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JAK/STAT controls organ size and fate specification by regulating morphogen production and signalling.

Nat Commun. 2017 Jan 03;8:13815
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摘要


A stable pool of morphogen-producing cells is critical for the development of any organ or tissue. Here we present evidence that signalling in the Drosophila wing promotes the cycling and survival of Hedgehog-producing cells, thereby allowing the stable localization of the nearby BMP/Dpp-organizing centre in the developing wing appendage. We identify the inhibitor of apoptosis dIAP1 and Cyclin A as two critical genes regulated by JAK/duanyu1813 and contributing to the growth of the Hedgehog-expressing cell population. We also unravel an early role of JAK/duanyu1813 in guaranteeing Wingless-mediated appendage specification, and a later one in restricting the Dpp-organizing activity to the appendage itself. These results unveil a fundamental role of the conserved JAK/duanyu1813 pathway in limb specification and growth by regulating morphogen production and signalling, and a function of pro-survival cues and mitogenic signals in the regulation of the pool of morphogen-producing cells in a developing organ.

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