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Publisher DOI: 10.1007/s00216-020-02401-5
Title: Quantification of the dynamics of population heterogeneities in CHO cultures with stably integrated fluorescent markers
Language: English
Authors: Möller, Johannes 
Rosenberg, Marcel 
Riecken, Kristoffer 
Pörtner, Ralf  
Zeng, An-Ping  
Jandt, Uwe 
Keywords: Automated flow cytometry; Clonal stability; LeGO; Population heterogeneity; Process variability
Issue Date: 4-Mar-2020
Publisher: Springer
Source: Analytical and Bioanalytical Chemistry 9 (412): 2065-2080 (2020-04-01)
Abstract (english): 
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.
DOI: 10.15480/882.2735
ISSN: 1618-2642
Journal: Analytical and bioanalytical chemistry 
Institute: Bioprozess- und Biosystemtechnik V-1 
Document Type: Article
Project: IBÖ-04: mDoE-Toolbox - Software zur modellgestützten Optimierung biotechnologischer Prozesse 
IBÖM04:mDoE-Toolbox2-Neue mDoE Software-Toolbox zur modellgestützten Optimierung biotechnologischer Prozesse 
Projekt DEAL 
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).
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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