |
| Ontology | biological_process |
| Synonym | regulation of stress granule assembly |
| Definition | Any process that modulates the rate, frequency or extent of cytoplasmic stress granule assembly, the aggregation, arrangement and bonding together of proteins and RNA molecules to form a cytoplasmic stress granule. |
| Major function | Controls the formation and dynamics of stress granules in response to cellular stress. |
| Related cellular component | Cytoplasmic stress granule (GO:0010494) |
| Related molecular functions | RNA binding, protein binding, phase separation |
| Key regulators | G3BP1, TRIM21, PKR, AdoMet metabolism |
What Is GO:0062028?
GO:0062028, regulation of cytoplasmic stress granule assembly, is defined as any process that modulates the rate, frequency or extent of cytoplasmic stress granule assembly, the aggregation, arrangement and bonding together of proteins and RNA molecules to form a cytoplasmic stress granule. In other words, it includes all molecular events that promote, inhibit, or fine-tune the formation of these membraneless organelles in the cytoplasm.
Why Is regulation of cytoplasmic stress granule assembly Important in Cell Biology?
Regulation of cytoplasmic stress granule assembly is important because stress granules are central hubs for mRNA storage, translation control, and signaling during stress. Their assembly and disassembly must be tightly regulated to maintain cell survival; dysregulation is linked to cancer chemoresistance, neurodevelopmental disorders, and inflammatory diseases. Understanding GO:0062028 helps researchers identify therapeutic targets and biomarkers.
• Stress granules modulate cell survival under stress conditions.
• G3BP1 is a key scaffold and switch for stress granule assembly.
• TRIM21-mediated ubiquitination of G3BP1 regulates stress granule homeostasis.
• AdoMet metabolism controls stress granule assembly in a conserved manner.
• CircRNA-CREIT inhibits stress granule assembly and overcomes doxorubicin resistance in TNBC.
• De novo variants in SG assembly genes associate with neurodevelopmental disorders.
• Stress granule assembly impairs macrophage efferocytosis in allergic rhinitis.
• Low-complexity domains drive phase separation and pathological fibrillization.
• G3BP1 is implicated in various diseases including cancer and neurodegeneration.
• Targeting SG regulation may enhance chemotherapy efficacy.
What Happens During regulation of cytoplasmic stress granule assembly?
Initiation by stress-induced phase separation
In simple terms: When cells are stressed, certain proteins clump together to form tiny droplets, starting the assembly of stress granules.
Stress granule assembly begins with liquid-liquid phase separation (LLPS) of RNA-binding proteins containing low-complexity domains. G3BP1 acts as a tunable switch that triggers phase separation to assemble stress granules. Low-complexity domains promote phase separation and can drive pathological fibrillization. This initiation is regulated by changes in the cellular environment, such as altered metabolite levels.
Scaffold recruitment and granule growth
In simple terms: Once the first droplets form, more proteins and RNAs join in, making the granules bigger.
Following initiation, core scaffold proteins such as G3BP1 recruit additional RNA-binding proteins and mRNAs to grow the stress granule. G3BP1 is a core element in various diseases and its interactions are critical for granule assembly. The process is dynamic and reversible, allowing granules to disassemble when stress subsides.
Post-translational modifications and clearance
In simple terms: Chemical tags on proteins can mark stress granules for destruction, keeping their levels balanced.
Regulation also involves post-translational modifications. TRIM21-mediated ubiquitination of G3BP1 targets stress granules for autophagy-dependent elimination, modulating stress granule homeostasis. This clearance mechanism prevents excessive accumulation of stress granules, which can be toxic.
Metabolite and non-coding RNA regulation
In simple terms: Small molecules and circular RNAs can influence whether stress granules form or not.
Metabolites such as S-adenosylmethionine (AdoMet) regulate stress granule assembly in a conserved manner. Additionally, circular RNA CircRNA-CREIT inhibits stress granule assembly by destabilizing PKR, thereby overcoming doxorubicin resistance in triple-negative breast cancer. These examples highlight diverse regulatory inputs.
Physiological consequences and disease links
In simple terms: When stress granule regulation goes wrong, it can contribute to diseases like cancer and neurological disorders.
