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Related Experiment Videos

Recombinant equine arteritis virus as an expression vector.

A A de Vries1, A L Glaser, M J Raamsman

  • 1Virology Division, Department of Infectious Diseases and Immunology, Veterinary Faculty, Utrecht University, Yalelaan 1, Utrecht, 3584 CL, The Netherlands.

Virology
|June 1, 2001
PubMed
Summary

Researchers created a novel equine arteritis virus (EAV) expression vector by inserting a green fluorescent protein (GFP) gene. This recombinant EAV expressed GFP but showed reduced replication and genetic instability, limiting its vector potential.

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Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Equine arteritis virus (EAV) is a key member of the Arteriviridae family, known for its unique nested subgenomic mRNA transcription mechanism.
  • Nidovirales viruses share a common gene expression strategy involving leader-containing subgenomic mRNAs.

Purpose of the Study:

  • To investigate the potential of utilizing the Nidovirales gene expression strategy for creating viral expression vectors.
  • To engineer a recombinant EAV capable of expressing an additional subgenomic mRNA encoding a reporter protein.

Main Methods:

  • Construction of an expression cassette containing a green fluorescent protein (GFP) gene with EAV transcription-regulating sequences.
  • Insertion of the genetic module into an infectious EAV cDNA clone (pBRNX1.38-5/6).

Related Experiment Videos

  • Transfection of BHK-21 cells with RNA transcripts and analysis of GFP expression, viral replication, and mRNA synthesis using microscopy, immunoprecipitation, and RT-PCR.

    • Main Results:

    • The recombinant EAV (pBRNX1.38-5/6-GFP) successfully expressed the GFP gene in transfected cells.
    • The recombinant virus was replication-competent but exhibited a slower cytopathic effect and growth disadvantage compared to the wild-type virus.
    • Analysis revealed the synthesis of nine EAV RNAs instead of the usual eight, with cryptic transcription signals within the GFP gene contributing to unintended mRNA species.
    • Translation of unintended mRNA resulted in an extended EAV M protein, and serial passage led to deletion mutants, indicating genetic instability.

    Conclusions:

    • The EAV genome can be engineered to express foreign genes, demonstrating the feasibility of EAV-based viral vectors.
    • The insertion of an additional transcription unit led to reduced viral fitness and genetic instability, highlighting challenges in vector development.
    • Further optimization is required to enhance the stability and replication efficiency of EAV-derived expression vectors.