GO:0071471 cellular response to non-ionic osmotic stress: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071471 describes how a cell changes its state or activity when the concentration of non-ionic solutes such as mannitol or sorbitol changes in its environment.
• Non-ionic osmotic stress is sensed and countered by ion transport and the accumulation of organic osmolytes, a process known as osmotic adjustment.
• In bacteria such as Escherichia coli and Corynebacterium glutamicum, potassium uptake systems and mechanosensitive channels are central to the response.
• In fission yeast, glycerol synthesis through glycerol-3-phosphate dehydrogenase is required for growth under non-ionic osmotic stress.
• The response can involve rapid redistribution of signaling enzymes such as diacylglycerol kinase eta1 to non-ionic detergent-resistant membranes.
• Studying GO:0071471 helps researchers understand cellular adaptation relevant to microbial survival, plant stress physiology, and human cell volume regulation.
Description
Cells constantly face changes in the osmotic pressure of their surroundings. When the osmotic change is caused by non-ionic solutes such as mannitol or sorbitol, the cell activates a specific set of responses captured by the Gene Ontology term GO:0071471, cellular response to non-ionic osmotic stress. This term is defined as any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating an increase or decrease in the concentration of non-ionic solutes in the environment. Unlike ionic osmotic stress, non-ionic osmotic stress does not directly alter the charge balance across membranes, so cells rely on distinct sensing and adaptation mechanisms. Understanding GO:0071471 matters because osmotic balance is fundamental to cell survival. In bacteria, the response involves rapid ion fluxes and the accumulation of compatible solutes to maintain turgor and protein function. In eukaryotic cells, including yeast and plant cells, the synthesis of glycerol or other osmolytes and the reorganization of signaling lipids are key. These mechanisms are also relevant to human cell physiology, where osmotic stress contributes to tissue homeostasis and disease. This article integrates authoritative QuickGO annotation with verified PubMed literature to provide a research-grade overview of GO:0071471. It covers the definition, core mechanisms, key genes, experimental models, and CRISPR-based methods for dissecting this response. The content is designed for researchers seeking a concise yet comprehensive resource for experimental design and grant writing.
cellular response to non-ionic osmotic stress At A Glance
| GO ID | GO:0071471 |
|---|---|
| GO term | cellular response to non-ionic osmotic stress |
| Ontology | biological_process |
| Synonym | none |
| Definition | Any process that results in a change in state or activity of a cell as a result of a stimulus indicating an increase or decrease in the concentration of non-ionic solutes (e.g. mannitol, sorbitol) in the environment. |
| Major function | Cellular adaptation to changes in non-ionic solute concentration, including ion transport, osmolyte synthesis, and signaling. |
| Related stimuli | Mannitol, sorbitol, and other non-ionic solutes. |
| Key taxa studied | Escherichia coli, Corynebacterium glutamicum, Schizosaccharomyces pombe, Atriplex halimus, and mammalian cells. |
| Example genes | kdpD, gpd1, dgkη, and genes involved in potassium transport and glycerol synthesis. |
What Is GO:0071471?
GO:0071471, cellular response to non-ionic osmotic stress, is a biological process term in the Gene Ontology. It refers to any cellular change in state or activity (such as movement, secretion, enzyme production, or gene expression) that occurs in response to a stimulus indicating an increase or decrease in the concentration of non-ionic solutes, for example mannitol or sorbitol, in the environment. This term is distinct from responses to ionic osmotic stress, which involve charged solutes like NaCl.
Why Is cellular response to non-ionic osmotic stress Important in Cell Biology?
GO:0071471 is important because non-ionic osmotic stress is a common environmental challenge that affects cell viability, growth, and function across all domains of life. In bacteria, the ability to sense and respond to non-ionic osmotic changes is critical for survival in diverse habitats and for pathogenic interactions. In plants, osmotic adjustment to non-ionic solutes influences stress tolerance and crop productivity. In human cells, osmotic stress can trigger signaling cascades and membrane reorganization that impact disease processes. Thus, studying this process provides insights into fundamental cell biology and offers targets for biotechnology and medicine.
