Abstract
Polydnaviruses (PDVs) are unusual viruses, divided into Bracoviruses (BVs) and Ichnoviruses (IVs), mutualistically associated with parasitoid wasps. BVs and IVs derive from two independent events of virus genome integration during parasitoid evolution but share a common life cycle: virus particles are produced exclusively in female wasp ovaries, then injected into the parasitoid host during oviposition. PDVs are necessary for successful parasitoid development within their hosts. PDV genomes are maintained integrated in wasp chromosomes in two forms: the proviral segments, that serve as template to produce the typical PDV polydisperse packaged genome, and the “replication genes”, that are not packaged but involved in the production of the virus particles.
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