GO:0010157 response to chlorate: Nitrate Analogue Stress Response, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0010157 response to chlorate describes any process by which a cell or organism changes its state or activity in response to a chlorate stimulus.
• Chlorate (ClO3-) is a nitrate analogue that is taken up and reduced by nitrate-assimilating enzymes, making it a powerful tool for probing nitrogen metabolism and identifying nitrogen use efficiency genes.
• In bacteria such as Pseudomonas aeruginosa, chlorate toxicity arises from its reduction to chlorite, which is toxic, and resistance mechanisms involve nitrate reductase and efflux systems.
• Chlorate and chlorite are toxic to diverse organisms including algae, bacteria, and fungi, with sensitivity varying by species and metabolic capacity.
• In animals, chlorate salts are used as feed additives and have been studied for their metabolism and toxic responses, including methemoglobin formation.
• Research on response to chlorate integrates microbiology, plant genetics, and toxicology, with applications in agriculture, bioremediation, and food safety.
Description
GO:0010157 response to chlorate is a biological process term defined as any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a chlorate stimulus. Chlorate is a chemical analogue of nitrate and is widely used in research to study nitrate assimilation, because it is taken up by nitrate transporters and reduced by nitrate reductase to chlorite, a toxic compound. This property makes chlorate both a selective agent and a probe for nitrogen metabolism in plants, algae, bacteria, and fungi. The importance of response to chlorate spans multiple disciplines. In agriculture, chlorate sensitivity is used to identify candidate genes for nitrogen use efficiency in crops such as barley, where chlorate serves as a nitrate analogue to screen for mutants. In microbiology, chlorate respiration and toxicity have been studied in dissimilatory perchlorate-reducing bacteria and in Pseudomonas aeruginosa, revealing mechanisms of chlorate reduction and resistance. In toxicology, chlorate salts are evaluated for their efficacy, metabolism, and toxic responses in food and laboratory animals, including effects on thyroid function and red blood cells. Understanding the molecular and physiological responses to chlorate is therefore relevant for optimizing nitrogen fertilizer use, developing antimicrobial strategies, and assessing environmental and food safety risks. This article synthesizes authoritative QuickGO data and verified PubMed literature to provide a research-grade overview of GO:0010157, its mechanisms, key genes, and experimental approaches.
response to chlorate At A Glance
| GO ID | GO:0010157 |
|---|---|
| GO term | response to chlorate |
| Ontology | biological_process |
| Synonym | none |
| Definition | Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a chlorate stimulus. |
| Major function | Detection and response to chlorate, often via nitrate assimilation pathways and stress responses. |
| Related stimuli | Chlorate is a nitrate analogue; response often overlaps with nitrate and chlorite responses. |
| Taxonomic range | Observed in bacteria, algae, fungi, plants, and animals. |
| Research applications | Screening for nitrogen use efficiency genes, studying microbial chlorate respiration, and toxicology. |
What Is GO:0010157?
In our own words, GO:0010157 response to chlorate refers to the collection of cellular and organismal processes triggered when a cell or organism encounters chlorate. This includes changes in gene expression, enzyme activity, transport, and metabolic flux that collectively constitute a response to the chlorate stimulus. The term is a biological process and does not imply a specific outcome; rather, it encompasses any measurable change in state or activity caused by chlorate.
Why Is response to chlorate Important in Cell Biology?
Response to chlorate is important because chlorate is both an environmental contaminant and a valuable research tool. In agriculture, chlorate sensitivity is exploited to identify genes involved in nitrate uptake and reduction, which are critical for nitrogen use efficiency and sustainable fertilizer management. In microbiology, chlorate reduction is linked to anaerobic respiration and bioremediation of perchlorate-contaminated sites. In toxicology, chlorate salts are used as food additives and disinfectants, and their potential toxicity to animals and humans necessitates understanding of their metabolism and effects. Thus, GO:0010157 bridges fundamental nitrogen metabolism, environmental microbiology, and public health.
• Chlorate is a nitrate analogue used to select for nitrate assimilation mutants in plants and algae.
• Chlorate toxicity in bacteria is mediated by reduction to chlorite, informing antimicrobial and resistance studies.
• Dissimilatory perchlorate-reducing bacteria can use chlorate as an electron acceptor, relevant for bioremediation.
• Chlorate salts are used in animal feed and food processing, raising food safety and toxicological concerns.
• Response to chlorate overlaps with nitrate signaling and nitrogen use efficiency, a major agronomic trait.
• Chlorate and chlorite are toxic to algae, bacteria, and fungi, affecting environmental microbial communities.
• Methionine oxidation under anaerobic conditions in E. coli may intersect with chlorate stress responses.
• Chlorate-based compounds are studied in materials science, indicating broader chemical interest.
