Robustness of the Dpp morphogen activity gradient depends on negative feedback regulation by the inhibitory Smad, Dad

Yuri Ogiso, Kazuhide Tsuneizumi, Naoki Masuda, Makoto Sato, Tetsuya Tabata*

*この研究の対応する著者

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Developmental patterning relies on morphogen concentration gradients, which generally provide invariable positional information despite genetic fluctuations. Theoretical studies have predicted robust patterning; however, little experimental evidence exists to support this idea. In this report, we examine the robustness of the Decapentaplegic (Dpp) (a Drosophila homologue of bone morphogenetic protein [BMP]) activity gradient in the presence of fluctuations in Dpp receptor levels. Dpp activity can be measured by the degree of phosphorylation of Mothers against dpp (Mad), a major signal transducer. We determined that phosphorylated Mad (pMad) levels remain constant when an extra copy of thickveins (tkv), which encodes the receptor, is introduced into the wild-type background. Higher Tkv levels, expressed under the control of an artificial promoter, result in constant pMad levels. This prompted us to study the mechanisms that underlie pMad level maintenance even when Tkv levels are increased. We focused on the inhibitory Smad, daughters against dpp (dad), which is induced by Dpp signaling and negatively regulates Dpp activity. In the absence of dad, pMad levels significantly increase when Tkv levels increase. These results suggest that Dpp activity gradient robustness when Tkv levels increase depends, at least in part, on negative feedback regulation by dad.

本文言語English
ページ(範囲)668-678
ページ数11
ジャーナルDevelopment Growth and Differentiation
53
5
DOI
出版ステータスPublished - 2011 6
外部発表はい

ASJC Scopus subject areas

  • 発生生物学
  • 細胞生物学

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