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Cell Type-specific Gene Expression Profiling in the Mouse Liver
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Toward stable gene expression in CHO cells.

Mariati1, Esther Y C Koh, Jessna H M Yeo

  • 1a Bioprocessing Technology Institute; Agency for Science, Technology, and Research (A*STAR); Singapore, Republic of Singapore.

Bioengineered
|December 9, 2014
PubMed
Summary
This summary is machine-generated.

To improve recombinant protein production, researchers stabilized gene expression in mammalian cells. A modified human cytomegalovirus (hCMV) promoter with a CpG island element (IE) enhanced expression stability without reducing protein levels.

Keywords:
CHOcore CpG island elementexpression stabilitygene silencing

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cell Biology

Background:

  • Maintaining high gene expression is crucial for therapeutic recombinant protein production in mammalian cells.
  • Transcriptional silencing, driven by epigenetic events like DNA methylation, causes production instability.
  • CpG island elements (IE) from hamster adenine phosphoribosyltransferase gene prevent DNA methylation.

Purpose of the Study:

  • To engineer modified human cytomegalovirus (hCMV) promoters to enhance expression stability during long-term mammalian cell culture.
  • To evaluate the impact of CpG island element (IE) insertion on promoter function and expression stability.
  • To determine if the IE's effect on expression stability is promoter-specific.

Main Methods:

  • Modified hCMV promoters were generated by inserting one or two copies of the IE into various locations and orientations.
  • Expression stability was assessed in Chinese Hamster Ovary (CHO) cells.
  • The effect of IE insertion was also tested on a chimeric murine CMV (mCMV) enhancer and human elongation factor-1α (hEF) core promoter.

Main Results:

  • A modified hCMV promoter with one IE copy inserted in reverse orientation between the enhancer and core promoter (MR1) significantly enhanced expression stability in CHO cells.
  • The MR1 modification did not compromise the overall expression level compared to the wild-type hCMV promoter.
  • Insertion of IE into a chimeric mCMV/hEF promoter did not improve expression stability, suggesting promoter-specific effects.

Conclusions:

  • The MR1 modified hCMV promoter is a promising tool for stable, high-level recombinant protein production in mammalian cell lines.
  • The effectiveness of CpG island elements in enhancing expression stability is dependent on the specific promoter context.
  • Epigenetic silencing remains a key challenge in biopharmaceutical manufacturing that can be addressed through promoter engineering.