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Journal of Virology, November 2003, p. 11312-11323, Vol. 77, No. 21
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.21.11312-11323.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Coronaviruses as Vectors: Position Dependence of Foreign Gene Expression

Cornelis A. M. de Haan, Linda van Genne, Jeroen N. Stoop, Haukeline Volders, and Peter J. M. Rottier*

Virology Division, Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine and Institute of Biomembranes, Utrecht University, 3584 CL Utrecht, The Netherlands

Received 21 April 2003/ Accepted 5 August 2003

Coronaviruses are the enveloped, positive-stranded RNA viruses with the largest RNA genomes known. Several features make these viruses attractive as vaccine and therapeutic vectors: (i) deletion of their nonessential genes is strongly attenuating; (ii) the genetic space thus created allows insertion of foreign information; and (iii) their tropism can be modified by manipulation of the viral spike. We studied here their ability to serve as expression vectors by inserting two different foreign genes and evaluating systematically the genomic position dependence of their expression, using a murine coronavirus as a model. Renilla and firefly luciferase expression cassettes, each provided with viral transcription regulatory sequences (TRSs), were inserted at several genomic positions, both independently in different viruses and combined within one viral genome. Recombinant viruses were generated by using a convenient method based on targeted recombination and host cell switching. In all cases high expression levels of the foreign genes were observed without severe effects on viral replication in vitro. The expression of the inserted gene appeared to be dependent on its genomic position, as well as on the identity of the gene. Expression levels increased when the luciferase gene was inserted closer to the 3' end of the genome. The foreign gene insertions generally reduced the expression of upstream viral genes. The results are consistent with coronavirus transcription models in which the transcription from upstream TRSs is attenuated by downstream TRSs. Altogether, our observations clearly demonstrate the potential of coronaviruses as (multivalent) expression vectors.

* Corresponding author. Mailing address: Virology Division, Department of Infectious Diseases and Immunology, Yalelaan 1, 3584CL Utrecht, The Netherlands. Phone: 31-30-2532462. Fax: 31-30-2536723. E-mail: p.rottier{at}vet.uu.nl.

Journal of Virology, November 2003, p. 11312-11323, Vol. 77, No. 21
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.21.11312-11323.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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