Minimizing Clonal Variation during Mammalian Cell Line Engineering for Improved Systems Biology Data Generation

Area of Science:

• Cell biology
• Genomics
• Biotechnology

Background:

• Mammalian cell lines are crucial for research and biopharmaceutical production.
• Existing methods for engineering cell lines result in significant genomic and phenotypic diversity, hindering research.
• This diversity complicates studies on gene function and the discovery of new cellular mechanisms.

Purpose of the Study:

• To develop a method for minimizing clonal variation in engineered mammalian cell lines.
• To create a consistent platform for expressing recombinant proteins in CHO cells.
• To enable robust comparative studies of genome-engineered cell lines.

Main Methods:

• Utilized CRISPR technology to integrate a site-specific landing pad for recombinase-mediated cassette exchange in CHO cells.
• Generated subclones engineered to express four distinct recombinant proteins.
• Controlled environmental culture conditions to maintain subclone stability over time.

Main Results:

• Achieved minimized clonal variation and high consistency in growth and transgene transcript levels among subclones.
• Observed a consistent global transcriptional response to recombinant protein expression across subclones.
• Demonstrated minimal phenotypic and transcriptomic variation over time under controlled conditions.
• Enabled improved studies on the impact of transgenes on the host cell transcriptome.

Conclusions:

• The developed platform effectively minimizes clonal variation in CHO cells.
• This platform supports robust comparative studies of genome-engineered cell lines.
• The technology is applicable to other mammalian cells for diverse biological and biotechnological applications.