Related Experiment Video
Updated: Aug 4, 2025
11:12
Transient Expression of Foreign Genes in Insect Cells sf9 for Protein Functional Assay
Published on: February 22, 2018
12.5K
φC31 -Mediated cassette exchange in Sf9 insect cells for stable expression
Die Hu1, Jingwen Qian1, Tong Zhang1
1State Key Laboratory of Bioreactor Engineering, Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, East China University of Science and Technology, Shanghai, China.
Biotechnology Journal
|April 5, 2023
Summary
A new cassette exchange system using site-specific integration (SSI) in Sf9 insect cells creates stable cell lines for biomanufacturing. This versatile platform accelerates the development of recombinant proteins, including influenza vaccines.
Area of Science:
- Biotechnology
- Molecular Biology
- Cell Biology
Background:
- Insect cells, particularly Sf9 cells, are vital for biomanufacturing due to high expression and post-translational modification capabilities.
- Traditional random integration methods for stable cell line development often result in instability.
- Site-specific integration (SSI) offers a more stable alternative for genetic modification.
Purpose of the Study:
- To establish a φC31-mediated cassette exchange system for site-specific integration in Sf9 cells.
- To develop a versatile and reusable platform for rapid generation of stable recombinant protein-producing cell lines.
- To demonstrate the system's efficacy in producing influenza subunit vaccines.
Main Methods:
- Random insertion of a tagging cassette with an egfp reporter gene into Sf9 cells.
- Selection of platform cell lines using fluorescence-activated cell sorting (FACS) and single-cell cloning.
- Co-transfection with a φC31-containing plasmid and a targeting cassette for cassette exchange.
- Screening of clones via hygromycin resistance and FACS to identify successful integration.
Main Results:
- Successful establishment of a φC31-mediated cassette exchange system in Sf9 cells.
- Generation of stable platform cell lines with desired expression, stability, and growth characteristics.
- Demonstrated rapid development of cell lines for influenza subunit vaccine production.
- Confirmed that resulting clones retained the expression properties of the platform cell lines.
Conclusions:
- The φC31-mediated cassette exchange system provides a robust method for SSI in Sf9 cells.
- This system serves as a versatile platform for accelerating the development of various biologics.
- The technology has significant potential to streamline and expedite biopharmaceutical development processes.
