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Related Concept Videos

CRISPR01:59

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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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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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CIRCLE-Seq for Interrogation of Off-Target Gene Editing
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Prediction-based highly sensitive CRISPR off-target validation using target-specific DNA enrichment.

Seung-Hun Kang1,2, Wi-Jae Lee2,3, Ju-Hyun An2,4

  • 1Department of Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea.

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|July 19, 2020
PubMed
Summary
This summary is machine-generated.

CRISPR genome editing can cause unintended mutations. A new CRISPR amplification method detects these low-frequency off-target mutations with significantly higher sensitivity than existing techniques.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR-Cas systems are powerful tools for targeted genome editing.
  • Off-target mutations, arising from guide RNA (gRNA) binding to similar DNA sequences, pose a significant risk.
  • Current detection methods struggle to identify off-target mutations occurring at frequencies below 0.5%.

Purpose of the Study:

  • To develop a highly sensitive method for detecting low-frequency off-target mutations induced by genome editors.
  • To improve the safety and reliability of CRISPR-based genome editing technologies.

Main Methods:

  • Development of a novel CRISPR amplification method for detecting minute amounts of mutated DNA.
  • Induction of intracellular genome mutations using various genome editors.
  • Comparison of the CRISPR amplification method with existing targeted amplicon sequencing for off-target mutation detection.

Main Results:

  • The CRISPR amplification method demonstrated a significantly higher detection rate for off-target mutations (1.6 to 984-fold increase) compared to targeted amplicon sequencing.
  • The method effectively detects extremely small quantities of mutated DNA, overcoming limitations of current techniques.

Conclusions:

  • The developed CRISPR amplification method offers a sensitive and effective approach for detecting low-frequency off-target mutations.
  • Integration of this method with genome-wide off-target detection strategies will enhance the safety and accuracy of genome editing applications.