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Endogenous p21-Dependent Transgene Control for CHO Cell Engineering.

Youngsik Lee1, Jin Myeong Kwak2, Jae Seong Lee1,2

  • 1Department of Molecular Science and Technology, Ajou University, Suwon 16499, Republic of Korea.

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|June 17, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for dynamic transgene expression control in Chinese hamster ovary (CHO) cells. This targeted gene integration system enhances therapeutic protein production by regulating apoptosis and gene expression.

Keywords:
Chinese hamster ovary cellsapoptosisendogenous gene taggingp21targeted integrationtransgene expression regulation

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Genetic Engineering

Background:

  • Chinese hamster ovary (CHO) cells are widely used for therapeutic protein production.
  • Current systems for transgene expression in CHO cells lack dynamic regulation.
  • Controlling transgene expression is crucial for optimizing protein production and cellular functions.

Purpose of the Study:

  • To investigate effective regulation of transgene expression in CHO cells via targeted integration-based endogenous gene tagging.
  • To engineer CHO cells for reduced apoptosis and controlled gene expression.
  • To establish a valuable CHO cell engineering tool for dynamic transgene expression control.

Main Methods:

  • Targeted integration of EGFP-human Bcl-2 into the p21 locus in CHO cells.
  • Comparison of targeted integration with random integration using a cytomegalovirus (CMV) promoter.
  • Analysis of expression dynamics of endogenous p21 and EGFP-human Bcl-2 in batch cultures.
  • Demonstration of inducible transgene expression using hydroxyurea.

Main Results:

  • Targeted integration of EGFP-human Bcl-2 into the p21 locus reduced apoptosis compared to random integration.
  • Endogenous p21 and EGFP-human Bcl-2 exhibited similar expression dynamics.
  • The anti-apoptotic effect of Bcl-2 altered endogenous p21 expression patterns, indicating mutual influence.
  • Inducible transgene expression was achieved with low concentrations of hydroxyurea.

Conclusions:

  • Targeted integration-based endogenous gene tagging provides effective regulation of transgene expression in CHO cells.
  • This strategy allows for dynamic control of gene expression in response to cellular states.
  • The developed engineering approach offers a valuable tool for CHO cell line development and biopharmaceutical production.