Evaluating the evolution and function of the dynamic Venom Y protein in ectoparasitoid wasps

Area of Science:

• Evolutionary biology
• Insect toxicology
• Molecular parasitology

Background:

• Parasitoid wasp venom alters host metabolism and gene expression.
• The venom of ectoparasitoid wasps remains largely uncharacterized.
• A major, uncharacterized protein in *Nasonia vitripennis* venom is termed Venom Y.

Purpose of the Study:

• To investigate the evolutionary history and functions of the parasitoid venom protein, Venom Y.
• To understand Venom Y's role within the complex venom cocktail.
• To elucidate the molecular mechanisms of venom-host interactions.

Main Methods:

• Comparative genomics to trace the evolutionary history of Venom Y.
• RNA interference (RNAi) knockdown to assess venom protein function in vivo.
• Protein sequencing to identify post-translational modifications.
• Analysis of gene expression changes in host tissues.

Main Results:

• Venom Y is a recently evolved gene with duplicated paralogues, recruited as a venom protein in at least five wasp species.
• Venom Y influences detoxification and immunity genes in host flies, particularly in fat body tissue.
• Evidence suggests Venom Y can mitigate negative effects of other venom proteins.
• Post-translational modifications were detected in Venom Y.

Conclusions:

• Venom Y plays a significant role in modulating host immunity and metabolism, likely targeting the fat body.
• This study highlights the utility of RNAi in dissecting complex venom functions within the context of the entire venom cocktail.
• Understanding Venom Y contributes to the broader characterization of parasitoid venoms and their evolutionary adaptations.