Applied Entomology and Zoology

, Volume 53, Issue 3, pp 381–393 | Cite as

Deficiency in dmrt99B ortholog causes behavioral abnormalities in the silkworm, Bombyx mori

  • Ryota Kasahara
  • Fugaku Aoki
  • Masataka G. SuzukiEmail author
Original Research Paper


Doublesex-mab3-related transcription factor (DMRT) genes encode a family of transcription factors that are conserved among phyla. DMRTs are related to sex determination or differentiation. However, several DMRTs, known as DMRTAs, are irrelevant to sex determination and sexual differentiation, but play an important role in neurogenesis in diverse animal species. In this study, we identified a Bombyx ortholog of an arthropod-specific DMRT, dmrt99B (designated Bmdmrt99B), and characterized its function. Bmdmrt99B was preferentially expressed in the ovary and brain of larvae. The food-seeking ability of the larvae of two Bmdmrt99B mutant strains was disrupted, which decreased their food intake. The Bmdmrt99B mutant larvae also showed abnormal scattering behavior. Moreover, mutant adult males responded to the female sex pheromone but could not localize its source. Our findings suggest that the neurogenetic function of DMRT is conserved among insect species and that DMRT plays an important role in the regulation of normal behaviors in insects.


Bombyx mori DMRT dmrt99B Behavior CRISPR/Cas9 



This work was supported by a Grant-in-Aid for Scientific Research (B), 17H03940, 2017.

Supplementary material

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Supplementary material 2 (MP4 32800 kb)

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Copyright information

© The Japanese Society of Applied Entomology and Zoology 2018

Authors and Affiliations

  • Ryota Kasahara
    • 1
  • Fugaku Aoki
    • 1
  • Masataka G. Suzuki
    • 1
    Email author
  1. 1.Department of Integrated Biosciences, Graduate School of Frontier SciencesThe University of TokyoKashiwa-shiJapan

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