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. 1992 Sep;66(9):5509–5515. doi: 10.1128/jvi.66.9.5509-5515.1992

A cell-free recombination system for site-specific integration of multigenic shuttle plasmids into the herpes simplex virus type 1 genome.

P J Gage 1, B Sauer 1, M Levine 1, J C Glorioso 1
PMCID: PMC289109  PMID: 1323709

Abstract

This report describes a novel method for complementation studies of defective herpes simplex virus (HSV) genes. Viral test gene and nonviral reporter gene cassettes were rapidly integrated into the HSV genome in a site-specific and reversible manner by using the P1 phage-based Cre-lox recombination system. Shuttle plasmids contained a functional loxP recombination site, an expressible form of the bacterial lacZ gene, and a copy of the wild-type glycoprotein B (gB) gene or double mutant gB allele containing both a temperature-sensitive (ts) mutation and a syncytium (syn)-forming mutation. A recipient viral genome, K delta T::lox1, was constructed from the HSV type 1 (syn) gB-deficient mutant virus, K delta T, by marker transfer of the loxP recombination site into the viral thymidine kinase locus. Shuttle plasmids of up to 12.9 kb in length were recombined with high efficiency (11 to 20%) into the K delta T::lox1 genome in cell-free, Cre-mediated recombination reactions. Expression of a functional wild-type or double mutant gB polypeptide complemented the nonfunctional polypeptide expressed from the deleted, normal gB locus and allowed production of either wild-type or Syn- plaques on Vero cells. The latter recombinant virus was also ts for growth. The ability to express viral genes from plasmids which can be shuttled into and out of the HSV genome in cell-free recombination reactions makes this a powerful method for performing genetic studies of the biologic properties of viral gene products.

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Selected References

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