• Understanding chlorate response can guide development of nitrogen-efficient crops and improved fertilizers.
• Chlorate toxicity mechanisms inform risk assessment for drinking water and food.
What Happens During response to chlorate?
Uptake and Transport of Chlorate
In simple terms: Chlorate enters cells through the same doors used for nitrate.
Chlorate is taken up by nitrate transporters because it is a structural analogue of nitrate. In barley, chlorate has been used as a nitrate analogue to identify candidate genes for nitrogen use efficiency, implying that nitrate transporters and assimilation enzymes mediate its uptake and subsequent effects. In bacteria, chlorate uptake may involve specific transporters or channels, though details vary by species.
Reduction to Chlorite and Toxicity
In simple terms: Once inside, chlorate is converted to a toxic chemical called chlorite.
Nitrate reductase can reduce chlorate to chlorite, which is toxic to cells. In Pseudomonas aeruginosa, mechanisms of chlorate toxicity and resistance involve reduction to chlorite and subsequent cellular damage. Similarly, in algae, bacteria, and fungi, chlorate toxicity is attributed to its reduction to chlorite. This reduction is a key step in the response to chlorate.
Gene Expression Changes and Stress Responses
In simple terms: Cells turn genes on or off to cope with chlorate stress.
Exposure to chlorate triggers changes in gene expression, including upregulation of stress response genes and metabolic enzymes. In E. coli, methionine oxidation under anaerobic conditions may be part of a broader stress response that could intersect with chlorate exposure. In barley, chlorate treatment has been used to identify genes associated with nitrogen use efficiency, indicating transcriptional responses.
Physiological and Behavioral Responses
In simple terms: Organisms may move or change their behavior to avoid or use chlorate.
Dissimilatory perchlorate-reducing bacteria exhibit behavioral responses to different electron acceptors, including chlorate, by altering their movement or metabolic activity. In animals, chlorate salts can cause methemoglobin formation and other toxic responses, reflecting systemic physiological changes.
Resistance and Detoxification Mechanisms
In simple terms: Some microbes can defend themselves against chlorate.
Pseudomonas aeruginosa possesses mechanisms of chlorate resistance, including potential efflux pumps or enzymatic detoxification. In some bacteria, chlorate can be used as a terminal electron acceptor in anaerobic respiration, leading to its reduction and removal. These resistance mechanisms are part of the response to chlorate.
Key Genes Involved in GO:0010157 response to chlorate
The following genes and proteins have been implicated in response to chlorate or related processes based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NarG | Nitrate reductase subunit that can reduce chlorate to chlorite | Studied in Pseudomonas aeruginosa for chlorate toxicity |
| NarH | Nitrate reductase subunit | Part of the chlorate reduction pathway |
| NarJ | Nitrate reductase assembly chaperone | Affects chlorate reduction capacity |
| NarI | Nitrate reductase subunit | Involved in chlorate reduction |
| NarK | Nitrate transporter | May mediate chlorate uptake |
| NRT1.1 | Nitrate transporter | Homologs may transport chlorate in plants |
| NIA1 | Nitrate reductase | Reduces chlorate to chlorite in plants |
| NIA2 | Nitrate reductase | Reduces chlorate to chlorite in plants |
| NIR | Nitrite reductase | Downstream of nitrate reduction, may be affected by chlorate |
| GLN1 | Glutamine synthetase | Nitrogen assimilation, potential target of chlorate effects |
| GDH1 | Glutamate dehydrogenase | Nitrogen metabolism, may respond to chlorate |
| DmsA | Dimethyl sulfoxide reductase | Can reduce chlorate in some bacteria |
| DmsB | Dimethyl sulfoxide reductase subunit | Involved in anaerobic respiration with chlorate |
| Cld | Chlorite dismutase | Detoxifies chlorite produced from chlorate |
| PcrA | Perchlorate reductase | Reduces chlorate and perchlorate |
| Methionine synthase | Methionine biosynthesis | Methionine oxidation under anaerobic conditions may relate to chlorate stress |
| MsrA | Methionine sulfoxide reductase | Repairs oxidized methionine, potential role in chlorate stress |
| MsrB | Methionine sulfoxide reductase | Repairs oxidized methionine |
How Is response to chlorate Regulated?
