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Journal of General Virology, Vol 79, 1603-1611, Copyright © 1998 by Society for General Microbiology

ARTICLES

The UL4 gene of herpes simplex virus type 1 is dispensable for latency, reactivation and pathogenesis in mice

PY Jun, LI Strelow, RC Herman, HS Marsden, T Eide, L Haarr and DA Leib
Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis, MO 63110, USA.

The UL4 gene of herpes simplex virus type 1 is predicted to encode a 21.5 kDa protein of 199 amino acids. Although UL4 is dispensable for growth in cell culture, its function is not known. In the present study, the promoter of UL4 was examined and found to contain a cAMP- response element which bound the transcription factor CREB, and was strongly activated by cAMP. A recombinant virus, termed UL4HS, was constructed with a nonsense linker inserted into the UL4 open reading frame, to make a truncated UL4 protein of 60 amino acids. In addition, a marker-rescued virus, UL4HSMR, was constructed. Western immunoblot analysis revealed a 23 kDa band in extracts of wild-type and marker- rescued virus infected cells which was missing for UL4HS. Only modest differences were observed in the abilities of wild-type and UL4-mutant viruses to grow in Vero cells or in contact-inhibited mouse C3H/10T1/2 cells. In addition, there were only modest differences between the ability of UL4HS to replicate in murine corneas and trigeminal ganglia relative to wild-type viruses, and reactivation of UL4HS from latency was unaffected. Taken together, these data demonstrate that UL4 is dispensable for latency and pathogenesis in mice.


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