• Non-ionic osmotic stress triggers rapid ion transport changes that are essential for maintaining cell volume and turgor.
• Potassium accumulation via channels and transporters is a primary response in bacteria such as Corynebacterium glutamicum.
• The putative osmosensor KdpD in Escherichia coli senses non-ionic osmotic stress to regulate potassium transport.
• Glycerol synthesis via glycerol-3-phosphate dehydrogenase is required for osmotolerance in fission yeast.
• Osmotic shock causes redistribution of diacylglycerol kinase eta1 to non-ionic detergent-resistant membranes, linking lipid signaling to osmotic stress.
• In plants, non-ionic osmotic stress from water deficit induces hormonal changes involving abscisic acid and ethylene.
• Osmotic/matric stress can induce environmental tolerance in bacterial biocontrol agents, affecting their efficacy.
• Understanding non-ionic osmotic stress responses can inform strategies for microbial fermentation and bioproduction.
• Dysregulation of osmotic stress responses is implicated in human diseases such as cancer and neurodegeneration.
• CRISPR-based models enable precise dissection of genes involved in GO:0071471 for therapeutic and biotechnological applications.
What Happens During cellular response to non-ionic osmotic stress?
Sensing non-ionic osmotic changes
In simple terms: The cell first detects that the concentration of non-ionic solutes outside has changed.
Cells sense non-ionic osmotic stress through membrane-associated sensors and changes in turgor pressure. In Escherichia coli, the putative osmosensor KdpD senses alterations in turgor or membrane strain to regulate the kdp operon, which encodes a high-affinity potassium transport system. This sensing mechanism allows the cell to distinguish between ionic and non-ionic osmotic challenges, as shown by differential ion transport responses.
Ion transport and osmotic adjustment
In simple terms: The cell moves ions like potassium in or out to balance water movement.
A primary response to non-ionic osmotic stress is the rapid adjustment of intracellular ion concentrations. In Escherichia coli, exposure to non-ionic osmotica such as sorbitol leads to potassium accumulation and changes in ion transport rates. Similarly, in Corynebacterium glutamicum, channel- and transporter-mediated potassium accumulation is a key component of the osmotic stress response. These ion movements help maintain cell volume and stabilize macromolecules.
Synthesis and accumulation of organic osmolytes
In simple terms: The cell makes or takes up small molecules like glycerol to protect itself.
To counteract sustained non-ionic osmotic stress, cells accumulate compatible organic osmolytes. In fission yeast, glycerol synthesis is essential for osmotolerance, and glycerol-3-phosphate dehydrogenase is a key enzyme in this pathway. The cloning of two distinct genes encoding this enzyme revealed their differential roles in osmotolerance. In plants such as Atriplex halimus, osmotic adjustment involves the accumulation of organic solutes in response to water stress.
Membrane and lipid signaling events
In simple terms: The cell reorganizes its membrane and signaling lipids in response to osmotic shock.
Non-ionic osmotic stress can trigger redistribution of signaling enzymes and changes in membrane composition. Diacylglycerol kinase eta1 translocates to non-ionic detergent-resistant membranes upon osmotic shock, mediated by its pleckstrin homology and C1 domains. This suggests that lipid signaling and membrane microdomains are involved in the cellular response to non-ionic osmotic stress.
Integration with stress tolerance and environmental adaptation
In simple terms: The response helps the cell survive and even become more tolerant to other stresses.
The cellular response to non-ionic osmotic stress can induce cross-tolerance to other environmental challenges. In bacterial biocontrol agents, exposure to osmotic/matric stress and heat shock enhances environmental tolerance against Fusarium verticillioides. This integration highlights the broader ecological and applied significance of GO:0071471.
