1887

Abstract

Rat virus (RV) is an important infectious agent of laboratory rats because of its high prevalence and capacity to disrupt research. Additionally, RV infection serves as a model for characterizing virus–host interactions during acute, persistent and prenatal infection. Our research has examined the pathogenesis of two RV strains, RV-UMass and RV-Y. RV-UMass is more pathogenic, causes a higher level of persistent infection and transmits to the foetus after oronasal inoculation of the pregnant dam. To determine distinctions between the strains that may account for these differences and to provide a benchmark for characterizing virus replication , synchronized replication of both RV strains was defined and compared. The results demonstrated that RV replication has replicative intermediates, virus transcripts and proteins similar to those reported for the prototype parvovirus, minute virus of mice. However, the replicative cycle of RV-UMass was 12 h compared with 24 h for RV-Y, and RV-UMass and RV-Y differed in kinetics of virus DNA replication, transcription and protein accumulation. Additionally, analysis correlated well with kinetics data as determined by Southern and Northern blot analysis. Sequence comparisons between the strains also determined coding differences that may contribute to phenotypic differences.

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2001-03-01
2020-01-17
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