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The ecdysone-induced bZIP transcription factor MafB establishes a positive feedback loop to enhance vitellogenesis and reproduction in the mosquito.
Proc Natl Acad Sci U S A
January 2025
Department of Entomology, University of California, Riverside, CA 92521.
Female mosquitoes require a vertebrate blood meal to activate reproduction, transmitting numerous devastating human diseases. Vitellogenesis is a central event of female reproduction that involves the massive production of vitellogenin (Vg) in the fat body and the maturation of ovaries. This process is controlled by the steroid hormone 20-hydroxyecdysone (20E); however, its molecular regulatory basis remains not completely understood.
View Article and Find Full Text PDFCharacterization of an Ecdysone Oxidase from (L.) and Its Role in Bt Cry1Ac Resistance.
J Agric Food Chem
January 2025
State Key Laboratory of Vegetable Biobreeding, Department of Plant Protection, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Understanding the molecular mechanisms underlying insect resistance to (Bt) pesticidal proteins is crucial for sustainable pest management. Here, we found that downregulation of the ecdysone oxidase gene () in the normal feeding stages contributes to increased 20-hydroxyecdysone (20E) titer and mediates resistance to the Bt Cry1Ac toxin. The gene was cloned and its expression was significantly downregulated in the midgut of Bt-resistant and Cry1Ac-selected .
View Article and Find Full Text PDF20-Hydroxyecdysone Mediates Reproductive Diapause in via Ecdysone Receptor and Nuclear Hormone Receptor .
Int J Mol Sci
December 2024
Research Center for Grassland Entomology, Inner Mongolia Agricultural University, Hohhot 010020, China.
20-hydroxyecdysone (20E) signaling plays an important role in regulating insect growth, development, and reproduction. However, the effect of 20E on reproductive diapause and its regulatory mechanisms have not been fully understood. is a new pest in the Inner Mongolia grasslands, and it aestivates in an obligatory reproductive diapause form.
View Article and Find Full Text PDFNovel regulation pathway of eclosion hormones in Tribolium castaneum by distinct transcription factors through the initiation of 20-hydroxyecdysone.
J Biol Chem
November 2024
College of Life Sciences, Nanjing Normal University, Nanjing, China. Electronic address:
Eclosion hormone (EH) is not only a key trigger of insect ecdysis, but is also involved in the regulation of important physiological processes such as development, diapause, metamorphosis, and reproduction. EH is an ideal target for RNAi treatment and prevention of the Tribolium castaneum. However, two EH genes in T.
View Article and Find Full Text PDFLarval development of a parasitoid depends on host ecdysteroids.
Insect Biochem Mol Biol
November 2024
School of Life Sciences, Suzhou Medical College of Soochow University, Suzhou, Jiangsu, 215123, China; Sericulture Institute of Soochow University, Suzhou, Jiangsu, 215123, China. Electronic address:
Parasitoids often exhibit high flexibility in their development depending on stages of their host at the parasitism, yet little is known about the mechanism underlying such flexibility. In the study, we evaluated the larval development time of the parasitoid Exorista sorbillans (Diptera: Tachinidae) on the lepidopteran model insect Bombyx mori (Lepidoptera: Bombycidae). We found that the development duration of E.
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