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Journal of Virology, September 2000, p. 7963-7971, Vol. 74, No. 17
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Construction, Phenotypic Analysis, and Immunogenicity of a UL5/UL29 Double Deletion Mutant of Herpes Simplex Virus 2

Xavier Da Costa,dagger Martha F. Kramer, Jia Zhu, Mark A. Brockman, and David M. Knipe*

Department of Microbiology and Molecular Genetics and Committee on Virology, Harvard Medical School, Boston, Massachusetts 02115

Received 7 April 2000/Accepted 7 June 2000

A number of studies have shown that replication-defective mutant strains of herpes simplex virus (HSV) can induce protective immunity in animal systems against wild-type HSV challenge. However, all of those studies used viruses with single mutations. Because multiple, stable mutations provide optimal levels of safety for live vaccines, we felt that additional mutations needed to be engineered into a candidate vaccine strain for HSV-2 and genital herpes. We therefore isolated an HSV-2 strain with deletion mutations in two viral DNA replication protein genes, UL5 and UL29. The resulting double deletion mutant virus strain, dl5-29, fails to form plaques or to give any detectable single cycle yields in normal monkey or human cells. Nevertheless, dl5-29 expresses nearly the same pattern of gene products as the wild-type virus or the single mutant viruses and induces antibody titers in mice that are equivalent to those induced by single deletion mutant viruses. Therefore, it is feasible to isolate a mutant HSV strain with two mutations in essential genes and with an increased level of safety but which is still highly immunogenic.

* Corresponding author. Mailing address: Department of Microbiology and Molecular Genetics and Committee on Virology, Harvard Medical School, 200 Longwood Ave., Boston, MA 02115. Phone: (617) 432-1934. Fax: (617) 432-0223. E-mail address: david_knipe{at}hms.harvard.edu.

dagger Present address: Wyeth Lederle Vaccines, Pearl River, NY 10965.

Journal of Virology, September 2000, p. 7963-7971, Vol. 74, No. 17
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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