首页> 美国卫生研究院文献>The EMBO Journal >The Broad-Complex directly controls a tissue-specific response to the steroid hormone ecdysone at the onset of Drosophila metamorphosis.
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The Broad-Complex directly controls a tissue-specific response to the steroid hormone ecdysone at the onset of Drosophila metamorphosis.

机译:果蝇变态发生时宽复合体直接控制对类固醇激素蜕皮激素的组织特异性反应。

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摘要

In Drosophila, all of the major metamorphic transitions are regulated by changes in the titer of the steroid hormone ecdysone. Here we examine how a key regulator of metamorphosis and primary ecdysone response gene, the Broad-Complex, transmits the hormonal signal to one of its targets, the Sgs-4 glue gene. We show that Broad-Complex RNAs accumulate in mid third instar larval salivary glands prior to Sgs-4 induction, as expected for the products of a gene that regulates the timing of Sgs-4 activation. The Broad-Complex codes for a family of zinc finger transcriptional regulators. We have identified a number of binding sites for these proteins in sequences known to regulate the timing of Sgs-4 induction, and have used these sites to derive a binding consensus for each protein. Some of these binding sites are required in vivo for Sgs-4 activity. In addition, rbp+, a genetically defined Broad-Complex function that is required for Sgs-4 induction, acts through these Broad-Complex binding sites. Thus, the Broad-Complex directly mediates a temporal and tissue-specific response to ecdysone as larvae become committed to metamorphosis.
机译:在果蝇中,所有主要的变态转变都由类固醇激素蜕皮激素的滴度变化来调节。在这里,我们研究了变态和主要蜕皮激素反应基因的关键调控因子Broad-Complex如何将激素信号传递至其靶标之一Sgs-4胶粘基因。我们显示,广泛复合RNA积累在Sgs-4诱导之前的第三龄幼虫幼虫唾液腺中,正如预期的调节Sgs-4活化时间的基因产物一样。 Broad-Complex编码一个锌指转录调节因子家族。我们已经确定了已知调控Sgs-4诱导时间的序列中这些蛋白的许多结合位点,并已使用这些位点得出了每种蛋白的结合共识。这些结合位点中的一些对于Sgs-4活性在体内是必需的。此外,rbp +是Sgs-4诱导所需的基因定义的广泛复合功能,通过这些广泛复合物结合位点起作用。因此,随着幼虫开始蜕变,宽复合体直接介导对蜕皮激素的时间和组织特异性反应。

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