... adverse environments. In many insects, including the fruit fly, Drosophila melanogaster , reproductive diapause, also frequently called reproductive dormancy, is induced under low-temperature and short-day conditions by the downregulation of juvenile hormone (JH) biosynthesis in the corpus allatum (CA...

... for the successful reproduction of adult females. The endocrinal and nutritional regulation of vitellogenesis differs distinctly in insects. Here, the complex crosstalk between juvenile hormone (JH) and the two nutrient sensors insulin/IGF signaling (IIS) and target of rapamycin complex1 (TORC1), was investigated...

...Zhongxia Wu; Qiongjie He; Baojuan Zeng; Haodan Zhou; Shutang Zhou ABSTRACT Vitellogenin (Vg) is a prerequisite for egg production and embryonic development after ovipositioning in oviparous animals. In many insects, juvenile hormone (JH) promotes fat body cell polyploidization for the massive Vg...

...Jiasheng Song; Wanwan Li; Haihong Zhao; Lulu Gao; Yuning Fan; Shutang Zhou ABSTRACT Krüppel-homolog 1 (Kr-h1), a zinc-finger transcription factor, inhibits larval metamorphosis and promotes adult reproduction by transducing juvenile hormone (JH). Although the transcriptional regulation of Kr-h1 has...

...Ana Fernandez-Nicolas; Xavier Belles The role of juvenile hormone (JH) in insect embryos is far from understood, especially in short germ-band hemimetabolan species. To shed light on this issue, we depleted the mRNA levels of Krüppel homolog 1, Methoprene-tolerant and JH acid O -methyltransferase...

...Lynn M. Riddiford; James W. Truman; Christen K. Mirth; Yu-chi Shen To elucidate the role of juvenile hormone (JH) in metamorphosis of Drosophila melanogaster , the corpora allata cells, which produce JH, were killed using the cell death gene grim. These allatectomized (CAX) larvae were smaller...

...Ying Liu; Zhentao Sheng; Hanhan Liu; Di Wen; Qianyu He; Sheng Wang; Wei Shao; Rong-Jing Jiang; Shiheng An; Yaning Sun; William G. Bendena; Jian Wang; Lawrence I. Gilbert; Thomas G. Wilson; Qisheng Song; Sheng Li Juvenile hormone (JH) regulates many developmental and physiological events in insects...

... remodeling and death, all of which are orchestrated by the morphogenesis-promoting ecdysteroids and the antagonistically acting juvenile hormone (JH), whose presence precludes the metamorphic changes. How target tissues interpret this combinatorial effect of the two hormonal cues is poorly understood, mainly...

... instar. Application of hydroprene, a juvenile hormone analog, during the penultimate instar caused a repeat of the penultimate br expression patterns, and the formation of supernumerary larvae. Use of dsRNA against the br core region, or against a pair of either the br-Z2 or br-Z3 isoform with the br-Z1...

... by high juvenile hormone (JH)titers. Recently, a status quo hexamerin mechanism was identified, which reduces JH efficacy and maximizes colony fitness via the maintenance of high worker-caste proportions. Our goal in these studies was to investigate more thoroughly the influences of the hexamerins on JH...

..., the synapses connecting specific neurosecretory cells to the corpora allata are affected. The corpus allatum is part of the ring gland and is involved in the control of juvenile hormone titers during development. Our genetic and pharmacological results indicate that Fas2 spin rotation defects are linked...

...Xiaofeng Zhou; Lynn M. Riddiford The understanding of the molecular basis of the endocrine control of insect metamorphosis has been hampered by the profound differences in responses of the Lepidoptera and the Diptera to juvenile hormone (JH). In both Manduca and Drosophila , the broad ( br ) gene...

... programmed cell death during Drosophila metamorphosis . Development 124 , 4673 – 4683 . Jones , G. and Sharp , P. A. ( 1997 ). Ultraspiracle: An invertebrate nuclear receptor for juvenile hormones . Proc. Natl. Acad. Sci. USA 94 , 13499 – 13503 . Karim , F. D...

...Mary Bownes; Ann Scott; Alan Shirr As The three yolk proteins of Drosophila melanogaster begin to be synthesized at eclosion. Transcription of the genes is regulated by the genes tra, tra-2 and dsx and also by the insect hormones, juvenile hormone and 20-hydroxyecdysone. We show that there is yet...