Emerging tools in plant genome editing.

Area of Science:

• Plant molecular biology and genetics
• Genome engineering and synthetic biology

Background:

• Classical genome editing tools like ZFNs, TALENs, and CRISPR-Cas9 enabled targeted mutagenesis but relied on double-strand breaks (DSBs).
• The field is rapidly evolving with novel systems offering greater precision, flexibility, and efficiency in genetic material modification.

Purpose of the Study:

• To review advanced and recent plant genome editing tools beyond conventional DSB-mediated approaches.
• To highlight the potential of these new technologies for precise DNA and RNA modulation, including DSB-free editing and base substitutions.
• To discuss the implications for developing adaptive crops tailored to future environmental and nutritional challenges.

Main Methods:

• Exploration of novel genome and transcriptome modulation systems including LEAPER, SATI, RESTORE, RESCUE, ARCUT, SPARDA, HACE, Type IV-A CRISPR, TATSI, and piggyBac.
• Focus on DSB-free DNA editing (SATI), RNA editing (LEAPER, RESTORE, RESCUE), chemically-guided editing (ARCUT, SPARDA), and transposon-based techniques (TATSI, piggyBac).
• Analysis of helicase-based (HACE) and prokaryotic Argonaute protein-based (SPARDA) approaches.

Main Results:

• Emergence of tools enabling DSB-free DNA editing, precise base substitutions, and RNA editing without genomic alteration.
• Development of systems like ARCUT for cleaner DNA repair with reduced off-target effects and Type IV-A CRISPR for gene silencing.
• RNA editing tools (RESTORE, LEAPER) offer transient, reversible control, akin to epigenetics, for responsive trait expression.

Conclusions:

• Advanced genome editing tools offer unprecedented precision and flexibility, moving beyond DSB-mediated approaches.
• These innovations facilitate gene function studies, synthetic pathway design, and trait stacking, paving the way for intelligent crop design.
• The potential for developing climate-resilient crops is significant, though many tools require further application in plant systems.