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Related Experiment Videos

Orientation-dependent gene expression with Epstein-Barr virus-derived vectors.

Kathleen Van Craenenbroeck1, Peter Vanhoenacker, Inge Roman

  • 1Department for Molecular Biology, Ghent University - VIB, K.L. Ledeganckstraat 35, 9000, Gent, Belgium. guy.haegeman@ugent.be

FEBS Letters
|December 17, 2003
PubMed
Summary

This study developed an Epstein-Barr virus (EBV)-based episomal vector for regulated protein expression in mammalian cells. The vector, utilizing the interferon-inducible Mx promoter, efficiently expressed reporter and receptor genes without chromosomal integration.

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Area of Science:

  • Molecular Biology
  • Mammalian Cell Culture
  • Gene Expression Systems

Background:

  • Episomal vectors offer non-integrating, multi-copy persistence in mammalian cells for heterologous protein expression.
  • Constitutive gene expression can be detrimental to cell viability, necessitating regulated expression strategies.

Purpose of the Study:

  • To develop an efficient and strictly regulated episomal expression system for heterologous proteins in mammalian cells.
  • To investigate the impact of promoter choice and vector orientation on gene expression levels.

Main Methods:

  • Utilized an Epstein-Barr virus (EBV)-derived episomal vector containing EBNA1 and the viral origin of replication.
  • Integrated the interferon-inducible Mx promoter for regulated gene expression.
  • Cloned and expressed reporter gene chloramphenicol acetyltransferase (CAT) and neurotransmitter receptor h5-HT(1B).

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  • Analyzed expression levels and vector copy number via biochemical assays and Northern blot analysis.

    • Main Results:

    • Achieved efficient and regulated expression of CAT (16 ng/mg protein) and h5-HT(1B) (1300 fmol/mg protein).
    • Demonstrated that expression levels were influenced by the orientation of the expression cassette.
    • Identified transcriptional read-through from the thymidine kinase promoter as a factor affecting gene expression in the less favored orientation.

    Conclusions:

    • The EBV-based episomal vector with the Mx promoter provides a robust system for regulated heterologous protein expression.
    • Vector orientation significantly impacts expression efficiency, likely due to promoter read-through effects.
    • This system holds potential for applications requiring controlled protein production in mammalian cells.