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Enhancing HR Frequency for Precise Genome Editing in Plants.

Hao Chen1,2, Matthew Neubauer1, Jack P Wang3,4

  • 1Department of Plant and Microbial Biology, Program in Genetics, North Carolina State University, Raleigh, NC, United States.

Frontiers in Plant Science
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Summary

Enhancing homology-directed repair (HDR) is key for precise plant genome engineering. This review explores strategies to boost HDR frequency, overcoming limitations of non-homologous end joining (NHEJ) for accurate gene editing in plants.

Keywords:
donor templategene targetinghomologous recombinationhomology-directed repairprogrammable nucleases

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Area of Science:

  • Plant biotechnology
  • Molecular biology
  • Genetics

Background:

  • Gene editing in plants relies on DNA repair pathways: non-homologous end joining (NHEJ) and homologous recombination (HR).
  • NHEJ is prevalent in plants but often causes unpredictable mutations, hindering precise genetic modification.
  • Homology-directed repair (HDR) offers precise editing via donor templates but occurs at low frequencies in plants.

Purpose of the Study:

  • To review strategies for increasing the frequency of homology-directed repair (HDR) in plant cells.
  • To address the challenge of low native HR rates in plants for efficient genome engineering.
  • To provide insights into optimizing gene editing outcomes in plants.

Main Methods:

  • Targeting double-strand DNA breaks to specific genomic locations.
  • Optimizing the design and delivery of donor DNA sequences for HDR.
  • Modifying plant DNA repair pathways and machinery to favor HR.
  • Investigating environmental factors that influence HR frequency in plants.

Main Results:

  • Various strategies have been developed to enhance HDR efficiency in plants.
  • Methods focus on improving DNA break induction, donor template utilization, and repair pathway modulation.
  • Environmental factors can also play a role in modulating HR rates.

Conclusions:

  • Increasing HDR frequency is crucial for advancing plant genome engineering.
  • Refined strategies hold promise for making HR-based gene editing a routine tool in plant science.
  • Further research can lead to more predictable and efficient gene editing in diverse plant species.