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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.
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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...
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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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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...
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Dynamic signal processing by ribozyme-mediated RNA circuits to control gene expression.

Shensi Shen1, Guillermo Rodrigo1, Satya Prakash2

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Scientists engineered synthetic RNA signaling cascades to process signals in live cells. This breakthrough enables the de novo design of complex gene circuits for synthetic biology applications.

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Area of Science:

  • Synthetic biology
  • Molecular biology
  • Biochemistry

Background:

  • Organisms utilize complex genetic circuitries to translate molecular signals into gene expression changes.
  • Designing synthetic RNA modules for dynamic signal processing in live cells presents a significant challenge in synthetic biology.
  • A scalable methodology for sensing, signal transmission, and actuation is crucial for assembling larger synthetic signaling networks.

Purpose of the Study:

  • To present a biochemical strategy for designing RNA-mediated signal transduction cascades.
  • To develop synthetic RNA systems capable of sensing small molecules and small RNAs.
  • To engineer novel RNA modules for dynamic signal processing and gene expression regulation in live cells.

Main Methods:

  • Utilized strand-displacement techniques to design switchable functional RNA domains.
  • Developed RNA-mediated signal transduction cascades for sensing and processing molecular signals.
  • Integrated RNA-RNA interactions with existing ribozyme and aptamer elements.
  • Experimentally characterized the molecular mechanisms of synthetic RNA signaling cascades.

Main Results:

  • Demonstrated the ability to regulate gene expression using transduced RNA signals.
  • Characterized the signal processing response of engineered systems to periodic forcing in single live cells.
  • Successfully designed and implemented synthetic RNA signaling cascades capable of sensing small molecules and small RNAs.

Conclusions:

  • The developed biochemical strategy enables the de novo design of RNA-mediated signal transduction cascades.
  • Engineered RNA systems can effectively process signals and regulate gene expression in live cells.
  • These advancements offer new possibilities for engineering complex gene circuits by integrating RNA-RNA interactions with ribozymes and aptamers.