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Oligo-seq protocol for mapping DNA motifs targeted by base editors.

Pedro Ortega1, Ambrocio Sanchez1, Marcus Seldin1

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Oligo-seq identifies DNA sequences preferred by base editors like APOBECs and AID. This sequencing assay helps understand and improve DNA editing efficiency in research and therapeutic applications.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Base editors, including APOBECs, AID, and CRISPR-Cas9 systems, are crucial for DNA editing.
  • Understanding their preferred DNA targets is essential for optimizing editing efficiency and comprehending cellular mechanisms.
  • Current methods may not fully capture the sequence specificities of these enzymes.

Purpose of the Study:

  • To develop and validate a novel in vitro sequencing-based method, Oligo-seq, for identifying preferred DNA sequence motifs targeted by base editors.
  • To provide a tool for detailed analysis of DNA deaminase activity on various DNA substrates.

Main Methods:

  • Oligo-seq assay utilizes DNA oligonucleotides with random nucleotides and/or DNA structures.
  • DNA deaminase activity is monitored on these oligonucleotides.
  • Sequencing determines which DNA sequences are preferentially deaminated by the enzymes.

Main Results:

  • The Oligo-seq method successfully identifies specific sequence motifs targeted by base editors.
  • The assay demonstrates the ability to monitor DNA deaminase activity on diverse DNA substrates.
  • This provides a quantitative measure of sequence preference for various base editing enzymes.

Conclusions:

  • Oligo-seq is an effective sequencing-based assay for determining base editor DNA sequence preferences.
  • This method facilitates a deeper understanding of DNA editing mechanisms.
  • Oligo-seq can be instrumental in improving the efficiency and specificity of base editing tools for research and therapeutic purposes.