Enhancing AAV Manufacturing Yield Through A Promoter-Optimized Mini-Helper Plasmid

Adeno-associated virus (AAV) has emerged as a leading in vivo gene delivery platform for gene therapy because of its non-pathogenic nature and ability to achieve long-term transgene expression across a wide range of tissues. Conventional AAV manufacturing relies on transient triple-plasmid transfection in mammalian cells using three genetic components: a cis plasmid carrying the therapeutic transgene flanked by inverted terminal repeats (ITRs), a trans plasmid encoding the AAV rep/cap genes, and an adenoviral helper plasmid that provides the helper functions required for AAV replication and capsid assembly. However, conventional helper plasmids contain substantial non-essential sequences that increase plasmid size, elevate DNA synthesis costs, and may reduce transfection efficiency.

To overcome these limitations, Samsung Biologics developed a promoter-optimized mini-helper plasmid that retains only the essential adenoviral helper genes while incorporating optimized promoters to maximize expression. This streamlined design reduces plasmid size and DNA synthesis costs while significantly enhancing AAV production, delivering approximately 2.0- to 6.5-fold higher viral titers, depending on the serotype, without compromising particle quality. The platform also demonstrated consistent performance from flask-scale studies to 2 L bioreactor production, highlighting its scalability and potential for cost-effective manufacturing.

In this webinar, we will present the design strategy behind the mini-helper plasmid, share transfection optimization results that enabled higher AAV titers with reduced total plasmid DNA input, and discuss how this platform can support next-generation AAV manufacturing approaches, including stable producer cell line development and dual-vector gene therapy applications. Viewers will gain insight into the rationale for the mini-helper design, understand how promoter optimization improves productivity while maintaining product quality, and explore its broader potential to advance scalable and economically sustainable AAV manufacturing.