The response to chlorate is regulated at multiple levels. In bacteria, nitrate reductase gene expression is controlled by nitrate and oxygen availability, affecting chlorate reduction capacity. In plants, nitrate transporters and assimilatory enzymes are regulated by nitrogen status and environmental factors, influencing chlorate sensitivity. In animals, chlorate metabolism and toxicity may be modulated by diet and physiological state. However, specific regulatory pathways for GO:0010157 are not fully defined in the literature.
response to chlorate and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NarG | Chlorate toxicity in Pseudomonas aeruginosa | KO mutant in P. aeruginosa, chlorate sensitivity assay |
| NIA1 | Nitrate assimilation and chlorate sensitivity in plants | Arabidopsis nia1 mutant, chlorate treatment |
| NIA2 | Nitrate assimilation and chlorate sensitivity | Barley nia2 mutant, chlorate screening |
| Cld | Chlorite detoxification | KO in perchlorate-reducing bacteria, chlorate growth |
| MsrA | Oxidative stress response | E. coli msrA mutant, anaerobic chlorate exposure |
Chlorate Toxicity and Methemoglobinemia
Chlorate salts can cause methemoglobinemia in animals and humans by oxidizing hemoglobin, leading to impaired oxygen transport. This toxic response is a direct consequence of chlorate exposure and is relevant to food safety and occupational health.
Thyroid Dysfunction
Chlorate is a known thyroid inhibitor, as it competes with iodide uptake by the sodium-iodide symporter. Prolonged exposure may lead to thyroid dysfunction, although studies in animals show variable effects.
Microbial Infections and Chlorate Resistance
In Pseudomonas aeruginosa, chlorate resistance mechanisms may contribute to survival in hostile environments, including those encountered during infection. Understanding these mechanisms could inform antimicrobial strategies.
Environmental Impact on Algae and Fungi
Chlorate and chlorite are toxic to algae, bacteria, and fungi, potentially disrupting ecosystems. This has implications for water quality and agricultural runoff.
From response to chlorate-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X mediate chlorate uptake? | Knockout of candidate transporter in plant or bacteria, chlorate sensitivity assay |
| Does point mutation in nitrate reductase alter chlorate reduction? | Point-mutation knock-in in NIA1/NIA2, enzyme activity assay |
| Can overexpression of chlorite dismutase confer chlorate resistance? | Overexpression of Cld in E. coli or P. aeruginosa, growth with chlorate |
| What is the subcellular localization of chlorate-induced proteins? | Tagged knock-in of candidate genes, fluorescence microscopy |
| Does chlorate exposure alter global gene expression? | RNA-seq of wild-type and mutant cells treated with chlorate |
| Can CRISPR library screening identify chlorate resistance genes? | Genome-wide CRISPR knockout library in P. aeruginosa, chlorate selection |
How to Study the response to chlorate Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Chlorate sensitivity assay | Growth inhibition by chlorate | Screening for nitrate assimilation mutants |
| RNA-seq | Global gene expression changes | Identifying chlorate-responsive genes |
| Proteomics | Protein abundance and modifications | Detecting methionine oxidation under chlorate stress |
| Nitrate reductase activity assay | Enzyme reduction of chlorate to chlorite | Characterizing chlorate reduction capacity |
| CRISPR library screening | Gene essentiality or resistance under chlorate | Identifying chlorate resistance genes |
| Fluorescence microscopy | Localization of tagged proteins | Visualizing chlorate-induced protein trafficking |
| Metabolomics | Metabolite changes | Measuring chlorite and other metabolites |
| Behavioral assays | Microbial movement or taxis | Studying response to electron acceptors like chlorate |
Chlorate Sensitivity Assays
Chlorate sensitivity assays involve growing cells in the presence of chlorate and measuring growth inhibition or survival. This method is widely used to screen for mutants defective in nitrate assimilation, as chlorate is reduced to toxic chlorite by nitrate reductase.
Transcriptomics (RNA-seq)
RNA-seq can reveal global changes in gene expression upon chlorate exposure, identifying genes and pathways involved in the response. This approach has been used in barley to identify candidate genes for nitrogen use efficiency using chlorate as an analogue.
Proteomics and Metabolomics
Proteomic and metabolomic analyses can detect changes in protein abundance and metabolite levels following chlorate treatment. For example, methionine oxidation under anaerobic conditions in E. coli may be monitored by proteomics.
Enzyme Activity Assays
Nitrate reductase activity assays measure the reduction of nitrate or chlorate to nitrite or chlorite, providing direct evidence of enzyme function. Such assays are used to characterize chlorate reduction in bacteria and plants.
How CRISPR Can Be Used to Study GO:0010157 response to chlorate
Knockout
CRISPR knockout can be used to delete candidate genes such as nitrate reductase subunits (e.g., NarG) or transporters to test their role in chlorate sensitivity. For example, knocking out NarG in Pseudomonas aeruginosa would likely confer chlorate resistance, as the toxic chlorite would not be produced.
Point Mutation
Point mutations can be introduced into active sites of nitrate reductase or transporters to dissect their catalytic or transport functions. For instance, mutating key residues in NIA1/NIA2 could alter chlorate reduction efficiency, providing insights into substrate specificity.
