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• W2161939072 startingPage "1256" @default.
• W2161939072 abstract "The developmental events occurring during moulting and metamorphosis of insects are controlled by precisely timed changes in levels of ecdysteroids, the moulting hormones. The final four sequential hydroxylations of steroid precursors into the active ecdysteroid of insects, 20E (20-hydroxyecdysone), are mediated by four cytochrome P450 (P450) enzymes, encoded by genes in the Halloween family. Orthologues of the Drosophila Halloween genes phantom (phm; CYP306A1), disembodied (dib; CYP302A1), shadow (sad; CYP315A1) and shade (shd; CYP314A1) were obtained from the endocrinological model insect, the tobacco hornworm Manduca sexta. Expression of these genes was studied and compared with changes in the ecdysteroid titre that controls transition from the larval to pupal stage. phm, dib and sad, which encode P450s that mediate the final hydroxylations in the biosynthesis of ecdysone, were selectively expressed in the prothoracic gland, the primary source of ecdysone during larval and pupal development. Changes in their expression correlate with the haemolymph ecdysteroid titre during the fifth (final) larval instar. Shd, the 20-hydroxylase, which converts ecdysone into the more active 20E, is expressed in tissues peripheral to the prothoracic glands during the fifth instar. Transcript levels of shd in the fat body and midgut closely parallel the enzyme activity measured in vitro. The results indicate that these Halloween genes are transcriptionally regulated to support the high biosynthetic activity that produces the cyclic ecdysteroid pulses triggering moulting." @default.
• W2161939072 created "2016-06-24" @default.
• W2161939072 creator A5020125684 @default.
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• W2161939072 date "2006-10-25" @default.
• W2161939072 modified "2023-10-09" @default.
• W2161939072 title "The Halloween genes code for cytochrome P450 enzymes mediating synthesis of the insect moulting hormone" @default.
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• W2161939072 doi "https://doi.org/10.1042/bst0341256" @default.
• W2161939072 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17073797" @default.
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