文献类型：期刊文献

英文题名：Tuning capsid formation dynamics in recombinant adeno-associated virus producing synthetic cell lines to enhance full particle productivity

作者：Lu, Min[1];Lin, Yu-Chieh[1];Kuo, Han-Jung[1];Cai, Wen[1];Ye, Qian[2];Zhao, Liang[2];Hu, Wei-Shou[1,3]

机构：[1]Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN USA;[2]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai, Peoples R China;[3]Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA

年份：2024

卷号：19

期号：3

外文期刊名：BIOTECHNOLOGY JOURNAL

收录：;EI(收录号：20241215771161);WOS:【SCI-EXPANDED(收录号:WOS:001184088900001)】；

基金：The authors would like to acknowledge the Center for Metabolomics and Proteomics at the University of Minnesota for targeted proteomic analysis. The Leap-In transposon plasmid backbone and Leap-In Transposase (R) mRNA were kindly provided by ATUM. Figures 1A, Figure S1A, and graphic abstract were created with BioRender.com.

语种：英文

外文关键词：adeno-associated virus; gene therapy; synthetic biology; systems biology

摘要：Recombinant adeno-associated virus (rAAV) is widely used as an in vivo delivery vector for gene therapy. It is used in a very large dose, and the large quantities required for broad applications present manufacturing challenges. We have developed a synthetic biology platform of constructing cell lines integrated with essential viral genes which can be induced to produce rAAV without plasmid transfection or virus transduction. Through iterative design-construct-characterization cycles, we have showcased the potential of this synthetic cell production system. Systems characterization of the dynamics of viral transcripts and proteins as well as virus assembly and packaging revealed that the expression level and balance of viral genome and capsid protein are keys to not only the productivity but also the full particle content, an important product quality attribute. Boosting cap gene expression by sequential transfection and integration of multiple copies of the cap gene elevated the rAAV titer to levels on a par with traditional plasmid transfection and virus infection. However, overexpression of the cap gene shifted the balance and kinetics of the genome and capsid. We independently tuned the dynamics of genome amplification and capsid protein synthesis by modulating the induction concentration as well as the time profile, and significantly enhanced full particle content while maintaining a high productivity. This strategy of constructing an inducible stable producer cell line is readily adaptable to rAAV vectors of different serotypes and payloads. It can greatly facilitate scalable production of gene therapy vectors. Recombinant adeno-associated virus (rAAV) is a widely used gene delivery vehicle for human gene therapies, but large-scale rAAV manufacturing using plasmid transfection and virus infection faces challenges such as cost and inefficiency. This study presents an innovative platform by enhancing previously developed synthetic rAAV producer cell lines. These high-producing cell lines were integrated with all essential viral components and supplemented with additional copies of the cap gene. They not only generated rAAV with high titers upon induction but also achieved high full-to-empty particle ratios by tuning capsid formation through inducer concentrations and induction time profiles. image