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RNA‐Seq Highlights High Clonal Variation in Monoclonal Antibody Producing CHO Cells
Author(s) -
Orellana Camila A.,
Marcellin Esteban,
Palfreyman Robin W.,
Munro Trent P.,
Gray Peter P.,
Nielsen Lars K.
Publication year - 2018
Publication title -
biotechnology journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.144
H-Index - 84
eISSN - 1860-7314
pISSN - 1860-6768
DOI - 10.1002/biot.201700231
Subject(s) - chinese hamster ovary cell , biology , gene , cell culture , monoclonal antibody , rna , microbiology and biotechnology , protein biosynthesis , genetics , computational biology , antibody
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 14 000 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.