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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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COSMID: A Web-based Tool for Identifying and Validating CRISPR/Cas Off-target Sites.

Thomas J Cradick1, Peng Qiu1, Ciaran M Lee1

  • 1Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, USA.

Molecular Therapy. Nucleic Acids
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CRISPR/Cas genome editing can cause unintended DNA changes. A new tool, COSMID, identifies potential off-target sites by searching for mismatches, insertions, and deletions, improving CRISPR system design and safety.

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Area of Science:

  • Molecular Biology
  • Bioinformatics
  • Genomics

Background:

  • Engineered nucleases, particularly CRISPR/Cas systems, offer precise genome editing capabilities for research and therapeutics.
  • CRISPR/Cas systems, while powerful, can exhibit off-target cleavage at genomic sites with sequence similarities to the guide RNA, including mismatches, insertions, or deletions.
  • Minimizing off-target effects is crucial for the safe and effective application of CRISPR/Cas technology.

Purpose of the Study:

  • To develop a bioinformatics tool to identify potential off-target cleavage sites for CRISPR/Cas genome editing systems.
  • To aid researchers in designing more specific guide RNAs and evaluating potential target sites.
  • To facilitate the detection and quantification of unintended CRISPR/Cas-induced mutations.

Main Methods:

  • Development of a bioinformatics tool named COSMID (CRISPR Off-target Sites with Mismatches, Insertions, and Deletions).
  • COSMID analyzes user-supplied guide strands and input parameters to search genomes for potential off-target sites.
  • The tool identifies sites with specified numbers of mismatched bases, insertions, or deletions relative to the guide strand and provides optimal amplification primers.

Main Results:

  • COSMID successfully identifies potential off-target sites based on user-defined criteria for mismatches, insertions, and deletions.
  • The tool provides a ranked list of potential off-target sites, aiding in the selection of optimal target sites.
  • Output includes primer recommendations for analyzing identified off-target locations.

Conclusions:

  • COSMID is a valuable bioinformatics resource for designing CRISPR/Cas systems with reduced off-target effects.
  • The tool assists in the crucial evaluation of intended target sites, enhancing genome editing specificity.
  • COSMID supports the identification and quantification of off-target cleavage events in cellular contexts.