Abstract
Infection of an insect by a baculovirus occurs in two distinct phases, an initial infection of host midgut by occlusion-derived virions (ODVs) and subsequent systemic infection of other tissues by budded virions (BV). A vast majority of investigations of the infection process have been restricted to cell culture studies using BV that emulate the systemic phase of infection. This is one of the first studies to investigate baculovirus gene expression in ODV infected midgut cells. We have focused on the critical first phase of in vivo infection by Mamestra configurata nucleopolyhedrovirus-A in M. configurata larvae, using qPCR and RNAseq mass sequencing to measure virus gene expression in midgut cells. The earliest genes detected by each method had significant overlap, including known early genes as well as genes unique to MacoNPV-A and genes of unknown function. The RNAseq data also revealed a large range of expression levels across all ORFs, which could not be measured using qPCR. This dataset provides a first whole genome transcriptomic analysis of viral genes required for virus infection in vivo and will provide the basis for functionally analyzing specific genes that may be critical elements in baculovirus midgut infectivity and host range.
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Acknowledgments
This work was funded by Agriculture and Agri-Food Canada through the Canadian Crop Genomics Initiative (Project #2613). We thank Sean Taylor from Bio-Rad Laboratories for discussions on the qPCR strategies, Carol Richardson for assistance with data processing in Excel, and Stephanie Harris and Ruwandi Andrahennadi for technical assistance and insect rearing support. We also thank internship students from the University of Western Ontario, Daniel Zigler, Joanna Konopka, and Katrina Bruch, for qPCR set-up.
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Supplementary material 1
Primers for qPCR of all MacoNPV-A ORFs and M. configurata reference genes. Format XLS (XLSX 24 kb)
Supplementary material 3
Expression values for midgut samples derived by RNAseq. The sheet shows the number of reads detected at each time point as well as the amount relative to the amount at 48 hpi, which was used to derive the percent sum stacks in Fig 3. Format XLS (XLSX 27 kb)
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Donly, B.C., Theilmann, D.A., Hegedus, D.D. et al. Mamestra configurata nucleopolyhedrovirus-A transcriptome from infected host midgut. Virus Genes 48, 174–183 (2014). https://doi.org/10.1007/s11262-013-0986-z
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DOI: https://doi.org/10.1007/s11262-013-0986-z