The function and evolution of the halloween genes: the pathway to the arthropod molting hormone
The virus Egf gene encodes an enzyme that modifies a hydroxyl group on 20E, thereby inactivating the molting hormone
and resulting in a delay or in the absence of molting in infected larvae (O'Reilly et al.
CYP314A1, designated shade in Drosophila, is a 20-hydroxylase responsible for the conversion of ecdysone to active molting hormone
, 20-hydroxyecdysone (Rewitz et al.
commercial product to mimic the natural molting hormone
The ultimate goal--a baculovirus genetically engineered to infect a gypsy moth with large amounts of brain proteins that disrupt its normal molting hormone
production--is probably years away.
This insecticide mimics the action of the molting hormone
ecdysone, thus triggering premature molting of immature lifestages, particularly of Lepidoptera larvae.
Levels of the molting hormone
, ecdysone, were quantitated, using a radioimmunoassay (RIA), in hemolymph of animals exhibiting shell disease.
Granted, their reproduction is not regulated by steroids, but ecdysone, the molting hormone
, is certainly a steroid.
In arthropods, the molting hormone
, ecdysone, is a steroid that is mimicked in some plants (34).
It modifies the response to the molting hormone
, 20-hydroxyecdysone, at the molecular, cellular and organismal level.
Molting and reproduction in grass shrimp are controlled by the molting hormone
, ecdysone (2,3).
The egt gene produces an enzyme that inactivates one of the caterpillar's molting hormones
and leads to climbing.