Doublesex regulates male-specific differentiation during distinct developmental time windows in a parasitoid wasp

Yidong Wang, Anna H. Rensink, Ute Fricke, Megan C. Riddle, Carol Trent, Louis van de Zande, Eveline C. Verhulst*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Sexually dimorphic traits in insects are subject to sexual selection, but our knowledge of the underlying molecular mechanisms is still scarce. Here we investigate how the highly conserved gene, Doublesex (Dsx), is involved in shaping sexual dimorphism in the model parasitoid wasp Nasonia vitripennis (Hymenoptera: Pteromalidae). First, we present the revised Dsx gene structure including an alternative transcription start, and two additional male NvDsx transcript isoforms. We show sex-specific NvDsx expression and splicing throughout development, and demonstrate that transient NvDsx silencing in different male developmental stages shifts two sexually dimorphic traits from male to female morphology, with the effect being dependent on the timing of silencing. In addition, we determined the effect of NvDsx on the development of reproductive organs. Transient silencing of NvDsx in early male larvae affects the growth and differentiation of the internal and external reproductive tissues. We did not observe phenotypic changes in females after NvDsx silencing. Our results indicate that male NvDsx is required to suppress female-specific traits and/or to promote male-specific traits during distinct developmental windows. This provides new insights into the regulatory activity of Dsx during male wasp development in the Hymenoptera.

Original languageEnglish
Article number103724
JournalInsect Biochemistry and Molecular Biology
Volume142
DOIs
Publication statusPublished - Mar 2022

Keywords

  • Doublesex
  • Nasonia
  • Parasitoid wasps
  • Sex determination
  • Sexual differentiation
  • Sexually dimorphic traits

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