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  11. Duplication Of A Chromosome 2 Segment In Production Cho Cell Lines Correlates With Age-related Growth Improvement

Duplication of a chromosome 2 segment in production CHO cell lines correlates with age-related growth improvement

Wei Wei1, Laura Zielewicz1, Lin Zhang1,2

  • 1Cell Line Development, Biotherapeutics Pharmaceutical Sciences, Pfizer Inc, Andover, Massachusetts, USA.

Biotechnology Journal
|February 25, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Recombinant Chinese Hamster Ovary (CHO) cell lines can unexpectedly improve growth with age. This study identifies a specific 50.2 Mbp duplication on chromosome 2 (Chr2) as the cause of this age-correlated growth change in CHO cell lines.

Area of Science:

  • Biotechnology
  • Genomics
  • Cell Biology

Background:

  • Recombinant Chinese Hamster Ovary (CHO) cell line stability is critical for biomanufacturing.
  • Age-correlated phenotypic changes, like accelerated growth, are observed in CHO cell lines but poorly understood.
  • Investigating the molecular basis of these changes is essential for optimizing cell line development.

Purpose of the Study:

  • To elucidate the molecular mechanisms behind age-correlated cell growth improvement in recombinant CHO cell lines.
  • To identify genetic alterations associated with enhanced growth in aged CHO cell cultures.
  • To understand the role of genomic changes in CHO cell line stability during biomanufacturing.

Main Methods:

  • Whole-genome resequencing of multiple CHO cell lines expressing monoclonal antibodies (mAbs).
Keywords:
CHO cellsgene duplicationindustrial biotechnologyomics

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  • Comparative analysis of cell lines exhibiting age-correlated growth changes versus those without.
  • Transcriptome profiling to identify differentially expressed genes between high-growth and low-growth cell lines.

    • Main Results:

    • A specific 50.2 Mbp segment duplication on chromosome 2 (Chr2) was identified in CHO clones with age-correlated growth improvement.
    • This Chr2 duplication was independent of the type of monoclonal antibody expressed.
    • >95% of overexpressed genes in high-growth cell lines were located within the duplicated Chr2 segment.

    Conclusions:

    • Large genomic duplication on Chr2 is associated with age-correlated growth changes in recombinant CHO cell lines.
    • This finding represents the first report linking Chr2 duplication to enhanced growth in aged CHO cells.
    • Further research will focus on the causal relationship between Chr2 genes and growth changes, aiming to improve cell line screening and engineering for stability.
    phenotypic instability