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Microplitis demolitor is a polydnavirus-carrying wasp that parasitizes the larval stage of Pseudoplusia includens. A previous study indicated that M. demolitor polydnavirus (MdPDV) infects primarily hemocytes in parasitized hosts. Thereafter, several alterations that compromise the immune response of P. includens toward the developing parasitoid occur in hemocytes. In this study, we identified two MdPDV mRNAs (1.0 and 1.5 kb) expressed in P. includens hemocytes that have homology to the viral genomic clone pMd-2. Corresponding 1.0- and 1.5-kb cDNA clones (MdPi455 and MdPi59) were isolated from an MdPDV-infected hemocyte cDNA library. Nucleotide sequence analysis of the cDNA clones confirmed that the 1.5- and 1.0-kb mRNAs have significant regions of homology. Sequence alignment revealed that the gene, OMd1.0, encoding the 1.0-kb mRNA is present in pMd-2. This gene contains two introns and three exons that agree with the sequence for MdPi455. In contrast, the 1.5-kb mRNA is likely encoded by a related gene located on the same MdPDV genomic DNA as is OMd1.0. The predicted peptide sequences for the 1.0- and 1.5-kb transcripts contain a cysteine-rich region at their 5' ends that have some similarity with epidermal growth factor-like motifs. Hybridization studies revealed that both mRNAs are expressed in granular cells and plasmatocytes, the primary classes of hemocytes involved in defense against M. demolitor and other parasites.

Two Microplitis demolitor polydnavirus mRNAs expressed in hemocytes of Pseudoplusia includens contain a common cysteine-rich domain