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Related Concept Videos

CRISPR/Cas9 Genome Editing01:28

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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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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-Cas9-Mediated Precise Knock-In Edits in Zebrafish Hearts
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An improved method for precise genome editing in zebrafish using CRISPR-Cas9 technique.

Eugene V Gasanov1, Justyna Jędrychowska2,3, Michal Pastor2,4

  • 1International Institute of Molecular and Cell Biology in Warsaw, Ks. Trojdena Str. 4, 02-109, Warsaw, Poland. egasanov@iimcb.gov.pl.

Molecular Biology Reports
|January 22, 2021
PubMed
Summary

This study introduces a novel CRISPR-Cas9 genome editing technique using two guide RNAs (gRNAs) to precisely delete DNA sequences. This enhanced method improves specificity and reduces unwanted mutations in zebrafish gene editing.

Keywords:
CRISPR-Cas9HRMPrecise deletion editingZebrafishgRNAs

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Area of Science:

  • Genetics
  • Molecular Biology
  • Zebrafish Model Organisms

Background:

  • CRISPR-Cas9 gene editing typically uses single guide RNAs (gRNAs) leading to imprecise DNA repair via non-homologous end-joining.
  • This imprecision can result in unwanted deletions and insertions at the target site, limiting predictable mutagenesis.

Purpose of the Study:

  • To develop an improved CRISPR-Cas9 genome editing system utilizing two complementary guide RNAs (gRNAs) for precise deletion of target DNA sequences.
  • To demonstrate the efficacy and specificity of this dual-gRNA system in generating targeted mutations in zebrafish.

Main Methods:

  • Developed a CRISPR-Cas9 system employing two complementary gRNAs to define and delete specific nucleotide segments at the target locus.
  • Applied the dual-gRNA method to generate heterozygous deletion mutants for the kcng4b, gdap1, and ghitm genes in zebrafish (Danio rerio).
  • Utilized high-resolution DNA melting analysis to assess mutation efficiency and detect off-target mutations.

Main Results:

  • Successfully generated precise deletion mutants in target genes (kcng4b, gdap1, ghitm) in zebrafish using the dual-gRNA CRISPR-Cas9 system.
  • High-resolution DNA melting analysis confirmed high editing efficiency and a low frequency of unintended mutations.
  • The dual-gRNA approach demonstrated enhanced specificity compared to conventional single-gRNA methods.

Conclusions:

  • The proposed dual-gRNA CRISPR-Cas9 system significantly enhances genome editing specificity and predictability.
  • This method enables the precise deletion of nucleotides, offering a more controlled approach to site-specific mutagenesis in zebrafish.
  • This improved technique holds potential for generating accurate genetic models for research in Danio rerio and potentially other organisms.