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Cell Line Development Using Targeted Gene Integration into MAR-Rich Landing Pads for Stable Expression of Transgenes.

Claudia Oliviero1, Steffen C Hinz1, Julius Grzeschik2

  • 1Institute of Life Technologies, Haute Ecole d'Ingénierie HES-SO Valais Wallis, Sion, Switzerland.

Methods in Molecular Biology (Clifton, N.J.)
|July 5, 2023
PubMed
Summary
This summary is machine-generated.

Targeted gene integration using matrix attachment region (MAR)-rich landing pads (LPs) enables site-specific, simultaneous insertion of multiple genes of interest (GOIs) into mammalian cells. This method accelerates biotherapeutic production by reducing cell line development timelines and improving clone consistency.

Keywords:
AntibodiesCHO cellsCell line developmentProtein expressionRecombinant proteinSite-specific integrationStable transfection

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cell Line Development

Background:

  • Mammalian cell line development for biotherapeutics relies on integrating genes of interest (GOIs).
  • Random integration methods often lead to heterogeneity and longer development timelines.
  • Targeted gene integration offers a more efficient and consistent approach.

Purpose of the Study:

  • To describe protocols for generating host cell lines with matrix attachment region (MAR)-rich landing pads (LPs).
  • To enable site-specific and simultaneous integration of multiple GOIs.
  • To facilitate faster and more consistent cell line development for biotherapeutic production.

Main Methods:

  • Generation of host cell lines containing MAR-rich landing pads (LPs).
  • Incorporation of BxB1 recombination sites within the LPs.
  • Site-specific integration of multiple GOIs into the LPs.

Main Results:

  • Successfully generated stable cell lines with integrated LPs.
  • Demonstrated site-specific and simultaneous integration of multiple GOIs.
  • Produced stable recombinant clones expressing transgenes for antibody production.

Conclusions:

  • MAR-rich LPs with recombination sites provide an efficient platform for targeted gene integration.
  • This approach significantly reduces heterogeneity and shortens timelines in cell line development.
  • The developed cell lines are suitable for producing mono- or multispecific antibodies.