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Related Concept Videos

Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
Constitutive and Regulated Gene Expression01:27

Constitutive and Regulated Gene Expression

Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
What is Gene Expression?01:42

What is Gene Expression?

Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...

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Controlling gene expression in response to stress.

Eulàlia de Nadal1, Gustav Ammerer, Francesc Posas

  • 1Cell Signaling Unit, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain.

Nature Reviews. Genetics
|November 4, 2011
PubMed
Summary
This summary is machine-generated.

Cells rapidly adapt to acute stress through precise gene expression regulation. Organisms utilize diverse strategies across mRNA biogenesis for survival, ensuring generic and specific stress responses.

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Acute stress poses significant risks to cellular integrity and survival.
  • Cellular adaptation relies on modifying cell physiology, particularly through gene expression changes orchestrated by intracellular signaling networks.

Purpose of the Study:

  • To discuss strategies employed by organisms for rapid and specific gene expression activation in response to diverse stresses.
  • To explore the regulation of gene expression at multiple stages of mRNA biogenesis.

Main Methods:

  • Review of recent studies employing genome-wide approaches.
  • Integration of single-cell transcription measurements.
  • Consideration of classical genetics findings.

Main Results:

  • Rapid and specific gene expression activation can be achieved through various strategies.
  • Gene expression regulation occurs at multiple levels, including chromatin structure, transcription, mRNA stability, and translation.

Conclusions:

  • Organisms can mount both generic and specific responses to different stresses by modulating gene expression.
  • Understanding these regulatory mechanisms is key to cellular survival under stress conditions.