This is in sharp contrast with our results. We explain the differences by the low resolution of the microarray technique that Wagner et al. used for their analysis. An analysis of the global transcription of Rhesus monkey rhadinovirus, a γ-herpesvirus, has revealed differential gene expression at different MOIs [48], but these data cannot be compared because they related to later time

points (12, 24, 48 72 and 96 h) than in our analysis. Figure 3 Heatmap-like representation of the ratio of Trichostatin A cost transcripts produced in the low-MOI and high MOI selleck products infection (R t low MOI/ R t high MOI ). PK-15 cells were infected with the PRV-Ka strain at different MOIs (0.1 and 10). Real-Time PCR data were normalised to 28 S RNAs. The Rlow/Rhigh values are

plotted in a heat map-like manner. Black boxes indicate the highest ratio, and dark-red boxes the lowest values. White boxes demonstrate approximately equal values. Figure 4 buy MK-8776 The ratio of ie180 and ep0 mRNAs to their antisense partners. The continuous lines illustrate the ratio of ie180 mRNA to AST, while the dotted lines represent the ratio of ep0 mRNA to LAT at the low- and high-MOI infections. Figure 5 The R values of ie180 and ep0 mRNAs and their antisense partners. These diagrams depict the expression curves of sense and antisense transcripts of two regulatory genes (ie180 and ep0) at the different infectious doses. The continuous lines represent the level of sense transcripts at the given time points, while broken lines show the amounts of their antisense counterparts. Conclusion Our analysis has revealed that almost all of the examined PRV genes exhibited different expression dynamics under the two experimental conditions. Most PRV genes were expressed

at a lower level in the low-MOI than in the high-MOI experiment in the early stages of infection; however, the reverse was true when the transcript levels were normalized to the genome copy numbers. In the low-MOI infection, slightly more than half of the PRV transcripts outran the high-MOI values by 6 h pi. The lower ie180 transcript per genome in the high-titre infection experiment might account for the lower level Avelestat (AZD9668) of global PRV gene expression per genome in the high-MOI infection. However, the expression of viral genes per DNA did not uniformly decrease; some genes even became more active in the high-MOI infection, which indicates the selective effect of the reduced availability of the IE180 protein. The most dramatic difference between the two MOI infections was observed in AST, which was expressed at a more than two log higher level in an infected cell in the low-MOI infection, which is a 3 log higher activity of a single DNA region encoding the ASP. The ratio of LAT/EP0 was also significantly lower in the high-than in the low-MOI infection. The reasons for and the mechanisms of these phenomena remain to be clarified.