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A versatile reporter system for CRISPR-mediated chromosomal rearrangements

Yingxiang Li1, Angela I Park2, Haiwei Mou3

  • 1Department of Bioinformatics, School of Life Science and Technology, Tongji University, Shanghai, P. R. China. xlccalyx@gmail.com.

Genome Biology
|May 29, 2015
PubMed

Insights

Researchers developed fluorescent reporters to quickly detect DNA deletions and inversions using CRISPR/Cas9 technology. This method revealed new insights into DNA repair mechanisms and Cas9 enzyme activity, aiding cancer research.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Chromosomal deletions and inversions are significant in cancer development.
  • Traditional methods for detecting DNA rearrangements are time-consuming and indirect.

Purpose of the Study:

  • To develop rapid fluorescent reporters for quantifying CRISPR/Cas9-mediated DNA deletions and inversions.
  • To investigate the mechanisms underlying these chromosomal rearrangements.

Main Methods:

  • Development of fluorescent reporters for CRISPR/Cas9.
  • Quantification of deletions and inversions in mouse liver using engineered reporters.
  • Analysis of DNA repair pathways, specifically non-homologous end-joining (NHEJ).
  • Characterization of Cas9 cleavage patterns and resulting DNA breaks.

Main Results:

  • CRISPR/Cas9-mediated inversions were found to depend on the LIG4 enzyme.
  • Deletions and inversions were successfully engineered in a 50 kb Pten genomic region.
  • Sequence-specific insertions/deletions (indels) were observed at rearrangement fusion sites.
  • Cas9 cleavage was detected at the fourth nucleotide, causing staggered DNA breaks.

Conclusions:

  • The developed fluorescent reporters enable rapid quantification of CRISPR/Cas9-induced chromosomal rearrangements.
  • The study elucidates the role of LIG4 in inversion formation and provides insights into Cas9 cleavage mechanisms.
  • This technology facilitates further investigation into the mechanisms of chromosomal rearrangements.

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