TY - JOUR
T1 - Comprehensive Analysis of Genomic Safe Harbors as Target Sites for Stable Expression of the Heterologous Gene in HEK293 Cells
AU - Shin, Seunghyeon
AU - Kim, Su Hyun
AU - Shin, Sung Wook
AU - Grav, Lise Marie
AU - Pedersen, Lasse Ebdrup
AU - Lee, Jae Seong
AU - Lee, Gyun Min
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
U2 - 10.1021/acssynbio.0c00097
DO - 10.1021/acssynbio.0c00097
M3 - Journal article
C2 - 32470292
AN - SCOPUS:85086748293
VL - 9
SP - 1263
EP - 1269
JO - A C S Synthetic Biology
JF - A C S Synthetic Biology
SN - 2161-5063
IS - 6
ER -