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Riboswitches

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...

Transcriptional Regulation: Riboswitches

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...

Types of RNA

Types of RNA

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...

Types of RNA

Types of RNA

Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...

Translational Regulation

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,...

Regulation of Expression Occurs at Multiple Steps

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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Related Experiment Video

Updated: Jun 17, 2026

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

Published on: May 7, 2018

Riboswitch-mediated control of gene expression in eukaryotes.

Andreas Wachter¹

¹Center for Plant Molecular Biology (ZMBP), Tübingen University, Tübingen, Germany. awachter@zmbp.unituebingen.de

|December 17, 2009

Summary

Metabolite-sensing RNA riboswitches regulate gene expression. Eukaryotic riboswitches, like those binding thiamin pyrophosphate, uniquely control splicing, showcasing RNA

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Riboswitches are metabolite-sensing RNA domains regulating gene expression, primarily in bacteria.
Over 20 riboswitch classes identified, responding to diverse small molecules.
Bacterial riboswitches typically control gene expression via transcriptional or translational attenuation in the 5' untranslated region of mRNA.

Purpose of the Study:

To explore the expanded repertoire of riboswitch regulatory mechanisms beyond bacterial attenuation.
To investigate the role and mechanism of eukaryotic riboswitches.
To highlight the versatility of RNA-based gene regulation.

Main Methods:

Literature review and synthesis of recent findings on riboswitches.
Analysis of identified riboswitch classes in different organisms.

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Nanomanipulation of Single RNA Molecules by Optical Tweezers

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Last Updated: Jun 17, 2026

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness

Published on: May 7, 2018

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Nanomanipulation of Single RNA Molecules by Optical Tweezers

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Comparative study of regulatory mechanisms across species.

Main Results:

Discovery of novel riboswitch classes with complex regulatory functions.
Identification of thiamin pyrophosphate-binding riboswitches as the sole metabolite-sensing RNAs in eukaryotes.
Eukaryotic riboswitches initiate gene regulation by modulating splicing.
Downstream regulatory processes controlled by eukaryotic riboswitches exhibit significant species-specific variations.

Conclusions:

Riboswitches demonstrate a broader range of gene regulatory functions than previously understood.
Eukaryotic riboswitches represent a unique RNA-based regulatory system primarily controlling splicing.
The diverse downstream effects of eukaryotic riboswitches underscore the adaptability and complexity of RNA-mediated gene control.