Journal
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fbioe.2022.722722
Keywords
Chinese hamster ovary cells; poly A elements; transgene expression; stability; optimization
Funding
- National Natural Science Foundation of China [U1804168, 32071468]
- Key Scientific Research Project of Higher Education of Henan Province, China [22A310009]
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This study investigated the effects of different poly A elements on transgene expression in CHO cells. The results showed that SV40 and Synt poly A significantly increased eGFP transgene expression and maintained long-term expression, while reducing expression variation. The choice of suitable poly A element is helpful in improving the expression of recombinant protein.
The generation of the stable, high-level recombinant protein-producing cell lines remains a significant challenge in the biopharmaceutical industry. Expression vector optimization is an effective strategy to increase transgene expression levels and stability, and the choice of suitable poly A element is crucial for the expression of recombinant protein. In this study, we investigated the effects of different poly A elements on transgene expression in Chinese hamster ovary (CHO) cells. Five poly A elements, including bovine growth hormone (BGH), mutant BGH, herpes simplex virus type 1 thymidine kinase (HSV-TK), SV40, and a synthetic (Synt) poly A, were cloned into the expression vector and transfected into CHO cells. The results indicated the SV40 and Synt poly A sequences can significant improve eGFP transgene expression in stable transfected CHO cells and maintain long-term expression. However, qPCR results showed that the eGFP expression at protein level was not related to the gene copy number and mRNA level. Importantly, the SV40 and Synt poly A elements decreased the variation of eGFP transgene expression. Furthermore, it also showed that the SV40 and Synt poly A elements induced higher levels of adalimumab expression. In conclusion, SV40 poly A and Synt poly A are stronger elements that increase stable transgene expression and decrease the variation of expression, and the choice of suitable poly A element is helpful to improve the expression of recombinant protein.
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