Background: 20-Hydroxyecdysone (20E) and juvenile hormone (JH) coordinately control insect molting and metamorphosis. Results: Induced by 20E and suppressed by JH, E93 acts through GAGA-containing motifs and up-regulates a subset of 20E response genes. Conclusion: E93 transcriptionally modulates 20E signaling to promote Bombyx metamorphosis. Significance: Our study helps in understanding the complicated molecular mechanisms of insect metamorphosis.
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