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Related Experiment Videos

An expression vector for high-level protein synthesis in Vero cells.

N Israel1, N Chenciner, C Houlmann

  • 1Unité des Applications du Génie Génétique (G3), Institut Pasteur, France.

Gene
|September 30, 1989
PubMed
Summary

Two novel cloning vectors, pNI1 and pNI2, utilize the Ecogpt gene for dominant selection. These vectors facilitate high-level hepatitis B surface antigen synthesis and stable gene amplification in mammalian cells.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Virology

Background:

  • Development of versatile cloning vectors is crucial for gene expression studies.
  • The Ecogpt gene offers a dominant selectable marker for mammalian cell systems.
  • Efficient synthesis of viral antigens like hepatitis B surface antigen (HBsAg) is a key goal in vaccine development.

Purpose of the Study:

  • To construct and characterize two new multi-purpose cloning vectors, pNI1 and pNI2.
  • To evaluate the efficacy of these vectors for high-level protein synthesis in mammalian cells.
  • To demonstrate gene amplification for enhanced and stable antigen production.

Main Methods:

  • Construction of pNI1 and pNI2 vectors containing the Escherichia coli Ecogpt gene under different promoters (MMTV-LTR or SV40 early promoter).

Related Experiment Videos

  • Inclusion of a polylinker downstream of the human metallothionein IIA promoter.
  • Transfection of monkey Vero cells with pNI2 for hepatitis B surface antigen (HBsAg) expression.

    • Main Results:

    • Successful construction of pNI1 and pNI2 vectors with Ecogpt as a dominant selectable marker.
    • High-level synthesis of HBsAg was achieved in monkey Vero cells using the pNI2 vector.
    • Gene amplification and stable HBsAg synthesis were demonstrated using a modified selective medium.

    Conclusions:

    • The novel vectors pNI1 and pNI2 are effective tools for gene cloning and expression in mammalian cells.
    • The Ecogpt gene serves as a reliable dominant selectable marker.
    • The developed system allows for enhanced and stable production of recombinant proteins like HBsAg through gene amplification.