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Submitted on December 18, 2002
Accepted on July 15, 2003
1 Howard Hughes Medical Institute, Department of Human Genetics, University of Utah School of Medicine, 15 N 2030 E Rm 5100, University of Utah, Salt Lake City, UT 84112-5331, USA
* To whom correspondence should be addressed.
The recent completion of the Drosophila genome sequence revealed 21 members of the nuclear receptor superfamily. Many of these genes are transcriptionally regulated by the steroid hormone ecdysone and play a role during the onset of metamorphosis, including the EcR/USP ecdysone receptor heterodimer. As a first step toward a genomic analysis of this gene family, we have characterized the temporal patterns of expression for all detectable nuclear receptor transcripts throughout major ecdysone-regulated developmental transitions in the life cycle: embryogenesis, a larval molt, puparium formation, and the prepupal-pupal transition. Unexpectedly, we find a close temporal relationship between DHR3, E75B, and 
FTZ-F1 expression after each major ecdysone pulse examined, reflecting their known cross-regulatory interactions in prepupae and suggesting that these genes act together at other stages in the life cycle. In addition, E75A, E78B, and DHR4 are expressed in a reproducible manner with DHR3, E75B, and FTZ-F1, suggesting that they intersect with this regulatory cascade. Finally, we find that known ecdysone-inducible primary-response transcripts are coordinately induced at times when the ecdysteroid titer is low, implying the existence of novel, as yet uncharacterized, temporal signals in Drosophila.
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