Robust cell line development using meganucleases.

Area of Science:

• Biotechnology
• Molecular Biology
• Genomics

Background:

• Cell line development is crucial for biopharmaceutical production and drug target screening.
• Reproducible and stable transgene expression is essential for engineered cell lines.
• Meganucleases are powerful genome engineering tools that enhance homologous gene targeting.

Purpose of the Study:

• To detail the use of meganucleases for gene targeting in Chinese hamster ovary-K1 cells.
• To describe a gene insertion procedure utilizing a promoter-less marker gene for selection.
• To evaluate the reproducibility and stability of transgene expression following meganuclease-mediated gene insertion.

Main Methods:

• Employing meganucleases, specifically the yeast I-SceI, for targeted DNA cleavage in CHO-K1 cells.
• Implementing a gene insertion strategy with a promoter-less marker gene for efficient selection of targeted clones.
• Monitoring transgene expression levels and stability in engineered cell lines over a four-month period.

Main Results:

• Demonstrated successful gene targeting and insertion in Chinese hamster ovary-K1 cells using meganucleases.
• Confirmed reproducible transgene expression among different targeted clones.
• Showed stable transgene expression over a four-month observation period.

Conclusions:

• Meganucleases offer a robust method for precise gene insertion in CHO-K1 cells, facilitating stable and reproducible transgene expression.
• The described gene insertion procedure using a promoter-less marker gene is effective for cell line development.
• This approach is applicable to both natural and engineered meganucleases for various genome engineering applications.