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Related Concept Videos

Translational Regulation01:29

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
Transcriptional Regulation: Riboswitches01:23

Transcriptional Regulation: Riboswitches

Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
Riboswitches01:56

Riboswitches

Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
Experimental RNAi02:15

Experimental RNAi

RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
09:39

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster

Published on: August 21, 2014

Small RNAs establish gene expression thresholds.

Erel Levine1, Terence Hwa

  • 1Center for Theoretical Biological Physics and Department of Physics, University of California at San Diego, La Jolla, CA 92093, United States. elevine@ucsd.edu

Current Opinion in Microbiology
|October 22, 2008
PubMed
Summary
This summary is machine-generated.

Small RNAs regulate bacterial gene expression by basepairing with target mRNAs. These small RNAs establish a dynamic expression threshold, complementing transcriptional control and preventing fluctuations.

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Area of Science:

  • Bacteriology
  • Molecular Biology
  • Gene Regulation

Background:

  • Small RNAs (sRNAs) are key regulators of bacterial gene expression.
  • sRNAs typically function by basepairing with target messenger RNAs (mRNAs).
  • This interaction modulates translation initiation and mRNA stability.

Purpose of the Study:

  • To elucidate the central role of small RNAs in bacterial gene regulation.
  • To understand the unique features of sRNA-mediated regulation.
  • To explore how sRNA regulation complements transcriptional control.

Main Methods:

  • Quantitative studies on sRNA regulatory mechanisms.
  • Analysis of sRNA-mRNA interactions.
  • Investigating the establishment of expression thresholds.

Main Results:

  • Small RNA regulation establishes a threshold for target gene expression.
  • This threshold acts as a safety mechanism against expression fluctuations.
  • The threshold level is determined by the sRNA transcription rate.

Conclusions:

  • Small RNA regulation provides a robust layer of control complementing transcriptional regulation.
  • The dynamic threshold set by sRNAs allows bacteria to respond to environmental changes.
  • Understanding sRNA function is crucial for deciphering bacterial adaptive strategies.