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Quantification of the dynamics of population heterogeneities in CHO cultures with stably integrated fluorescent markers
Citation Link: https://doi.org/10.15480/882.2735
Publikationstyp
Journal Article
Date Issued
2020-03-04
Sprache
English
Author(s)
Institut
TORE-DOI
TORE-URI
Volume
412
Issue
9
Start Page
2065
End Page
2080
Citation
Analytical and Bioanalytical Chemistry 9 (412): 2065-2080 (2020-04-01)
Publisher DOI
Scopus ID
Publisher
Springer
Cell population heterogeneities and their changes in mammalian cell culture processes are still not well characterized. In this study, the formation and dynamics of cell population heterogeneities were investigated with flow cytometry and stably integrated fluorescent markers based on the lentiviral gene ontology (LeGO) vector system. To achieve this, antibody-producing CHO cells were transduced with different LeGO vectors to stably express single or multiple fluorescent proteins. This enables the tracking of the transduced populations and is discussed in two case studies from the field of bioprocess engineering: In case study I, cells were co-transduced to express red, green, and blue fluorescent proteins and the development of sub-populations and expression heterogeneities were investigated in high passage cultivations (total 130 days). The formation of a fast-growing and more productive population was observed with a simultaneous increase in cell density and product titer. In case study II, different preculture growth phases and their influence on the population dynamics were investigated in mixed batch cultures with flow cytometry (offline and automated). Four cell line derivatives, each expressing a different fluorescent protein, were generated and cultivated for different time intervals, corresponding to different growth phases. Mixed cultures were inoculated from them, and changes in the composition of the cell populations were observed during the first 48 h of cultivation with reduced process productivity. In summary, we showed how the dynamics of population heterogeneities can be characterized. This represents a novel approach to investigate the dynamics of cell population heterogeneities under near-physiological conditions with changing productivity in mammalian cell culture processes.
Subjects
Automated flow cytometry
Clonal stability
LeGO
Population heterogeneity
Process variability
DDC Class
540: Chemie
600: Technik
More Funding Information
Funding by German Federal Ministry of Education and Research (BMBF, Grant 031B0222). Funding by BMBF (Grants 031B0305 and 031B0577A).Funding from DFG Sonderforschungsbereich SFB841 (SP2).
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