Comprehensive Analysis of Genomic Safe Harbors as Target Sites for Stable Expression of the Heterologous Gene in HEK293 Cells

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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, CCRS, 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 EF1 alpha, 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.
Publisher
AMER CHEMICAL SOC
Issue Date
2020-06
Language
English
Article Type
Article
Citation

ACS SYNTHETIC BIOLOGY, v.9, no.6, pp.1263 - 1269

ISSN
2161-5063
DOI
10.1021/acssynbio.0c00097
URI
http://hdl.handle.net/10203/282018
Appears in Collection
BS-Journal Papers(저널논문)
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