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Related Experiment Videos

Multigene RNA vector based on coronavirus transcription.

Volker Thiel1, Nadja Karl, Barbara Schelle

  • 1Institute of Virology and Immunology, University of Würzburg, Würzburg, Germany. volker.thiel@kssg.ch

Journal of Virology
|August 28, 2003
PubMed
Summary

Researchers developed a novel RNA vector using human coronavirus 229E for multigene expression. This vector successfully transduced human dendritic cells, offering a new tool for gene delivery and vaccine development.

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Area of Science:

  • Virology
  • Molecular Biology
  • Gene Therapy

Background:

  • Coronavirus genomes are large, positive-sense RNAs crucial for viral replication and transcription.
  • Coronaviruses synthesize a unique nested set of subgenomic mRNAs, each typically encoding a single protein.
  • These features present an opportunity for developing novel eukaryotic expression systems.

Purpose of the Study:

  • To engineer a multigene expression vector based on the human coronavirus 229E.
  • To demonstrate the vector's capability for expressing multiple reporter genes.
  • To assess the potential of the vector for transducing human dendritic cells.

Main Methods:

  • Constructed a prototype RNA vector incorporating 5' and 3' ends of the human coronavirus genome, the replicase gene, and three reporter genes (chloramphenicol acetyltransferase, firefly luciferase, green fluorescent protein).

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  • Utilized coronavirus transcription-associated sequences to drive the synthesis of individual subgenomic mRNAs for each reporter gene.
  • Transfected vector RNA and nucleocapsid protein mRNA into BHK-21 cells and packaged RNA into virus-like particles for transduction of dendritic cells.

    • Main Results:

    • Successfully expressed chloramphenicol acetyltransferase, firefly luciferase, and green fluorescent protein reporter proteins in transfected cells.
    • Confirmed the synthesis of coronavirus-specific mRNAs encoding the reporter proteins via sequence analysis.
    • Demonstrated that human coronavirus-based vector RNA can be packaged into virus-like particles capable of transducing human dendritic cells.

    Conclusions:

    • Developed a new class of eukaryotic, multigene expression vectors based on human coronavirus 229E.
    • The vector system enables the expression of multiple genes via subgenomic mRNA transcription.
    • The developed vector shows potential for gene delivery applications, particularly in transducing human dendritic cells.