Knock-in
Knock-in of tagged versions of genes (e.g., GFP fusion) allows visualization of protein localization and dynamics during chlorate exposure. This can reveal whether proteins relocalize to specific compartments upon chlorate stress.
Overexpression
Overexpression of chlorite dismutase (Cld) or efflux pumps can confer chlorate resistance by detoxifying chlorite or exporting chlorate. This approach can validate resistance mechanisms identified in Pseudomonas aeruginosa.
How EDITGENE Supports response to chlorate Research
Researchers studying response to chlorate-related genes often need to determine whether a candidate gene is causally involved in chlorate sensitivity, reduction, or resistance. EDITGENE provides a comprehensive suite of CRISPR services to enable precise genetic modifications in a wide range of cell models, from bacteria to plant and mammalian cells.
Contact EDITGENE today to design your custom CRISPR model for response to chlorate research.
Frequently Asked Questions About response to chlorate
What is GO:0010157 response to chlorate?
GO:0010157 is a Gene Ontology biological process term defined as any process that results in a change in state or activity of a cell or an organism as a result of a chlorate stimulus.
What genes are involved in response to chlorate?
Genes involved include nitrate reductase subunits (NarG, NarH, NIA1, NIA2), nitrate transporters (NarK, NRT1.1), chlorite dismutase (Cld), and methionine sulfoxide reductases (MsrA, MsrB).
How is chlorate toxic to cells?
Chlorate is reduced by nitrate reductase to chlorite, which is toxic and can cause oxidative damage and methemoglobin formation.
Why is chlorate used as a nitrate analogue?
Because chlorate is structurally similar to nitrate, it is taken up by nitrate transporters and reduced by nitrate reductase, making it a useful tool to study nitrogen assimilation.
What organisms respond to chlorate?
Bacteria, algae, fungi, plants, and animals all exhibit responses to chlorate, with varying sensitivity.
How can I study response to chlorate in the lab?
Common methods include chlorate sensitivity assays, RNA-seq, proteomics, enzyme activity assays, and CRISPR screening.
What is the role of chlorite dismutase in chlorate response?
Chlorite dismutase detoxifies chlorite, the toxic product of chlorate reduction, and is important for chlorate resistance in bacteria.
Can CRISPR be used to study chlorate response?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression can be used to dissect gene function in chlorate response.
Is chlorate harmful to humans?
Chlorate salts can cause methemoglobinemia and thyroid dysfunction in animals and humans, and their use is regulated in food and water.
What are the applications of chlorate research?
Applications include improving nitrogen use efficiency in crops, bioremediation of perchlorate-contaminated sites, and food safety risk assessment.
Conclusion
GO:0010157 response to chlorate encompasses a diverse set of cellular and organismal processes triggered by chlorate exposure. From nitrate assimilation in plants to chlorate respiration in bacteria and toxicological effects in animals, this term bridges fundamental metabolism and applied research. Understanding the genes and mechanisms involved can lead to advances in agriculture, environmental remediation, and public health. EDITGENE provides the CRISPR tools and expertise to investigate these processes, enabling researchers to create precise knockout, point mutation, knock-in, and overexpression models. By combining rigorous experimental design with bioinformatics, we support the discovery of new insights into chlorate response and its applications.
References
- 1. Karunarathne SD et al.. 2021. Using chlorate as an analogue to nitrate to identify candidate genes for nitrogen use efficiency in barley.. Mol Breed 41(7):47 PMID: 37309383
- 3. Smith DJ et al.. 2012. Invited review: Efficacy, metabolism, and toxic responses to chlorate salts in food and laboratory animals.. J Anim Sci 90(11):4098-117 PMID: 22859768
- 4. Loiseau L et al.. 2022. Methionine oxidation under anaerobic conditions in Escherichia coli.. Mol Microbiol 118(4):387-402 PMID: 36271735
- 5. Sun Y et al.. 2009. Behavioral response of dissimilatory perchlorate-reducing bacteria to different electron acceptors.. Appl Microbiol Biotechnol 84(5):955-63 PMID: 19533120
- 6. Spero MA et al.. 2022. Mechanisms of chlorate toxicity and resistance in Pseudomonas aeruginosa.. Mol Microbiol 118(4):321-335 PMID: 36271736
- 7. van Wijk DJ et al.. 1998. Toxicity of chlorate and chlorite to selected species of algae, bacteria, and fungi.. Ecotoxicol Environ Saf 40(3):206-11 PMID: 9679683
- 8. Wang TJ et al.. 2024. Polar Thiazole Derivative-Induced Second Harmonic Response in Hybrid Bismuth Chlorate with Reversible Photochromism.. Inorg Chem 63(40):18955-18962 PMID: 39308097