Dysregulated stress granule assembly impairs macrophage efferocytosis to aggravate allergic rhinitis in mice. De novo variants in genes regulating stress granule assembly associate with neurodevelopmental disorders. Thus, proper regulation is essential for health.
Key Genes Involved in GO:0062028 regulation of cytoplasmic stress granule assembly
The following genes and proteins are key players in the regulation of cytoplasmic stress granule assembly, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| G3BP1 | Core scaffold and tunable switch for phase separation and stress granule assembly | Central regulator; target for modulating SG formation in disease |
| TRIM21 | E3 ubiquitin ligase that ubiquitinates G3BP1, leading to autophagic clearance of stress granules | Regulates SG homeostasis; potential target for diseases with SG accumulation |
| PKR (EIF2AK2) | Kinase activated by stress; its destabilization by CircRNA-CREIT inhibits SG assembly | Links stress signaling to SG regulation; target in cancer chemoresistance |
| AdoMet (metabolite, not gene) | Conserved metabolite that regulates stress granule assembly | Metabolic control of SG assembly; potential dietary or pharmacological intervention |
| CircRNA-CREIT | Non-coding RNA that inhibits stress granule assembly by destabilizing PKR | Therapeutic potential in triple-negative breast cancer |
| G3BP2 | Paralog of G3BP1; may contribute to SG assembly (implied by family) | Potential redundancy or specificity in SG regulation |
| TIA1 | RNA-binding protein with low-complexity domain that promotes phase separation | Model for studying LLPS and pathological fibrillization |
| FUS | RNA-binding protein with low-complexity domain; mutations linked to ALS | Implicated in neurodegeneration via aberrant phase separation |
| TDP-43 | RNA-binding protein that can undergo phase separation; associated with ALS | Studied for pathological fibrillization in neurodegeneration |
| hnRNPA1 | Low-complexity domain protein that phase separates | Model for LLPS and fibrillization |
| eIF2α | Translation initiation factor; phosphorylation inhibits translation and promotes SG assembly (implied by stress response) | Key node in stress response pathways |
| Ataxin-2 | RNA-binding protein that interacts with G3BP1 and modulates SG assembly (implied by SG biology) | Potential modifier in neurodegeneration |
| VCP/p97 | AAA-ATPase involved in stress granule disassembly (implied by autophagy clearance) | Regulates SG clearance; linked to neurodegeneration |
| SQSTM1/p62 | Autophagy receptor that recognizes ubiquitinated SG proteins | Mediates autophagic clearance of SGs |
| LC3 | Autophagosome marker involved in SG elimination | Marker for autophagic flux during SG clearance |
| RACK1 | Ribosome-associated protein that may modulate SG assembly (implied by SG composition) | Potential regulator of translation-related SG assembly |
| Caprin-1 | RNA-binding protein that co-localizes with G3BP1 in SGs (implied by SG composition) | Component of SG core; potential target |
| USP10 | Deubiquitinase that may counteract G3BP1 ubiquitination (implied by ubiquitin balance) | Potential regulator of SG homeostasis |
How Is regulation of cytoplasmic stress granule assembly Regulated?
Regulation of cytoplasmic stress granule assembly is controlled by multiple signaling pathways and mechanisms. The integrated stress response (ISR), involving phosphorylation of eIF2α, promotes SG assembly by inhibiting translation initiation. Post-translational modifications, such as ubiquitination of G3BP1 by TRIM21, target SGs for autophagic degradation, thereby limiting their accumulation. Metabolite levels, notably S-adenosylmethionine (AdoMet), regulate SG assembly in a conserved manner. Additionally, non-coding RNAs like CircRNA-CREIT can inhibit SG assembly by destabilizing PKR. These layers of regulation ensure that SGs form transiently and are cleared appropriately.
regulation of cytoplasmic stress granule assembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| G3BP1 | Cancer, neurodegeneration, various diseases | Knockout and overexpression cell models to study SG assembly and drug response |
| TRIM21 | Stress granule homeostasis, autoimmune diseases | Knockout cells to assess SG clearance and autophagy |
| PKR (EIF2AK2) | Triple-negative breast cancer chemoresistance | Point mutation or knockout to study CircRNA-CREIT interaction |
| FUS | Amyotrophic lateral sclerosis (ALS) | Knock-in of disease mutations to study phase separation and fibrillization |
| TDP-43 | ALS and frontotemporal dementia | Overexpression or knockout to model pathological aggregation |
Cancer chemoresistance
Stress granule assembly contributes to chemoresistance in cancer. CircRNA-CREIT inhibits stress granule assembly and overcomes doxorubicin resistance in triple-negative breast cancer by destabilizing PKR. G3BP1, a core SG protein, is implicated in various diseases including cancer, making SG regulation a potential therapeutic target.
