Journal article
Comprehensive Analysis of Genomic Safe Harbors as Target Sites for Stable Expression of the Heterologous Gene in HEK293 Cells
Korea Advanced Institute of Science and Technology1
Ajou University2
Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark3
CHO Cell Line Engineering and Design, Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark4
Department of Biotechnology and Biomedicine, Technical University of Denmark5
Human cell lines are being increasingly used as host cells to produce therapeutic glycoproteins, due to their human glycosylation machinery. In an attempt to develop a platform for generating isogenic human cell lines producing therapeutic proteins based on targeted integration, three well-known human genomic safe harbors (GSHs)-AAVS1, CCR5, and human ROSA26 loci-were evaluated with respect to the transgene expression level and stability in human embryonic kidney (HEK293) cells.
Among the three GSHs, the AAVS1 locus showed the highest eGFP expression with the highest homogeneity. Transgene expression at the AAVS1 locus was sustained without selection for approximately 3 months. Furthermore, the CMV promoter showed the highest expression, followed by the EF1α, SV40, and TK promoters at the AAVS1 locus.
Master cell lines were created using CRISPR/Cas9-mediated integration of the landing pad into the AAVS1 locus and were used for faster generation of recombinant cell lines that produce therapeutic proteins with recombinase-mediated cassette exchange.
| Language: | English |
|---|---|
| Publisher: | American Chemical Society |
| Year: | 2020 |
| Pages: | 1263-1269 |
| ISSN: | 21615063 |
| Types: | Journal article |
| DOI: | 10.1021/acssynbio.0c00097 |
| ORCIDs: | Pedersen, Lasse Ebdrup , 0000-0002-3291-2093 , 0000-0002-9876-7378 and Grav, Lise Marie |
CCR5 protein, human CRISPR-Cas Systems CRISPR/Cas9 Gene Targeting Genes, Reporter Genetic Loci HEK cells HEK293 Cells Humans Plasmids Promoter Regions, Genetic RNA, Guide, CRISPR-Cas Systems RNA, Messenger RNA, Untranslated Receptors, CCR5 Simian virus 40 Transgenes genomic safe harbor recombinase-mediated cassette exchange site-specific integration site-specificintegration therapeutic protein
