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Recombinant AAV vectors containing the foot and mouth disease virus 2A sequence confer efficient bicistronic gene expression in cultured cells and rat substantia nigra neurons

Gene Therapy volume 8, pages 864–873 (2001)Cite this article

Abstract

Recombinant adeno-associated viruses (rAAVs) are promising vectors for gene therapy since they efficiently and stably transduce a variety of tissues of immunocompetent animals. The major disadvantage of rAAVs is their limited capacity to package foreign DNA (⩽5 kb). Often, co-expression of two or more genes from a single viral vector is desirable to achieve maximal therapeutic efficacy or to track transduced cells in vivo by suitable reporter genes. The internal ribosome entry site (IRES) sequence of encephalomyocarditis virus has been widely used to construct bicistronic viral vectors. However, the IRES is rather long and IRES-mediated translation can be relatively inefficient when compared with cap-dependent translation. As an alternative to the IRES for in vivo gene expression, we studied the 16 amino-acid long 2A peptide of foot and mouth disease virus (FMDV). The 2A peptide mediates the primary cis-‘cleavage’ of the FMDV polyprotein in a cascade of processing events that ultimately generate the mature FMDV proteins. We have generated several different rAAV genomes in which two coding regions are fused in-frame via the FMDV 2A sequence. We show that FMDV 2A efficiently mediates the generation of the expected cleavage products from the artificial fusion proteins in cells. Furthermore, we find that both EGFP and α- synuclein are expressed at substantially higher levels from 2A vectors than from the corresponding IRES-based vectors, while SOD-1 is expressed at comparable or slightly higher levels. Finally, we demonstrate for the first time, that the 2A sequence results in effective bicistronic gene expression in vivo after injection of 2A-dependent rAAVs into the rat substantia nigra. We conclude that 2A-containing rAAVs may represent an attractive alternative to IRES-dependent vectors for ex vivo and in vivo gene expression and gene therapy.

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Acknowledgements

We thank Martin Ryan for plasmid pTG395, Thomas Bächi and Zhizhong Dong for help with confocal microscopy and Fritz Ochsenbein for preparing figures. We are also grateful to Lee Martin for helpful discussion and critical reading of the manuscript. This work was supported by grants from the Swiss National Science Foundation to HB.

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  1. Institut für Molekularbiologie, Universität Zürich, Winterthurerstrasse 190, Zürich, CH-8057, Switzerland

    S Furler, J-C Paterna, M Weibel & H Büeler

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  1. S Furler
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Furler, S., Paterna, JC., Weibel, M. et al. Recombinant AAV vectors containing the foot and mouth disease virus 2A sequence confer efficient bicistronic gene expression in cultured cells and rat substantia nigra neurons. Gene Ther 8, 864–873 (2001). https://doi.org/10.1038/sj.gt.3301469

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