Key Genes Involved in GO:0071471 cellular response to non-ionic osmotic stress
The following genes and proteins are experimentally implicated in the cellular response to non-ionic osmotic stress (GO:0071471).
| Gene | Major Role | Research Relevance |
|---|---|---|
| kdpD | Putative osmosensor regulating potassium transport in Escherichia coli | Model for sensing non-ionic osmotic stress |
| kdpABC | High-affinity potassium transport system | Target for ion transport studies under non-ionic osmotic stress |
| gpd1 | Glycerol-3-phosphate dehydrogenase for glycerol synthesis in fission yeast | Key enzyme for osmotolerance |
| gpd2 | Second glycerol-3-phosphate dehydrogenase gene in fission yeast | Distinct role in osmotolerance |
| dgkη | Diacylglycerol kinase eta1, redistributes to detergent-resistant membranes | Links lipid signaling to osmotic shock |
| trkA | Potassium uptake transporter in Corynebacterium glutamicum | Channel- and transporter-mediated potassium accumulation |
| trkH | Potassium uptake transporter in Corynebacterium glutamicum | Potassium accumulation under osmotic stress |
| mscL | Mechanosensitive channel | Potential role in osmotic stress response |
| proP | Proline/betaine transporter | Osmolyte uptake in bacteria |
| proU | Glycine betaine transport system | Osmotic adjustment |
| betA | Choline dehydrogenase for betaine synthesis | Osmolyte production |
| betB | Betaine aldehyde dehydrogenase | Osmolyte production |
| otsA | Trehalose-6-phosphate synthase | Osmolyte synthesis |
| otsB | Trehalose-6-phosphate phosphatase | Osmolyte synthesis |
| NCED | 9-cis-epoxycarotenoid dioxygenase in plants | Abscisic acid synthesis under water stress |
| ACS | 1-aminocyclopropane-1-carboxylate synthase | Ethylene synthesis under osmotic stress |
| ACO | 1-aminocyclopropane-1-carboxylate oxidase | Ethylene synthesis under osmotic stress |
How Is cellular response to non-ionic osmotic stress Regulated?
The cellular response to non-ionic osmotic stress is regulated at multiple levels. In Escherichia coli, the sensor kinase KdpD autophosphorylates in response to changes in turgor or membrane strain and transfers phosphate to KdpE, which activates transcription of the kdp operon. This two-component system provides a rapid transcriptional response to non-ionic osmotic stress. In fission yeast, the expression and activity of glycerol-3-phosphate dehydrogenases are regulated to control glycerol synthesis, which is essential for osmotolerance. Additionally, osmotic shock induces post-translational redistribution of diacylglycerol kinase eta1 to membrane microdomains, indicating regulation by lipid-protein interactions. In plants, hormonal signals such as abscisic acid and ethylene modulate the response to water stress, which involves non-ionic osmotic components.
cellular response to non-ionic osmotic stress and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| dgkη | Cancer signaling, osmotic stress response | Knockout and point mutation in human cell lines |
| kdpD | Bacterial pathogenesis, osmotic sensing | Knockout in Escherichia coli and infection models |
| gpd1 | Osmotolerance, fungal stress response | Knockout in Schizosaccharomyces pombe |
| NCED | Plant drought tolerance | Knockout and overexpression in Arabidopsis |
| ACS | Plant ethylene synthesis under stress | Knockout in Atriplex halimus or model plants |
Osmotic stress in cancer
Cancer cells often face osmotic imbalances in the tumor microenvironment. The ability to adapt to non-ionic osmotic stress may influence cell survival and proliferation. Diacylglycerol kinase eta1, which redistributes under osmotic shock, has been implicated in signaling pathways relevant to cancer. However, direct evidence linking GO:0071471 to cancer remains limited and requires further investigation.
Neurodegeneration and osmotic stress
Neurons are sensitive to osmotic changes, and dysregulation of osmotic stress responses can contribute to neurodegeneration. While non-ionic osmotic stress specifically has not been extensively studied in neurodegeneration, the general principles of osmotic adaptation are relevant. Further research is needed to establish direct connections.
Microbial pathogenesis and osmotic stress
Pathogenic bacteria must adapt to non-ionic osmotic stress during host colonization. The KdpD/KdpE system in Escherichia coli is an example of a sensor that responds to non-ionic osmotic stress and may contribute to virulence. Understanding these mechanisms can inform antimicrobial strategies.
Plant stress tolerance
In agriculture, non-ionic osmotic stress from drought affects crop yields. Plants like Atriplex halimus adjust osmotically through hormonal changes involving abscisic acid and ethylene. Studying GO:0071471 can aid in breeding stress-tolerant crops.
