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. 1997 Sep;71(9):6842–6849. doi: 10.1128/jvi.71.9.6842-6849.1997

Direct repeats of the herpes simplex virus a sequence promote nonconservative homologous recombination that is not dependent on XPF/ERCC4.

X D Yao 1, M Matecic 1, P Elias 1
PMCID: PMC191965  PMID: 9261409

Abstract

We have examined mechanisms of recombination in mammalian cells infected with herpes simplex virus type 1 (HSV-1). Amplification of plasmids containing a viral origin of replication, oriS, in cells superinfected with HSV-1 revealed that linear DNA could be efficiently converted to templates for replication. Two distinct pathways were observed: imprecise end joining and nonconservative homologous recombination. We noted that direct repeats of the viral a sequence promoted efficient nonconservative homologous recombination in BHK cells as well as human repair-proficient 1BR.3N cells and xeroderma pigmentosum group F (XP-F) cells. The reaction gave rise to functional a sequences supporting the formation of defective viruses. It did not seem to proceed by single-strand annealing since it occurred in the absence of XPF/ERCC4, the mammalian homolog of the Rad1 endonuclease from Saccharomyces cerevisiae. In contrast, direct repeats of a 161-bp nonviral sequence did not take part in nonconservative homologous recombination in XP-F cells. Our results suggest that homologous recombination may be involved in the circularization of viral genomes. Furthermore, they demonstrate that amplification of recombination products supported by HSV-1 allows a direct examination of pathways for double-strand-break repair in human cells.

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Selected References

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