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Transgenic Organisms

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In-vitro Mutagenesis

To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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Toxin-antitoxin based transgene expression in mammalian cells.

K Nehlsen1, S Herrmann, J Zauers

  • 1Helmholtz Centre for Infection Research, Braunschweig, Germany.

Nucleic Acids Research
|December 17, 2009
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This study introduces a novel method for stable, high recombinant gene expression in mammalian cells. Co-expressing a transgene with an antitoxin in toxin-expressing cells drives enrichment and boosts expression up to 120-fold.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cell Biology

Background:

  • Recombinant gene expression in mammalian cells is often limited by transgene integration site effects and epigenetic factors.
  • Achieving stable, high-level transgene expression is crucial for various biotechnological applications.

Purpose of the Study:

  • To develop a method for achieving and stabilizing high transgene expression in proliferating mammalian cell cultures.
  • To establish a drug-free system for enhancing and maintaining recombinant protein production.

Main Methods:

  • Utilized Chinese Hamster Ovary (CHO) cell lines conditionally expressing the toxin kid.
  • Co-expressed the antitoxin kis with transgenes of interest, leveraging the growth advantage conferred by antitoxin expression.
  • Cultivated pools of transfectants in the presence of the toxin to enrich for high-expressing cells.

Main Results:

  • Transgene expression increased up to 120-fold over several weeks in cultures expressing the toxin.
  • Cells with strong antitoxin expression were enriched due to a growth advantage.
  • Transgene expression decreased when toxin expression was absent.

Conclusions:

  • The co-expression of a transgene with its corresponding antitoxin in toxin-expressing cells provides a robust method for high and stable gene expression.
  • This approach enables drug-free selection and enrichment of cells with superior transgene productivity.
  • The described method offers a simple and effective strategy for generating overexpressing cell lines for recombinant protein production.