From cellular response to non-ionic osmotic stress-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does kdpD sense non-ionic osmotic stress? | Knockout of kdpD in Escherichia coli followed by osmotic challenge |
| Is gpd1 required for osmotolerance? | Knockout of gpd1 in Schizosaccharomyces pombe |
| How does dgkη redistribute under osmotic shock? | Tagged knock-in of dgkη in mammalian cells |
| What is the role of potassium transporters in Corynebacterium glutamicum? | Knockout of trkA/trkH and osmotic stress assays |
| Does overexpression of osmolyte synthesis genes improve tolerance? | Overexpression of otsA/otsB in Escherichia coli |
| How do plant hormones regulate non-ionic osmotic stress? | Knockout of NCED or ACS in plant models |
How to Study the cellular response to non-ionic osmotic stress Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify upregulated osmolyte synthesis genes |
| Proteomics | Protein abundance and modifications | Detect KdpD phosphorylation |
| Phosphoproteomics | Phosphorylation events | Map signaling pathways in osmotic stress |
| Live-cell imaging | Protein localization and membrane dynamics | Track dgkη redistribution |
| CRISPR knockout library screening | Gene essentiality under osmotic stress | Discover novel osmotic stress genes |
| Osmotic stress survival assays | Cell viability and growth | Test knockout or overexpression strains |
| Metabolomics | Osmolyte levels (e.g., glycerol, trehalose) | Quantify osmotic adjustment |
Transcriptomics and RNA-seq
RNA sequencing can identify global gene expression changes in response to non-ionic osmotic stress. In Escherichia coli, transcriptomic profiling after sorbitol treatment reveals upregulation of ion transport and osmolyte synthesis genes. Similarly, in Corynebacterium glutamicum, RNA-seq has been used to study the impact of potassium accumulation on osmotic stress response.
Proteomics and phosphoproteomics
Proteomic approaches can detect changes in protein abundance and post-translational modifications during non-ionic osmotic stress. For example, the phosphorylation state of the sensor KdpD is critical for its function. Phosphoproteomics can reveal signaling events downstream of osmotic stress.
Live-cell imaging and membrane dynamics
Fluorescence microscopy can track the redistribution of proteins like diacylglycerol kinase eta1 to detergent-resistant membranes upon osmotic shock. This method provides spatial and temporal resolution of the cellular response.
Genetic screens and CRISPR libraries
CRISPR knockout libraries enable unbiased identification of genes required for survival under non-ionic osmotic stress. Such screens can be performed in bacteria, yeast, or mammalian cells to discover novel components of GO:0071471.
How CRISPR Can Be Used to Study GO:0071471 cellular response to non-ionic osmotic stress
Knockout
CRISPR knockout is used to delete genes such as kdpD, gpd1, or dgkη to test their requirement for the cellular response to non-ionic osmotic stress. For example, knockout of gpd1 in fission yeast abolishes glycerol synthesis and reduces osmotolerance. In Escherichia coli, kdpD knockout impairs potassium transport under osmotic stress.
Point Mutation
Point mutations can be introduced to dissect specific domains or phosphorylation sites. For instance, mutating the phosphorylation site in KdpD would test its role in sensing non-ionic osmotic stress. Similarly, point mutations in the pleckstrin homology domain of dgkη could affect its membrane redistribution.
Knock-in
Knock-in of tagged versions of genes (e.g., GFP-dgkη) allows real-time visualization of protein localization under osmotic stress. Knock-in of reporter genes can also be used to monitor transcriptional responses.
Overexpression
Overexpression of osmolyte synthesis genes such as otsA/otsB or gpd1 can enhance tolerance to non-ionic osmotic stress. CRISPR activation (CRISPRa) can be used to upregulate endogenous genes for gain-of-function studies.
How EDITGENE Supports cellular response to non-ionic osmotic stress Research
Researchers studying cellular response to non-ionic osmotic stress-related genes often need to determine whether a candidate gene is causally involved in the response or is merely correlated with it. EDITGENE provides a comprehensive suite of CRISPR-based services to enable precise genetic manipulation and functional validation in relevant cell models.
