Standard screening methods underreport AAV-mediated transduction and gene editing.

Area of Science:

• Biotechnology
• Molecular Biology
• Gene Therapy

Background:

• Traditional adeno-associated virus (AAV) tropism studies rely on high reporter gene expression, overlooking transient or low-level transduction.
• This limitation creates a blind spot for AAV-based genome editing, which requires minimal transgene expression for efficacy.

Purpose of the Study:

• To develop a sensitive method for detecting the complete spectrum of AAV vector transduction patterns in vivo.
• To identify previously unknown AAV target sites and improve prediction of gene editing outcomes.

Main Methods:

• Utilized novel editing-reporter mice to capture both high and low transgene expression from AAV vectors.
• Conducted side-by-side comparisons of the new method with conventional techniques using AAV8 and other serotypes.

Main Results:

• The editing-reporter mouse system demonstrated superior sensitivity in detecting AAV transduction compared to traditional methods.
• Identified numerous novel sites of AAV targeting across various serotypes.
• Showed improved prediction of gene editing efficiency following AAV-CRISPR delivery.

Conclusions:

• The developed editing-reporter system comprehensively captures AAV transduction patterns, addressing limitations of prior methods.
• This approach is foundational for advancing current and future adeno-associated virus technologies, particularly in genome editing.
• The findings expand the understanding of AAV tropism and enhance the precision of gene editing applications.