Neurodevelopmental disorders
De novo variants in genes regulating stress granule assembly associate with neurodevelopmental disorders, indicating that proper SG regulation is critical for brain development. Dysregulation of phase separation and fibrillization of RNA-binding proteins like FUS and TDP-43 is linked to neurodegeneration.
Inflammatory and allergic diseases
Stress granule assembly impairs macrophage efferocytosis to aggravate allergic rhinitis in mice, suggesting that SG regulation influences inflammatory responses. Modulating SG assembly could be a strategy for allergic diseases.
Neurodegeneration
Pathological fibrillization driven by low-complexity domains of proteins such as FUS and TDP-43 is associated with neurodegenerative diseases like ALS. Regulation of SG assembly is therefore relevant to neurodegeneration.
From regulation of cytoplasmic stress granule assembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of G3BP1 abolish stress granule assembly? | G3BP1 knockout cell line |
| How do disease-associated mutations in FUS affect phase separation? | FUS point-mutation knock-in cell line |
| Can tagging G3BP1 with a fluorescent protein track SG dynamics? | Tagged knock-in of G3BP1 with GFP |
| Does overexpression of TRIM21 enhance SG clearance? | TRIM21 overexpression cell line |
| What is the role of AdoMet in SG assembly? | Metabolite modulation in wild-type and knockout cells |
| Can CircRNA-CREIT inhibit SG assembly in cancer cells? | CircRNA-CREIT overexpression in TNBC cell lines |
How to Study the regulation of cytoplasmic stress granule assembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Fluorescence microscopy | Granule number, size, dynamics | Visualizing SG assembly in live cells |
| RNA-seq | Transcriptome changes | Identifying mRNAs enriched in SGs |
| Ribo-seq | Translation efficiency | Assessing translational control during SG assembly |
| Proteomics | Protein composition of SGs | Discovering novel SG components |
| CRISPR knockout screening | Genes required for SG assembly | Identifying regulators |
| Immunoprecipitation | Protein-protein interactions | Studying G3BP1 interactions |
| Autophagy flux assays | SG clearance | Measuring TRIM21-mediated degradation |
Fluorescence microscopy and live-cell imaging
Fluorescence microscopy using GFP-tagged SG markers such as G3BP1 allows visualization of stress granule assembly and dynamics in live cells. This method is essential for quantifying granule number, size, and kinetics.
RNA-seq and Ribo-seq
RNA sequencing and ribosome profiling can reveal changes in mRNA translation and transcript stability during SG assembly, providing insights into the regulatory role of SGs in gene expression.
Proteomics and interactomics
Mass spectrometry-based proteomics can identify proteins that co-purify with stress granules, uncovering novel regulators and components. Proximity labeling approaches can map interactions in living cells.
CRISPR screening
Genome-wide CRISPR knockout or activation screens can identify genes that regulate stress granule assembly, as demonstrated by the association of de novo variants in SG genes with neurodevelopmental disorders.
How CRISPR Can Be Used to Study GO:0062028 regulation of cytoplasmic stress granule assembly
Knockout
CRISPR knockout of genes such as G3BP1 or TRIM21 can abolish or alter stress granule assembly, providing causal evidence for their roles. Knockout cell lines are valuable for studying the necessity of specific regulators.
Point Mutation
Introducing point mutations in genes like FUS or TDP-43 that are associated with neurodegeneration allows researchers to study how specific amino acid changes affect phase separation and fibrillization. This helps model disease-associated variants.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into endogenous G3BP1 enables real-time tracking of stress granule dynamics without overexpression artifacts. Knock-in of disease mutations can also model human disorders.
Overexpression
Overexpression of regulators such as TRIM21 or CircRNA-CREIT can enhance stress granule clearance or inhibit assembly, respectively, providing gain-of-function insights. Overexpression models are useful for testing therapeutic hypotheses.
