1887

Abstract

DNA replication and transcription of NeabNPV, the nucleopolyhedrovirus (NPV) of the balsam fir sawfly, (Hymenoptera: Diprionidae), in host larvae were investigated. NPV DNA replication kinetics and gene-expression patterns have been resolved only in lepidopteran cell-culture systems and in limited experiments with lepidopteran larvae. Furthermore, there are significant differences in pathologies caused by lepidopteran NPVs, which replicate in many tissues, and hymenopteran NPVs, known to replicate in midgut epithelium only. Despite the differences in host specificity and pathology, NeabNPV DNA replication kinetics were similar to those reported for lepidopteran NPVs. Maximal NeabNPV DNA synthesis was observed between 4 and 24 h post-inoculation (p.i.) but, in contrast to lepidopteran NPVs, synthesis continued at a lower rate up to 72 h p.i. Selected NeabNPV genes exhibited a cascade pattern of transcription similar to that of lepidopteran NPVs. RT-PCR products of the NeabNPV , and transcripts were observed as early as 2 h p.i., whilst and , encoding putative viral RNA polymerase subunits, were detected at 1 and 6 h p.i., respectively. Two structural late transcripts ( and ) were observed from 6 h p.i. The very late factor 1 () transcript, a transactivator of very late genes, was observed from 12 h p.i., but the very late transcript , encoding the major occlusion protein, polyhedrin, was observed from 24 h p.i. This study provides the first insight into DNA replication and gene expression of a non-lepidopteran baculovirus.

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2007-07-01
2019-11-22
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vol. , part 7, pp. 1945 – 1951

Primers used in real-time qPCR and RT-PCR [ PDF] (82 KB)



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