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Li YM, Wang M, Wang TY, Wei YG, Guo X, Mi CL, Zhao CP, Cao XX, Dou YY. Effects of different 2A peptides on transgene expression mediated by tricistronic vectors in transfected CHO cells. Mol Biol Rep 2019; 47:469-475. [PMID: 31659692 DOI: 10.1007/s11033-019-05153-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 10/22/2019] [Indexed: 12/22/2022]
Abstract
Multicistronic vectors can increase transgene expression and decrease the imbalance of gene expression in the Chinese hamster ovary (CHO) cell expression system. Small, self-cleaving 2A peptides have a high cleavage efficiency and are essential for constructing high-expression multicistronic vectors. In this study, we investigated the effects of two different 2A peptides on transgene expression in CHO cells via their mediating action on tricistronic vectors. The enhanced green fluorescent protein (eGFP) and red fluorescent protein (RFP) genes were linked by the porcine teschovirus-1 (P2A) and Thosea asigna virus (T2A) peptides in a multicistronic vector. We transfected CHO cells with these vectors and screened for the presence of blasticidin-resistant colonies. Flow cytometry and real-time quantitative PCR (qPCR) were used to detect the expression levels of eGFP and RFP and the copy numbers of stably transfected cells. The results showed that P2A could enhance eGFP and RFP expression by 1.48- and 1.47-fold, respectively, compared to T2A. The expression levels of the genes were not proportional to their copy numbers. In conclusion, we found that P2A can effectively drive transgene expression in CHO cells and a potent 2A peptide can be used for recombinant protein production in the CHO cell system.
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Affiliation(s)
- Yan-Mei Li
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Meng Wang
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Tian-Yun Wang
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China. .,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.
| | - Yong-Ge Wei
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Xiao Guo
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Chun-Liu Mi
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Chun-Peng Zhao
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Xiang-Xiang Cao
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
| | - Yuan-Yuan Dou
- Department of Biochemistry and Molecular Biology, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China.,International Joint Research Laboratory for Recombiant Pharmaceutical Protein Expression System of Henan, Xinxiang Medical University, Jinsui Road, Xinxiang, 453003, Henan, People's Republic of China
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