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Cell dynamics underlying oriented growth of the Drosophila wing imaginal disc

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Item Type:Article
Title:Cell dynamics underlying oriented growth of the Drosophila wing imaginal disc
Creators Name:Dye, N.A., Popović, M., Spannl, S., Etournay, R., Kainmüller, D., Ghosh, S., Myers, E.W., Jülicher, F. and Eaton, S.
Abstract:Quantitative analysis of the dynamic cellular mechanisms shaping the Drosophila wing during its larval growth phase has been limited, impeding our ability to understand how morphogen patterns regulate tissue shape. Such analysis requires explants to be imaged under conditions that maintain both growth and patterning, as well as methods to quantify how much cellular behaviors change tissue shape. Here, we demonstrate a key requirement for the steroid hormone 20-hydroxyecdysone (20E) in the maintenance of numerous patterning systems in vivo and in explant culture. We find that low concentrations of 20E support prolonged proliferation in explanted wing discs in the absence of insulin, incidentally providing novel insight into the hormonal regulation of imaginal growth. We use 20E-containing media to observe growth directly and to apply recently developed methods for quantitatively decomposing tissue shape changes into cellular contributions. We discover that whereas cell divisions drive tissue expansion along one axis, their contribution to expansion along the orthogonal axis is cancelled by cell rearrangements and cell shape changes. This finding raises the possibility that anisotropic mechanical constraints contribute to growth orientation in the wing disc.
Keywords:Ecdysone, Insulin, Culture, Imaginal Disc, Proliferatio, Animals, Drosophila melanogaster
Publisher:Company of Biologists
Page Range:4406-4421
Date:1 December 2017
Additional Information:Copyright © 2017 The Authors. Published by The Company of Biologists Ltd.
Official Publication:https://doi.org/10.1242/dev.155069
PubMed:View item in PubMed

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