How EDITGENE Supports regulation of cytoplasmic stress granule assembly Research
Researchers studying regulation of cytoplasmic stress granule assembly-related genes often need to determine whether a candidate gene is causally involved in granule formation, clearance, or disease progression. EDITGENE provides comprehensive CRISPR-based services to create precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for regulation of cytoplasmic stress granule assembly research.
Frequently Asked Questions About regulation of cytoplasmic stress granule assembly
What is GO:0062028?
GO:0062028 is the Gene Ontology term for regulation of cytoplasmic stress granule assembly, describing any process that modulates the rate, frequency or extent of stress granule assembly.
What genes are involved in regulation of cytoplasmic stress granule assembly?
Key genes include G3BP1, TRIM21, PKR, FUS, TDP-43, and others that regulate phase separation and clearance.
How is stress granule assembly regulated?
It is regulated by phase separation of low-complexity domains, post-translational modifications like ubiquitination, metabolite levels such as AdoMet, and non-coding RNAs.
What diseases are linked to stress granule assembly?
Diseases include cancer chemoresistance, neurodevelopmental disorders, neurodegeneration, and allergic rhinitis.
What is the role of G3BP1 in stress granules?
G3BP1 acts as a core scaffold and tunable switch that triggers phase separation to assemble stress granules.
How does TRIM21 regulate stress granules?
TRIM21 ubiquitinates G3BP1, leading to autophagy-dependent elimination of stress granules, thus modulating homeostasis.
Can stress granules be targeted for cancer therapy?
Yes, inhibiting stress granule assembly by targeting PKR with CircRNA-CREIT overcomes doxorubicin resistance in triple-negative breast cancer.
What methods are used to study stress granule assembly?
Common methods include fluorescence microscopy, RNA-seq, Ribo-seq, proteomics, and CRISPR screens.
What are de novo variants in SG assembly genes associated with?
They are associated with neurodevelopmental disorders.
How does AdoMet affect stress granules?
AdoMet is a conserved metabolite that regulates stress granule assembly.
Conclusion
Regulation of cytoplasmic stress granule assembly (GO:0062028) is a critical biological process that controls the formation and disassembly of membraneless organelles in response to stress. Key regulators such as G3BP1, TRIM21, and PKR, along with metabolites and non-coding RNAs, fine-tune this process. Dysregulation is linked to cancer, neurodegeneration, and inflammatory diseases, making it a promising therapeutic target. CRISPR-based models and advanced omics methods are essential tools for dissecting the underlying mechanisms.
References
- 1. Yang C et al.. 2023. Stress granule homeostasis is modulated by TRIM21-mediated ubiquitination of G3BP1 and autophagy-dependent elimination of stress granules.. Autophagy 19(7):1934-1951 PMID: 36692217
- 2. Yang P et al.. 2020. G3BP1 Is a Tunable Switch that Triggers Phase Separation to Assemble Stress Granules.. Cell 181(2):325-345.e28 PMID: 32302571
- 3. Molliex A et al.. 2015. Phase separation by low complexity domains promotes stress granule assembly and drives pathological fibrillization.. Cell 163(1):123-33 PMID: 26406374
- 4. Guo J et al.. 2024. Application of stress granule core element G3BP1 in various diseases: A review.. Int J Biol Macromol 282(Pt 5):137254 PMID: 39515684
- 5. Zhou Y et al.. 2025. Stress granule assembly impairs macrophage efferocytosis to aggravate allergic rhinitis in mice.. Nat Commun 16(1):5610 PMID: 40595582
- 6. Begovich K et al.. 2020. Conserved metabolite regulation of stress granule assembly via AdoMet.. J Cell Biol 219(8) PMID: 32609300
- 7. Wang X et al.. 2022. CircRNA-CREIT inhibits stress granule assembly and overcomes doxorubicin resistance in TNBC by destabilizing PKR.. J Hematol Oncol 15(1):122 PMID: 36038948
- 8. Jia X et al.. 2022. De novo variants in genes regulating stress granule assembly associate with neurodevelopmental disorders.. Sci Adv 8(33):eabo7112 PMID: 35977029
