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Related Concept Videos

CRISPR/Cas9 Genome Editing01:28

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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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High-efficiency CRISPR/Cas9 multiplex gene editing using the glycine tRNA-processing system-based strategy in maize.

Weiwei Qi1,2, Tong Zhu1, Zhongrui Tian1

  • 1Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 333 Nanchen Road, Shanghai, 200444, China.

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Summary

Researchers optimized CRISPR/Cas9 multiplex gene editing in maize using a tRNA-processing system. This strategy enhances gene editing efficiency and targets multiple sites simultaneously for improved maize research and breeding.

Keywords:
CRISPR/Cas9MaizeMultiplex gene editingtRNA-processing

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Area of Science:

  • Plant biotechnology
  • Genome editing
  • Molecular biology

Background:

  • CRISPR/Cas9 technology enables genome editing across species.
  • tRNA-processing systems can compact multiple guide RNAs (gRNAs) for gene manipulation.

Purpose of the Study:

  • To optimize and implement a multiplex gene editing strategy using tRNA processing in maize.
  • To enhance the efficiency and scope of genome editing in maize.

Main Methods:

  • Designed multiple tRNA-gRNA units using maize glycine-tRNA for simultaneous gRNA production.
  • Utilized a single maize U6 promoter to drive multiple gRNAs.
  • Developed simplex and multiplex editing systems with three gRNAs each.
  • Investigated the efficacy of up to four tRNA-gRNA units in one expression cassette.

Main Results:

  • The tRNA-processing system successfully enabled multiplex gene editing in maize.
  • Increased the number of targeted sites and enhanced mutagenesis efficiency.
  • Demonstrated the functionality of up to four tRNA-gRNA units in a single cassette.
  • Proposed advanced gRNA spacer selection for efficient chromosomal fragment deletion, crucial for long non-coding RNA (lncRNA) function abolishment.

Conclusions:

  • The tRNA-processing system is an effective multiplex genome editing tool for maize.
  • This strategy significantly enhances maize genetic research and breeding applications.