Abstract
We describe a technique for the systematic inactivation of nonessential genes within the genome of a herpesvirus without the requirement for phenotypic selection. This technique is based on the insertion of an oligonucleotide containing translational stop codons at a random site within a large cloned viral DNA fragment. Mutant virus is then reconstituted by cotransfection with overlapping viral clones, together comprising the entire viral genome, as described previously (M. van Zijl, W. Quint, J. Briaire, T. de Rover, A. Gielkens, and A. Berns, J. Virol. 62:2191-2195, 1988). This technique was used to construct, in a single experiment, a set of 13 viable pseudorabies virus strains with oligonucleotide insertions within all known genes of the Us region except for the gp50 gene, which proved essential for virus growth in cell culture. The growth rate in porcine kidney cells of mutants of all nonessential Us genes was similar to that of the parental virus, with the exception of a mutant of the recently identified protein kinase gene.
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Selected References
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