Volume 11, Issue 4 pp. 299-309
Article
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Characterization of IMP-E3, A gene active during imaginal disc morphogenesis in Drosophila melanogaster

John T. Moore

John T. Moore

Division of Genetics, Department of Molecular and Cell Biology, University of California, Berkeley

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Dianne Fristrom

Dianne Fristrom

Division of Genetics, Department of Molecular and Cell Biology, University of California, Berkeley

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Ann S. Hammonds

Ann S. Hammonds

Division of Genetics, Department of Molecular and Cell Biology, University of California, Berkeley

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James W. Fristrom

Corresponding Author

James W. Fristrom

Division of Genetics, Department of Molecular and Cell Biology, University of California, Berkeley

589 Life Science Addition, University of California, Berkeley, CA 94720Search for more papers by this author
First published: 1990
Citations: 13

Abstract

The steroid hormone 20-hydroxyecdysone (20-HE) induces imcainol discs to form adult appendages in Drosophila. We have isolated a set of six ecdysone-responsive genes that apparently encode disc cell-surface or secreted proteins. Transcripts from one of these genes, IMP-E3, accumulate rapidly within 1–2 h in response to hormone. Developmentally,IMP-E3 transcripts reach maximum levels during the first stages of metamorphosis (white prepupae, WPP) and are primarily limited to imaginal tissues. Transcripts are also present during embryogenesis (0–3 h and 12–18 h). Two different-sized transcripts (1.2 and 1.4 kb) result from differential polyadenylation, with the larger transcript predominating in WPP. The conceptual IMP-E3 protein contains a signal peptide, an RGD sequence, and a potential glycosylphosphatidylinositol anchor. We speculate that the protein provides a transient cue important for imaginal disc morphogenesis.

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