Journal
BIOTECHNOLOGY JOURNAL
Volume 13, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/biot.201700231
Keywords
Chinese hamster ovary cells; clonal variation; monoclonal antibody; protein intracellular transport; RNA sequencing
Funding
- QLD node of the National Biologics Facility, Australian Government
- Becas-Chile
- Novo Nordisk Fonden [NNF10CC1016517, NNF14OC0009473] Funding Source: researchfish
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The development of next-generation sequencing technologies has opened new opportunities to better characterize complex eukaryotic cells. Chinese hamster ovary (CHO) cells play a primary role in therapeutic protein production, with currently five of the top ten blockbuster drugs produced in CHO. However, engineering superior CHO cells with improved production features has had limited success to date and cell lines are still developed through the generation and screening of large strain pools. Here, we applied RNA sequencing to contrast a high and a low monoclonal antibody producing cell line. Rigorous experimental design achieved high reproducibility between biological replicates, remarkably reducing variation to less than 10%. More than 14000 gene-transcripts are identified and surprisingly 58% are classified as differentially expressed, including 2900 with a fold change higher than 1.5. The largest differences are found for gene-transcripts belonging to regulation of apoptosis, cell death, and protein intracellular transport GO term classifications, which are found to be significantly enriched in the high producing cell line. RNA sequencing is also performed on subclones, where down-regulation of genes encoding secreted glycoproteins is found to be the most significant change. The large number of significant differences even between subclones challenges the notion of identifying and manipulating a few key genes to generate high production CHO cell lines.
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