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Updated: Dec 21, 2025

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Rewired Cas9s with Minimal Sequence Constraints.

Sébastien Levesque1, Daniel Agudelo1, Yannick Doyon1

  • 1Centre Hospitalier Universitaire de Québec Research Center-Université Laval, Québec, QC G1V 4G2, Canada.

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|May 18, 2020
PubMed
Summary
This summary is machine-generated.

Researchers engineered CRISPR-Cas systems for precise gene editing, overcoming limitations in single-nucleotide resolution. This advancement expands the genome editing toolkit by enabling targeting of all protospacer adjacent motifs (PAMs).

Keywords:
CRISPR-Cas9genome editingprotospacer adjacent motifs

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR-Cas systems are powerful genome editing tools.
  • Current systems have limitations in targeting specific DNA sequences, particularly achieving single-nucleotide resolution.
  • The protospacer adjacent motif (PAM) is a critical factor in CRISPR-Cas targeting specificity.

Purpose of the Study:

  • To engineer novel nucleases and base editors for CRISPR-Cas systems.
  • To achieve high-precision, single-nucleotide resolution in genome editing.
  • To overcome protospacer adjacent motif (PAM) limitations in current CRISPR-Cas systems.

Main Methods:

  • Engineering of Cas9 nucleases and base editors.
  • Testing compatibility with diverse protospacer adjacent motifs (PAMs).
  • Evaluation of targeting precision at the single-nucleotide level.

Main Results:

  • Development of CRISPR-Cas variants with broad PAM compatibility.
  • Demonstration of high-precision genome editing, including single-nucleotide targeting.
  • Unveiling the plasticity of the Cas9 enzyme in accommodating new PAM specificities.

Conclusions:

  • The engineered CRISPR-Cas systems significantly enhance genome editing precision.
  • These advancements overcome previous PAM limitations, expanding targeting capabilities.
  • The findings highlight the adaptability of Cas9 for future genome engineering applications.