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Transient Gene Expression in Tobacco using Gibson Assembly and the Gene Gun
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Published on: April 18, 2014

In planta gene targeting.

Friedrich Fauser1, Nadine Roth, Michael Pacher

  • 1Botany II, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|April 25, 2012
PubMed
Summary
This summary is machine-generated.

A new gene targeting (GT) system enables efficient genetic modification in all transformable plants, overcoming previous species limitations. This method allows direct recovery of targeted alleles from seeds, simplifying plant genetic engineering.

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Area of Science:

  • Plant biotechnology
  • Molecular biology
  • Genetics

Background:

  • Site-specific endonucleases have advanced gene targeting (GT) in various species.
  • Existing plant GT methods necessitate efficient transformation and regeneration, limiting their application to few species.

Purpose of the Study:

  • To develop a highly efficient and broadly applicable gene targeting system for plants.
  • To overcome the limitations of transformation efficiency in plant genetic engineering.

Main Methods:

  • Expression of a site-specific endonuclease in Arabidopsis thaliana to induce targeted DNA cutting.
  • Design of an endonuclease that excises the targeting vector after cutting the chromosomal transgenic donor.
  • Direct recovery of targeted alleles from progeny seeds.

Main Results:

  • Achieved highly efficient in planta gene targeting in Arabidopsis thaliana.
  • Demonstrated successful excision of the targeting vector via homologous recombination at both ends of the induced break.
  • Identified targeted events at a frequency of approximately one per 100 seeds.
  • Confirmed no ectopic integration of the gene targeting vector.

Conclusions:

  • The developed gene targeting system is efficient and suitable for all transformable plants, irrespective of transformation efficiency.
  • This method simplifies the process of obtaining genetically modified plants with targeted alleles.
  • The system shows high fidelity with homologous recombination and no off-target vector integration.