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Parasitoid Virus

Parasitoid wasps are engaged in an evolutionary arms race with their herbivorous hosts. In many ichneumonid and braconid wasps, including Cotesia congregata, parasitoid adaptations to hosts involve species-specific symbiotic polydnaviruses (PDVs) that disrupt host physiology and endocrinology. PDVs are integrated into the wasp genome, produced in the female reproductive system and injected with eggs during oviposition. PDVs modify host immune responses to parasitism via virulent gene expression. In the absence of a functional PDV, parasitoid wasp eggs are encapsulated and killed. This video was produced by Justin Bredlau (PhD student), Jessica Bray (MS graduate), Kanchan Joshi (MS student), and Emily Euto (undergraduate student) in Dr. Karen Kester’s laboratory at Virginia Commonwealth University.