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Journal of General Virology, Vol 79, 565-572, Copyright © 1998 by Society for General Microbiology

ARTICLES

The BglII-N fragment of herpes simplex virus type 2 contains a region responsible for resistance to antiviral effects of interferon

M Narita, Y Ando, S Soushi, T Kurata and Y Arao
Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan.

Double infection with two interferon (IFN)-sensitive strains of herpes simplex virus (HSV), HSV-1(17syn) and HSV-2(UW268), showed reduced inhibition of virus growth by IFN. Intertypic recombinants with IFN resistance were obtained from the doubly infected cultures. These results indicate that HSV IFN resistance is controlled by at least two genetic regions. Restriction endonuclease analysis demonstrated that the recombinants were similar to HSV-2 in their genomic structure but the BamHI-A, BglII-I and BglII-N fragments of HSV-2 were commonly lost in the recombinants, suggesting that any of these fragments could be associated with HSV-2 IFN resistance. We cloned these fragments and BamHI-E, which overlaps BglII-N, from an IFN-resistant HSV-2 strain, HSV-2(G), and examined each fragment for its ability to rescue IFN resistance of HSV-2(UW268) by co-transfecting with the HSV-2(UW268) genome. Of the HSV-2(G) fragments, only BglII-N increased plating efficiency of progeny viruses in IFN-treated cells. An IFN-resistant HSV-2 clone was obtained from the BglII-N of HSV-2(G) and HSV-2(UW268) genome co-transfected culture, and a part of BglII-N of HSV-2(UW268) was replaced with that of HSV-2(G) in the HSV-2 clone. Thus, it was concluded that one of the HSV regions encoding IFN resistance is located on the BglII-N fragment of HSV-2.


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