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Development, Vol 118, Issue 1 255-266, Copyright © 1993 by Company of Biologists

JOURNAL ARTICLES

Drosophila hairy pair-rule gene regulates embryonic patterning outside its apparent stripe domains

M Lardelli and D Ish-Horowicz
Zoology Department, University of Oxford, England.

The hairy (h) segmentation gene of Drosophila regulates segmental patterning of the early embryo, and is expressed in a set of anteroposterior stripes during the blastoderm stage. We have used a set of h gene deletions to study the h promoter and the developmental requirements for individual h stripes. The results confirm upstream regulation of h striping but indicate that expression in the anterodorsal head domain depends on sequences downstream of the two transcription initiation sites. Surprisingly, the two anterior-most h domains appear to be dispensable for head development and embryonic viability. One partial promoter deletion expresses ectopic h, leading to misexpression of other segmentation genes and embryonic pattern defects. We demonstrate that h affects patterning outside its apparent stripe domains, supporting a model in which primary pair-rule genes act as concentration-dependent transcriptional regulators, i.e. as local morphogens.
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© The Company of Biologists Ltd 1993