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Challenges to increasing targeting efficiency in genome engineering.

Takuro Horii1, Izuho Hatada

  • 1Laboratory of Genome Science, Biosignal Genome Resource Center, Institute for Molecular and Cellular Regulation, Gunma University, Gunma 371-8512, Japan.

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Gene targeting technologies are crucial for studying gene function. While CRISPR/Cas offers direct knockout mouse generation, homologous recombination (HR) methods using embryonic stem cells (ESCs) remain vital and are continuously improved.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioengineering

Background:

  • Gene targeting is fundamental for understanding gene function.
  • Traditional knockout mouse generation using embryonic stem cells (ESCs) is laborious and time-consuming.
  • CRISPR/Cas technology enables direct knockout mouse generation via non-homologous end joining (NHEJ).

Purpose of the Study:

  • To review current gene targeting technologies.
  • To emphasize homologous recombination (HR)-mediated gene targeting strategies.
  • To discuss the advancements and limitations of different gene targeting approaches.

Main Methods:

  • Review of existing gene targeting technologies.
  • Focus on homologous recombination (HR)-mediated strategies.
  • Comparison of CRISPR/Cas and ESC-based gene targeting.

Main Results:

  • CRISPR/Cas shows low efficiency in homologous recombination (HR) and high mosaicism.
  • ESC-based gene targeting remains a key strategy with ongoing improvements.
  • Both CRISPR/Cas and ESC-based methods are used for gene targeting.

Conclusions:

  • Homologous recombination (HR)-mediated gene targeting remains critical.
  • Continuous improvement of ESC-based methods is essential.
  • Understanding the strengths and weaknesses of each technology is key for efficient gene function analysis.