Production, Purification, and Quality Control for Adeno-associated Virus-based Vectors

Area of Science:

• Molecular Biology
• Neuroscience
• Gene Therapy

Background:

• Adeno-associated viruses (AAVs) are key tools for central nervous system (CNS) gene delivery and therapy.
• Existing AAV production methods require optimization for purity and titer for in vivo applications.
• Specific AAV serotypes, like PHP.B, demonstrate potential for crossing the blood-brain-barrier (BBB) after systemic delivery.

Purpose of the Study:

• To describe an efficient and reproducible protocol for adeno-associated virus (AAV) vector production.
• To optimize AAV vector purification for high titer and purity suitable for in vivo studies.
• To present a method for accurate AAV vector titration and purity assessment.

Main Methods:

• Implementation of an iodixanol gradient purification strategy for AAV vector production.
• Utilized quantitative polymerase chain reaction (qPCR) for rapid and accurate vector titer determination.
• Employed silver staining to assess the purity of the produced AAV vector batches.

Main Results:

• The iodixanol purification method yields high-titer and high-purity AAV vectors compared to other techniques.
• This protocol is faster than currently described AAV purification methods.
• Demonstrated successful gene delivery to the CNS using systemically administered AAV-PHP.B vectors.

Conclusions:

• The described iodixanol-based protocol provides an efficient and reproducible method for AAV vector production.
• The protocol facilitates the generation of high-quality AAV vectors suitable for CNS gene therapy research.
• The presented methods for titration and purity assessment ensure reliable vector characterization.