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What is Genetic Engineering?00:49

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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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CRISPR off-target analysis in genetically engineered rats and mice.

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CRISPR genome editing can cause unintended mutations. This study found that high-fidelity Cas9 versions significantly reduced Cas9-mediated off-target mutations in mouse and rat models, improving editing precision.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioengineering

Background:

  • CRISPR-Cas9 technology is widely used for genome editing.
  • However, data on Cas9-mediated off-target mutation frequency and impact in modified rodents are limited.
  • Understanding and minimizing off-target effects is crucial for safe and effective gene editing applications.

Purpose of the Study:

  • To comprehensively assess the frequency and impact of Cas9-mediated off-target mutations in mouse and rat genomes.
  • To evaluate the efficacy of high-fidelity Cas9 versions in reducing in vivo off-target mutations.
  • To validate prediction tools for off-target sites.

Main Methods:

  • Deep sequencing of 81 genome-editing projects across mouse and rat genomes.
  • Analysis of 1,423 predicted off-target sites.
  • Whole-genome sequencing of ten mouse embryos and their genetic parents.
  • Comparison of off-target mutations with predictions from an adapted GUIDE-seq method.

Main Results:

  • 32 confirmed off-target mutations were identified across 1,423 predicted sites.
  • High-fidelity Cas9 versions demonstrated reduced in vivo off-target mutation rates.
  • 43 off-target mutations were found in mouse embryos, with 30 accurately predicted by the adapted GUIDE-seq tool.

Conclusions:

  • Cas9-mediated off-target mutations occur in rodents, but their frequency can be reduced using high-fidelity Cas9 variants.
  • The adapted GUIDE-seq method shows promise for predicting off-target sites in genome editing.
  • These findings contribute to enhancing the safety and precision of CRISPR-based genome engineering in preclinical models.