Engineering Cas9: next generation of genomic editors

Area of Science:

• Molecular Biology
• Biotechnology
• Gene Editing Technologies

Background:

• The Cas9 endonuclease from Streptococcus pyogenes is central to CRISPR-Cas genome editing.
• Despite limitations, it's the most utilized tool for genetic therapies.
• Ongoing research focuses on enhancing Cas9 for improved therapeutic outcomes.

Purpose of the Study:

• To review recent advancements in developing next-generation Cas9 genome editors.
• To discuss strategies for improving Cas9's efficacy, specificity, and safety.
• To highlight progress in creating enhanced Cas9 variants for therapeutic use.

Main Methods:

• Directed evolution of the Cas9 protein.
• Rational design and domain swapping of Cas9.
• Combining and refining mutations from first-generation Cas9 variants.

Main Results:

• Next-generation Cas9 editors exhibit higher activity compared to initial versions.
• PAM-relaxed Cas9 variants demonstrate improved specificity and activity.
• New Cas9 variants show reduced mutagenicity and immunogenicity.

Conclusions:

• Significant progress has been made in creating advanced Cas9 genome editors.
• These next-generation editors offer improved performance and safety profiles.
• Further development of Cas9 variants holds promise for human genetic and viral disease treatments.