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Single-step cloning-screening method: a new tool for developing and studying high-titer viral vector producer cells
A F Rodrigues1,2, A S Formas-Oliveira1,2, M R Guerreiro1,2
1Instituto de Biologia Experimental e Tecnológica (iBET), Oeiras, Portugal.
Gene Therapy
|May 5, 2015
Summary
This study introduces a novel Split GFP screening method for rapid viral vector producer cell cloning and titer assessment. This technique accelerates cell line development for viral gene therapy by identifying high-producing clones efficiently.
Area of Science:
- Biotechnology
- Molecular Biology
- Gene Therapy
Background:
- Efficient viral vector production is crucial for gene therapy.
- Current methods for screening producer cell clones are often time-consuming.
- Optimizing producer cell lines can significantly enhance vector yield and quality.
Purpose of the Study:
- To develop and validate a novel, rapid method for screening viral vector producer cell clones.
- To enable high-throughput assessment of viral vector titers.
- To facilitate the optimization of producer cell lines for enhanced viral gene therapy applications.
Main Methods:
- Utilized a Split GFP system (S10 and S11 fragments) for transcomplementation-based fluorescence screening.
- Integrated producer cell cloning with vector titer assessment in a 96-well plate format.
- Co-cultured producer cells with target cells expressing the complementary Split GFP fragment.
Main Results:
- Screened 200-500 clones within 2 weeks, identifying high-producing clones.
- Achieved retrovirus titers up to 10^8 infectious particles/ml with optimal infectious-to-total particle ratios.
- Demonstrated improved titers in HEK 293T cells and via genetic manipulation of glutathione metabolism.
Conclusions:
- The developed Split GFP screening method significantly accelerates cell line development for viral vectors.
- This approach is valuable for optimizing producer cell lines and advancing viral gene therapy.
- Genetic manipulation of cell metabolism can substantially increase viral vector expression and titers.