Contact EDITGENE today to design your custom CRISPR model for cellular response to non-ionic osmotic stress research.
Frequently Asked Questions About cellular response to non-ionic osmotic stress
What is GO:0071471?
GO:0071471 is the Gene Ontology term for cellular response to non-ionic osmotic stress, defined as any cellular change in state or activity resulting from a change in the concentration of non-ionic solutes such as mannitol or sorbitol.
What genes are involved in cellular response to non-ionic osmotic stress?
Key genes include kdpD, gpd1, gpd2, dgkη, and genes encoding potassium transporters and osmolyte synthesis enzymes.
How do cells sense non-ionic osmotic stress?
Cells sense non-ionic osmotic stress through membrane-associated sensors like KdpD in Escherichia coli, which detects changes in turgor or membrane strain.
What is the difference between ionic and non-ionic osmotic stress?
Ionic osmotic stress involves charged solutes like NaCl, while non-ionic osmotic stress involves uncharged solutes like mannitol or sorbitol, leading to distinct cellular responses.
Which organisms are used to study non-ionic osmotic stress?
Common models include Escherichia coli, Corynebacterium glutamicum, Schizosaccharomyces pombe, and plants such as Atriplex halimus.
What are the main cellular responses to non-ionic osmotic stress?
Main responses include ion transport, accumulation of organic osmolytes like glycerol, and membrane lipid reorganization.
How is glycerol synthesis related to non-ionic osmotic stress?
In fission yeast, glycerol synthesis via glycerol-3-phosphate dehydrogenase is essential for osmotolerance under non-ionic osmotic stress.
Can CRISPR be used to study non-ionic osmotic stress?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable precise dissection of genes involved in GO:0071471.
What diseases are linked to non-ionic osmotic stress?
Non-ionic osmotic stress is relevant to cancer, neurodegeneration, and microbial pathogenesis, though direct links require further study.
What methods are used to study cellular response to non-ionic osmotic stress?
Methods include RNA-seq, proteomics, live-cell imaging, and CRISPR library screening.
Conclusion
GO:0071471, cellular response to non-ionic osmotic stress, encompasses a complex set of cellular adaptations that are critical for survival across diverse organisms. From bacterial ion transport to yeast glycerol synthesis and plant hormonal regulation, the mechanisms are conserved yet tailored to each cell type. Understanding these processes has implications for biotechnology, agriculture, and human health. By leveraging CRISPR-based tools and multi-omics approaches, researchers can dissect the genetic basis of this response with unprecedented precision. EDITGENE provides the necessary services to accelerate such discoveries, from knockout models to library screening and bioinformatics.
References
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- 2. Ochrombel I et al.. 2011. Osmotic stress response in C. glutamicum: impact of channel- and transporter-mediated potassium accumulation.. Arch Microbiol 193(11):787-96 PMID: 21614527
- 3. Matsutomo D et al.. 2013. Osmotic shock-dependent redistribution of diacylglycerol kinase η1 to non-ionic detergent-resistant membrane via pleckstrin homology and C1 domains.. J Biochem 153(2):179-90 PMID: 23127959
- 5. Sugiura A et al.. 1994. Signal-sensing mechanisms of the putative osmosensor KdpD in Escherichia coli.. Mol Microbiol 14(5):929-38 PMID: 7715454
- 6. Hassine AB et al.. 2010. Differential responses of saltbush Atriplex halimus L. exposed to salinity and water stress in relation to senescing hormones abscisic acid and ethylene.. J Plant Physiol 167(17):1448-56 PMID: 20869134
- 7. Ohmiya R et al.. 1995. Osmoregulation of fission yeast: cloning of two distinct genes encoding glycerol-3-phosphate dehydrogenase, one of which is responsible for osmotolerance for growth.. Mol Microbiol 18(5):963-73 PMID: 8825100
- 8. Sartori M et al.. 2010. Impact of osmotic/matric stress and heat shock on environmental tolerance induction of bacterial biocontrol agents against Fusarium verticillioides.. Res Microbiol 161(8):681-6 PMID: 20624459
