Evaluation of Purification Methods for Minimizing Transgene Expression Background During Viral Manufacturing

Area of Science:

• Biotechnology
• Gene Therapy
• Virology

Background:

• Viral vectors are key for gene therapy, but purification is challenging.
• Producer cell retro-transduction causes transgene contamination, especially with secreted proteins.
• This contamination reduces viral potency and therapeutic efficacy.

Purpose of the Study:

• To evaluate viral purification systems for removing transgene background.
• To assess the impact of purification on viral vector potency and functionality.
• To identify optimal methods for producing pure viral batches for gene therapy.

Main Methods:

• Systematic evaluation of common viral purification systems.
• Quantification of secreted transgene (Gaussia Luciferase - GLuc) as a contamination marker.
• Assessment of transduction efficiency and viral potency post-purification.

Main Results:

• Tangential flow filtration (TFF) demonstrated superior performance.
• TFF achieved over 90% reduction in GLuc background contamination.
• Purified viral batches using TFF showed the highest transduction efficiency rates.

Conclusions:

• Tangential flow filtration is highly effective for removing transgene background in viral vector purification.
• Optimized purification preserves viral potency and functionality, crucial for gene therapy.
• This study offers critical insights for producing high-quality viral vectors encoding secreted transgenes.