Journal
EMBO REPORTS
Volume 14, Issue 6, Pages 561-567Publisher
WILEY
DOI: 10.1038/embor.2013.50
Keywords
doublesex; Trypoxylus dichotomus; exaggerated horn; sexual dimorphism; sexual selection
Categories
Funding
- [23128505]
- [19658020]
- Grants-in-Aid for Scientific Research [23128505, 22370008] Funding Source: KAKEN
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Male-specific exaggerated horns are an evolutionary novelty and have diverged rapidly via intrasexual selection. Here, we investigated the function of the conserved sex-determination gene doublesex (dsx) in the Japanese rhinoceros beetle (Trypoxylus dichotomus) using RNA interference (RNAi). Our results show that the sex-specific T. dichotomus dsx isoforms have an antagonistic function for head horn formation and only the male isoform has a role for thoracic horn formation. These results indicate that the novel sex-specific regulation of dsx during horn morphogenesis might have been the key evolutionary developmental event at the transition from sexually monomorphic to sexually dimorphic horns.
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