The Hippo signalling pathway coordinates organ growth and limits developmental variability by controlling dilp8 expression.

The Hippo signalling pathway coordinates organ growth and limits developmental variability by controlling dilp8 expression.
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DOI:
10.1038/ncomms13505
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发表时间:
2016-11-22
影响因子:
16.6
通讯作者:
Leopold, Pierre
Leopold, Pierre
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Boone, Emilie;Colombani, Julien;Andersen, Ditte S.;Leopold, Pierre

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发育过程中器官生长的协调需要产生具有固定比例的健康个体。我们最近发现果蝇 Dilp8 是器官生长与动物成熟耦合的关键激素。此外,dilp8 突变果蝇表现出升高的波动不对称性 (FA),证明 Dilp8 在确保发育稳定性方面具有功能。正常发育过程中调节 Dilp8 活性的信号尚不清楚。在这里,我们发现 Hippo (Hpo) 途径的转录共激活因子 Yorkie (Yki、YAP/TAZ) 及其 DNA 结合伙伴 Scalloped (Sd) 通过 dilp8 启动子中的 Hpo 响应元件 (HRE) 直接调节 dilp8 表达。我们进一步证明,通过基因组编辑对 HRE 进行突变会导致动物的 FA 增加,从而模拟 dilp8 功能的完全丧失。因此,我们的结果表明,器官的生长协调通过涉及 Hpo 和 Dilp8 信号通路的反馈回路与其生长状态相关。 Dipl8 激素调节果蝇的器官生长,而 Hippo 通路则控制器官大小。在这里,作者表明 Dipl8 的表达受到 Hippo 通路的调节,从而将果蝇的器官生长或器官大小联系起来。
Coordination of organ growth during development is required to generate fit individuals with fixed proportions. We recently identified Drosophila Dilp8 as a key hormone in coupling organ growth with animal maturation. In addition, dilp8 mutant flies exhibit elevated fluctuating asymmetry (FA) demonstrating a function for Dilp8 in ensuring developmental stability. The signals regulating Dilp8 activity during normal development are not yet known. Here, we show that the transcriptional co-activators of the Hippo (Hpo) pathway, Yorkie (Yki, YAP/TAZ) and its DNA-binding partner Scalloped (Sd), directly regulate dilp8 expression through a Hpo-responsive element (HRE) in the dilp8 promoter. We further demonstrate that mutation of the HRE by genome-editing results in animals with increased FA, thereby mimicking full dilp8 loss of function. Therefore, our results indicate that growth coordination of organs is connected to their growth status through a feedback loop involving Hpo and Dilp8 signalling pathways. The hormone Dipl8 regulates organ growth in Drosophila whereas the Hippo pathway controls organ size. Here, the authors show that the expression of Dipl8 is regulated by the Hippo pathway, thus linking organ growth or organ size in Drosophila.
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