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A Multipurpose Toolkit to Enable Advanced Genome Engineering in Plants.

Tomáš Čermák1, Shaun J Curtin2,3, Javier Gil-Humanes1

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We developed a versatile toolkit for precise plant genome engineering using transcription activator-like effector nucleases (TALENs) and CRISPR/Cas9 systems. This platform enables efficient gene editing, knockouts, and deletions in monocots and dicots.

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Area of Science:

  • Plant Molecular Biology
  • Genome Engineering
  • Biotechnology

Background:

  • Efficient and precise genome engineering tools are crucial for plant research and crop improvement.
  • Existing methods often face limitations in multiplexing and efficiency for diverse plant species.

Purpose of the Study:

  • To develop and validate a comprehensive toolkit for targeted genome modification in monocot and dicot plants.
  • To enhance the efficiency and versatility of genome engineering through novel reagent design and delivery systems.

Main Methods:

  • Utilized transcription activator-like effector nucleases (TALENs) and CRISPR/Cas9 systems with modular cloning vectors.
  • Integrated geminivirus-based vectors for precise gene editing via homologous recombination.
  • Employed Csy4 and tRNA processing enzymes for simultaneous expression of multiple guide RNAs (gRNAs), and Trex2 exonuclease for enhanced mutagenesis.

Main Results:

  • Demonstrated efficient single or multiple gene knockouts and large chromosomal deletions.
  • Achieved targeted deletions in up to six genes by expressing 12 gRNAs from a single transcript using Csy4/tRNA systems.
  • Showcased enhanced mutagenesis (2.5-fold) with Trex2 exonuclease and comparable gene targeting frequencies with Cas9 nickases on geminivirus replicons.
  • Validated the toolkit in tomato, tobacco, Medicago truncatula, wheat, and barley.

Conclusions:

  • The developed toolkit provides a robust and efficient platform for diverse genome engineering applications in plants.
  • The novel strategies for multiplexed gRNA expression and enhanced mutagenesis significantly improve genome editing efficiency.
  • This resource facilitates accelerated functional genomics studies and crop trait development.