Targeted exon skipping with AAV-mediated split adenine base editors

Area of Science:

• Molecular Biology
• Gene Therapy
• Biotechnology

Background:

• Exon skipping is a gene therapy technique used to treat various diseases.
• Current methods for exon skipping often have transient effects, necessitating the development of permanent solutions.
• Cytidine base editors have previously shown potential for permanent exon skipping.

Purpose of the Study:

• To demonstrate the application of CRISPR-Cas9 adenine deaminase base editors for programmable exon skipping.
• To enhance DNA editing efficiency and exon-skipping rates.
• To develop a base editor system suitable for in vivo gene therapy applications.

Main Methods:

• Utilized CRISPR-Cas9 adenine deaminase base editors to target and disrupt adenine within splice acceptor sites.
• Optimized base editor components, including linker amino acid sequences and uracil glycosylase inhibitor coupling.
• Developed a split base editor architecture for adeno-associated viral packaging.

Main Results:

• Successfully demonstrated programmable exon skipping using adenine base editors.
• Achieved significant improvements in DNA editing efficiency and exon-skipping rates through optimization strategies.
• Developed a split base editor compatible with adeno-associated viral delivery systems.

Conclusions:

• CRISPR-Cas9 adenine base editing offers a viable strategy for permanent exon skipping.
• Optimized base editor designs enhance efficiency for therapeutic applications.
• This advancement represents significant progress toward in vivo gene therapy for genetic diseases.