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Genetics, Vol 144, 159-170, Copyright © 1996
INVESTIGATIONS |
The Drosophila Eip78C Gene Is Not Vital But Has a Role in Regulating Chromosome Puffs
SRH. Russell, G. Heimbeck, C. M. Goddard, ATC. Carpenter and M. Ashburner
Department of Genetics, University of Cambridge, Cambridge CB2 3EH, United Kingdom
We have generated a number of chromosomal aberrations that disrupt the early-late ecdysone-induced 78C puff gene (Eip78C, ecdysone-induced protein, FlyBase name for the E78 gene of STONE and THUMMEL 1993), which encodes the two members of the nuclear hormone receptor superfamily Eip78C-A and Eip78C-B. The aberrations include deletions of the ligand-binding/dimerization domain of both, inversions that split Eip78C-A but retain residual Eip78C-B expression, and a small deletion specific for Eip78C-B. We find that wild-type Eip78C functions are completely dispensable for normal development under laboratory conditions. However, we show that Eip78C-B is required for the maximal puffing activity of a subset of late puffs (63E and 82F) since these puffs are reduced in size in Eip78C-B mutant backgrounds. Paradoxically the same late puffs are reduced, as well as at least one other, when the Eip78C-B cDNA is overexpressed from a heat shock promoter. These data indicate either that Eip78C function is redundant or that it plays a subtle modulating role in the regulation of chromosome puffing.
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