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Related Experiment Video

Updated: Jul 18, 2025

Potato Virus X-Based microRNA Silencing VbMS In Potato.
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Cas13a-based multiplex RNA targeting for potato virus Y.

Xiaohui Zhan1, Zhen Tu2, Wenlei Song1

  • 1State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei Hongshan Laboratory, Hubei University, Wuhan, 430062, China.

Planta
|August 24, 2023
PubMed
Summary

Engineered CRISPR-Cas13a systems can protect plants from RNA viruses like potato virus Y. The number and expression of guide RNAs do not significantly impact this viral interference, offering a robust strategy for crop protection.

Keywords:
Cas13aGuide RNAMultiplex RNA targetingPotato virus YResistance

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Area of Science:

  • Plant pathology
  • Molecular biology
  • Biotechnology

Background:

  • CRISPR-Cas systems provide adaptive immunity in bacteria and archaea.
  • The CRISPR-Cas13a effector has been used to protect eukaryotic species from RNA viruses.
  • The impact of guide RNA (gRNA) quantity and expression on Cas13a-mediated viral inhibition was previously unknown.

Purpose of the Study:

  • To investigate the efficacy of a CRISPR-Cas13a system for potato virus Y (PVY) resistance in plants.
  • To determine if the number and expression levels of guide RNAs affect PVY inhibition by Cas13a.
  • To explore the use of a polycistronic tRNA-gRNA expression system for multiplex RNA targeting.

Main Methods:

  • Cas13a and multiple guide RNAs (gRNAs) targeting four PVY genes were expressed in potato plants.
  • A polycistronic tRNA-gRNA system was utilized for multiplex RNA targeting.
  • Transgenic potato lines were challenged with PVY to assess resistance and viral accumulation.

Main Results:

  • Transgenic potato plants expressing multiple gRNAs showed similar PVY suppression and reduced disease symptoms compared to plants with a single gRNA.
  • Varying expression levels of multiple gRNAs did not significantly alter the resistance of transformed plants to PVY.
  • Cas13a-mediated viral interference was effective regardless of the number or expression levels of gRNAs.

Conclusions:

  • The Cas13a-based multiplex RNA targeting system can be engineered for RNA virus resistance in plants.
  • The number and expression levels of gRNAs have no significant effect on CRISPR/Cas13a-mediated viral interference.
  • This study validates a robust strategy for engineering plant resistance to RNA viruses using CRISPR/Cas13a technology.