In insects, the steroid hormone ecdysone controls the timing of moulting and metamorphosis. Some enzymes involved in ecdysone biosynthesis from dietary cholesterol have been identified but not those for the conversion of 7-dehydrocholesterol to 5β-ketodiol, the so-called ‘Black Box’. Now, Ryusuke Niwa, Tetsuro Shinoda and co-workers report that non-molting glossy (nm-g)/shroud (sro) encodes a short-chain dehydrogenase/reductase that functions in this ecdysteroid biosynthesis Black Box (see p. 1991). The researchers first isolated nm-g by positionally cloning the silkworm nm-g mutant gene. This mutant has low ecdysteroid levels and developmentally arrests as a larva. Next, they discovered that the Drosophila mutant sro, which is a Drosophila Halloween-class embryonic lethal mutant, is caused by the loss of function of an nm-g orthologue. Finally, they report that the application of ecdysteroids or 5β-ketodiol, but not that of cholesterol or 7-dehydrocholesterol, reverses nm-g/sro mutant phenotypes. Thus, the researchers conclude, Nm-g/Sro is an essential, but as yet uncharacterised, component of the ecdysteroid biosynthesis Black Box.
Ecdysteroid synthesis ‘Black Box’ illuminated
Ecdysteroid synthesis ‘Black Box’ illuminated. Development 15 June 2010; 137 (12): e1202. doi:
Download citation file:
Advertisement
Cited by
Call for papers: Uncovering Developmental Diversity
Development invites you to submit your latest research to our upcoming special issue: Uncovering Developmental Diversity. This issue will be coordinated by our academic Editor Cassandra Extavour (Harvard University, USA) alongside two Guest Editors: Liam Dolan (Gregor Mendel Institute of Molecular Plant Biology, Austria) and Karen Sears (University of California Los Angeles, USA).
Choose Development in 2024
In this Editorial, Development Editor-in-Chief James Briscoe and Executive Editor Katherine Brown explain how you support your community by publishing in Development and how the journal champions serious science, community connections and progressive publishing.
Journal Meeting: From Stem Cells to Human Development
Register now for the 2024 Development Journal Meeting From Stem Cells to Human Development. Early-bird registration deadline: 3 May. Abstract submission deadline: 21 June.
Pluripotency of a founding field: rebranding developmental biology
This collaborative Perspective, the result of a workshop held in 2023, proposes a set of community actions to increase the visibility of the developmental biology field. The authors make recommendations for new funding streams, frameworks for collaborations and mechanisms by which members of the community can promote themselves and their research.
Read & Publish Open Access publishing: what authors say
We have had great feedback from authors who have benefitted from our Read & Publish agreement with their institution and have been able to publish Open Access with us without paying an APC. Read what they had to say.