1887

Abstract

The emerging arbovirus Chandipura virus (CV) has been implicated in epidemics of acute encephalitis in India with high mortality rates. The isolation of temperature-dependent host-range (CE) mutants, which are impaired in growth at 39 °C in chick embryo (CE) cells but not in monkey cells, highlights a dependence on undetermined host factors. We have characterized three CE mutants, each containing one or more coding mutations in the RNA polymerase gene and two containing additional mutations in the attachment protein gene. Using reverse genetics, we showed that a single amino acid change in the virus polymerase of each mutant was responsible for the host-range specificity. In CE cells at the non-permissive temperature, the discrete cytoplasmic replication complexes seen in mammalian cells or at the permissive temperature in CE cells were absent with the CE mutants, consistent with the CE lesions causing disruption of the replication complexes in a host-dependent manner.

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2014-01-01
2019-11-22
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