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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Site-specific recombinase genome engineering toolkit in maize.

Jon P Cody1, Nathaniel D Graham1, Changzeng Zhao1

  • 1Division of Biological Sciences University of Missouri Columbia MO USA.

Plant Direct
|March 14, 2020
PubMed
Summary

Five site-specific recombinase systems were successfully established in maize, demonstrating their functionality for precise genetic engineering applications like targeted integration and gene stacking.

Keywords:
Agrobacteriumbombardmentgenetic engineeringmaizerecombinases

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Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Genetics

Background:

  • Site-specific recombinases mediate precise DNA modifications (integrations, excisions, inversions) at defined binding sites.
  • These enzymes are valuable tools for genetic engineering in various organisms.
  • Establishing functional recombinase systems in diverse plant species is crucial for advanced crop improvement.

Purpose of the Study:

  • To generate stable maize lines expressing five different site-specific recombinases: Cre, R, FLPe, phiC31 Integrase, and phiC31 excisionase.
  • To confirm the functionality of these recombinases within the maize cellular environment.
  • To explore the potential of these recombinase systems for agricultural genetic engineering.

Main Methods:

  • Agrobacterium-mediated transformation was used to create stable maize lines expressing Cre, R, FLPe, phiC31 Integrase, and phiC31 excisionase.
  • Recombinase activity was assessed using transient expression assays with DsRed reporter constructs.
  • Functional validation involved observing the precise DNA manipulation mediated by each recombinase.

Main Results:

  • Five distinct stable maize expression lines for Cre, R, FLPe, phiC31 Integrase, and phiC31 excisionase were successfully generated.
  • All five recombinases demonstrated robust functionality in maize, mediating expected DNA strand-switching reactions.
  • The results confirm the applicability of these recombinases in a heterologous plant system.

Conclusions:

  • The established maize recombinase expression lines provide a powerful platform for advanced genetic engineering.
  • These systems enable precise applications such as selectable marker removal, targeted transgene insertion, and gene stacking in maize.
  • This work expands the toolkit for developing genetically modified crops with enhanced traits.