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J. Virol., 11 1995, 6779-6786, Vol 69, No. 11
LI Strelow and DA Leib
The herpes simplex virus type 1 (HSV-1) UL41 gene product, virion host
shutoff (vhs), has homologs among five alphaherpesviruses (HSV-1, HSV- 2,
pseudorabies virus, varicella-zoster virus, and equine herpesvirus 1),
suggesting a role for this protein in neurotropism. A mutant virus, termed
UL41NHB, which carries a nonsense linker in the UL41 open reading frame at
amino acid position 238 was generated. UL41NHB and a marker-rescued virus,
UL41NHB-R, were characterized in vitro and tested for their ability to
replicate in vitro and in vivo and to establish and reactivate from latency
in a mouse eye model. As demonstrated by Western blotting (immunoblotting)
and Northern (RNA) blotting procedures, UL41NHB encodes an appropriately
truncated vhs protein and, as expected for a vhs null mutant, fails to
induce the degradation of cellular glyceraldehyde-3-phosphate dehydrogenase
mRNA. The growth of UL41NHB was not significantly altered in one-step
growth curves in Vero or mouse C3H/10T1/2 cells but was impaired in
corneas, in trigeminal ganglia, and in brains of mice compared with the
growth of KOS and UL41NHB-R. As a measure of establishment of latency,
quantitative DNA PCR showed that the amount of viral DNA within trigeminal
ganglia latently infected with UL41NHB was reduced by approximately 30-fold
compared with that in KOS-infected ganglia and by 50-fold compared with
that in UL41NHB-R-infected ganglia. Explant cocultivation studies revealed
a low reactivation frequency for UL41NHB (1 of 28 ganglia, or 4%) compared
with that for KOS (56 of 76, or 74%) or UL41NHB-R (13 of 20 or 65%). Taken
together, these results demonstrate that vhs represents a determinant of
viral pathogenesis.
Copyright © 1995, American Society for Microbiology
Role of the virion host shutoff (vhs) of herpes simplex virus type 1 in latency and pathogenesis
Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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