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A large-scale in vivo analysis reveals that TALENs are significantly more mutagenic than ZFNs generated using

Shijia Chen1, Grigorios Oikonomou, Cindy N Chiu

  • 1Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.

Nucleic Acids Research
|January 11, 2013
PubMed

Insights

TAL effector nucleases (TALENs) are superior to zinc-finger nucleases (ZFNs) for targeted mutagenesis in zebrafish, inducing significantly more mutations. TALENs offer greater efficiency and broader applicability for animal model research.

Area of Science:

  • Molecular Biology
  • Genetics
  • Zebrafish Model Organisms

Background:

  • Zinc-finger nucleases (ZFNs) and TAL effector nucleases (TALENs) are genome editing tools.
  • Their comparative mutagenicity in animal models requires further investigation.

Purpose of the Study:

  • To conduct a large-scale comparison of ZFN and TALEN mutagenicity in zebrafish.
  • To evaluate factors influencing nuclease efficiency and identify optimal genome editing strategies.

Main Methods:

  • Deep sequencing was employed to quantify mutations induced by ZFNs and TALENs.
  • Correlation analysis was performed between somatic and germ-line mutagenicity.
  • Predictive guidelines for target site selection were assessed for their in vivo accuracy.

Main Results:

  • TALENs demonstrated significantly higher mutagenicity, inducing approximately 10-fold more mutations than ZFNs.
  • A strong correlation was observed between somatic and germ-line mutation rates.
  • Existing guidelines for predicting nuclease target sites did not accurately predict in vivo mutagenicity.
  • CpG repeat presence negatively correlated with TALEN mutagenicity, suggesting a role for target site methylation.

Conclusions:

  • TALENs represent a superior technology for targeted mutagenesis in zebrafish due to higher mutation rates and broader target site accessibility.
  • The findings have implications for advancing genome editing applications in various animal models.

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