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• W2802589296 abstract "During development of a cell line intended to support production of an IgG2 monoclonal antibody, a sequence variant caused by a genetic mutation was identified in the bulk drug substance. Gene copy number analysis together with the level of the observed variant in genomic DNA indicated that the master cell bank was a mixed population of cells; some harboring the variant copy and some mutation free. Since the cell bank had been single‐cell cloned, this variant could be used as a biomarker to demonstrate either that the bank was not derived from a single cell, or that the variant was a result of a post‐cloning genetic event, leading to a mixed population of cells. The sequence variant was only present in a small percentage of subclones, confirming the hypothesis that the cell bank was indeed a mixed population. Interrogation of subclones via Southern blot analysis revealed that almost all subclones had very similar transgene integrant structures, suggesting that the cell bank was likely derived from a single cell, and the cellular event that yielded the sequence variant was a post‐cloning event. Further, there were likely several other post‐cloning events that impacted transgene loci, leading to a population of related, yet genetically distinct cells comprising the cell bank. Despite this, the heterogeneous bank performed consistently in a bioprocess across generational age with comparable product quality. These results experimentally demonstrate the heterogeneity of a cell bank derived from a single cell, and its relationship to process consistency. © 2018 The Authors Biotechnology Progress published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers Biotechnol. Prog ., 34:602–612, 2018" @default.
• W2802589296 created "2018-05-17" @default.
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• W2802589296 date "2018-05-01" @default.
• W2802589296 modified "2023-10-13" @default.
• W2802589296 title "Analytical subcloning of a clonal cell line demonstrates cellular heterogeneity that does not impact process consistency or robustness" @default.
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• W2802589296 doi "https://doi.org/10.1002/btpr.2646" @default.
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