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Jalšić L, Lytvyn V, Elahi SM, Hrapovic S, Nassoury N, Chahal PS, Gaillet B, Gilbert R. Inducible HEK293 AAV packaging cell lines expressing Rep proteins. Mol Ther Methods Clin Dev 2023; 30:259-275. [PMID: 37560197 PMCID: PMC10407821 DOI: 10.1016/j.omtm.2023.07.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 07/11/2023] [Indexed: 08/11/2023]
Abstract
Packaging or producer cell lines for scalable recombinant adeno-associated virus (rAAV) production have been notoriously difficult to create due in part to the cytostatic nature of the Rep proteins required for AAV production. The most difficult challenge being creating AAV packaging cell lines using HEK293 parental cells, currently the best mammalian platform for rAAV production due to the constitutive expression of E1A in HEK293 cells, a key REP transcription activator. Using suspension and serum-free media adapted HEK293SF carrying a gene expression regulation system induced by addition of cumate and coumermycin, we were able to create REP-expressing AAV packaging cells. This was achieved by carefully choosing two of the AAV Rep proteins (Rep 40 and 68), using two inducible promoters with different expression levels and integrating into the cells through lentiviral vector transduction. Three of our best clones produced rAAV titers comparable to titers obtained by standard triple plasmid transfection of their parental cells. These clones were stable for up to 7 weeks under continuous cultures condition. rAAV production from one clone was also validated at scale of 1 L in a wave bioreactor using serum-free suspension culture.
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Affiliation(s)
- Lovro Jalšić
- Département de Génie Chimique, Université Laval, Québec, QC G1V0A6, Canada
- Department of Production Platforms and Analytics, Human Health Therapeutics Research Center, National Research Council Canada, Montréal, QC H4P 2R2, Canada
| | - Viktoria Lytvyn
- Department of Production Platforms and Analytics, Human Health Therapeutics Research Center, National Research Council Canada, Montréal, QC H4P 2R2, Canada
| | - Seyyed Mehdy Elahi
- Department of Production Platforms and Analytics, Human Health Therapeutics Research Center, National Research Council Canada, Montréal, QC H4P 2R2, Canada
| | - Sabahudin Hrapovic
- Advanced Biomaterials and Chemical Synthesis Team, Aquatic and Crop Resource Development Research Centre, National Research Council Canada, Montréal, QC H4P 2R2, Canada
| | - Nasha Nassoury
- Department of Production Platforms and Analytics, Human Health Therapeutics Research Center, National Research Council Canada, Montréal, QC H4P 2R2, Canada
| | - Parminder Singh Chahal
- Department of Production Platforms and Analytics, Human Health Therapeutics Research Center, National Research Council Canada, Montréal, QC H4P 2R2, Canada
| | - Bruno Gaillet
- Département de Génie Chimique, Université Laval, Québec, QC G1V0A6, Canada
| | - Rénald Gilbert
- Département de Génie Chimique, Université Laval, Québec, QC G1V0A6, Canada
- Department of Production Platforms and Analytics, Human Health Therapeutics Research Center, National Research Council Canada, Montréal, QC H4P 2R2, Canada
- Department of Bioengineering, McGill University, Montréal, QC H3A 0E9 Canada
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