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. 1997 Oct;71(10):7736–7743. doi: 10.1128/jvi.71.10.7736-7743.1997

Equimolar generation of the four possible arrangements of adjacent L components in herpes simplex virus type 1 replicative intermediates.

D Bataille 1, A L Epstein 1
PMCID: PMC192125  PMID: 9311858

Abstract

Herpes simplex virus type 1 (HSV-1) replication generates high-molecular-weight intermediates containing branched DNA and concatemers carrying adjacent genomes with inverted L components. We have studied replicative intermediates generated by (i) wild-type HSV-1; (ii) 5dl1.2, an ICP27 null mutant which fails to synthesize normal amounts of DNA and late proteins; (iii) RBMu3, a mutant containing a deletion in the inverted repeats which fails to generate genomic isomers; and (iv) amplicon plasmids and vectors which contain no inverted sequences. Replication intermediates were analyzed by pulsed-field gel electrophoresis, after restriction enzyme digestion of infected-cell DNA, followed by blot hybridization. DNA fragments were statistically quantified after phosphorimaging. We observed that (i) the four possible configurations of L components of two adjacent genomes in the concatemers are present at equimolar amounts at any time during virus replication, (ii) ICP27 is not required for inversions or for branched DNA to occur, and (iii) replication intermediates of both RBMu3 mutant and amplicon plasmids or vectors do contain branched structures, although the concatemers they generate contain no inversions. These data indicate that inversions are generated by a mechanism intrinsically linked to virus DNA replication, most likely homologous recombination between inverted repeats. Branched structures are detected in all replicating molecules, including those that do not invert, suggesting that they are constitutively linked to virus DNA synthesis. Our results are consistent with the notion that the four HSV-1 genomic isomers are generated by alternative cleavage frames of replication concatemers containing equimolar amounts of L-component inversions.

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Selected References

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