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. 1993 Aug;67(8):4605–4610. doi: 10.1128/jvi.67.8.4605-4610.1993

Viral determinants of age-dependent virulence of Sindbis virus for mice.

P C Tucker 1, E G Strauss 1, R J Kuhn 1, J H Strauss 1, D E Griffin 1
PMCID: PMC237845  PMID: 8392602

Abstract

Many alphaviruses cause more severe disease in young animals than in older animals. The age-dependent resistance to severe disease is determined primarily by maturation of the host, but strains of virus can be selected that overcome the increased resistance of mature animals. Sindbis virus (SV) strain AR339 causes fatal encephalitis in newborn mice and nonfatal encephalitis in weanling mice, whereas NSV, a neuroadapted strain of SV, causes fatal encephalitis in weanling as well as newborn mice. We have previously shown that the E2 glycoprotein of NSV contained His-55, whereas AR339 E2 had Gln-55 (S. Lustig, A. C. Jackson, C. S. Hahn, D. E. Griffin, E. G. Strauss, and J. H. Strauss, J. Virol. 62:2329-2336, 1988) and that SV with E2 containing Gly-172 was more virulent for newborn mice than SV with E2 containing Arg-172 (P. C. Tucker and D. E. Griffin, J. Virol. 65:1551-1557, 1991). Here we tested the virulence for both newborn and older mice of SV containing a number of different amino acids at E2 position 55 (His, Gln, Lys, Arg, Glu, Gly) in combination with both Gly-172 and Arg-172. All the viruses were virulent for newborn mice, but the residues at both 55 and 172 influenced the virulence of the virus, and there were differences in virulence observed among the various viruses. However, only viruses with His-55 were fully virulent for 14-day-old mice, and this virulence was independent of the residue at position 172. Virus with Lys-55 was virulent for 7-day-old mice, although slightly attenuated relative to His-55. Viruses with His-55 grew more rapidly and to higher titer in the brains of 7- and 14-day-old mice, in N18 neuroblastoma cells, and in BHK cells. Our data suggest that His-55 is important for neurovirulence in older mice and acts by increasing the efficiency of virus replication.

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Selected References

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