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

Seunghyeon Shin, Su Hyun Kim, Sung Wook Shin, Lise Marie Grav, Lasse Ebdrup Pedersen, Jae Seong Lee*, Gyun Min Lee*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.

Original languageEnglish
JournalACS Synthetic Biology
Volume9
Issue number6
Pages (from-to)1263-1269
ISSN2161-5063
DOIs
Publication statusPublished - 2020

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