Establishment of medial fates along the proximodistal axis of the Drosophila leg through direct activation of dachshund by Distalless.

Establishment of medial fates along the proximodistal axis of the Drosophila leg through direct activation of dachshund by Distalless.
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DOI:
10.1016/j.devcel.2011.03.017
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发表时间:
2011-04-19
期刊:
影响因子:
11.8
通讯作者:
Mann, Richard S.
Mann, Richard S.
中科院分区:
生物学1区
文献类型:
--
作者:
Giorgianni, Matt W.;Mann, Richard S.

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果蝇腿的近远端 (PD) 轴被认为是由两种分泌的形态发生素 Wingless (Wg) 和 Decapentaplegic (Dpp) 的组合梯度建立的。根据该模型,高 [Wg+Dpp] 激活远端 (Dll) 并抑制腿盘远端细胞中的腊肠犬 (dac),而中 [Wg+Dpp] 激活内侧组织中的 dac。为了测试这个模型,我们鉴定并表征了一个 dac 顺式调节元件(dac RE),它概括了腿部发育过程中 dac 的内侧表达域。与梯度模型相反,我们发现 Wg 和 Dpp 并不以分级方式激活 RE。相反,dac RE 直接被 Dll 激活,并被包括同源结构域蛋白 Bar 在内的多种因子组合在远端抑制。因此,内侧腿的命运是通过级联调节建立的,其中Wg+Dpp激活Dll,然后Dll直接激活dac,而Wg+Dpp作为不太关键的、允许的输入。
The proximo-distal (PD) axis of the Drosophila leg is thought to be established by the combined gradients of two secreted morphogens, Wingless (Wg) and Decapentaplegic (Dpp). According to this model, high [Wg+Dpp] activates Distalless (Dll) and represses dachshund (dac) in the distal cells of the leg disc while intermediate [Wg+Dpp] activates dac in medial tissue. To test this model we identified and characterized a dac cis-regulatory element (dac RE) that recapitulates the dac’s medial expression domain during leg development. Counter to the gradient model, we find that Wg and Dpp do not act in a graded manner to activate RE. Instead, dac RE is activated directly by Dll and repressed distally by a combination of factors including the homeodomain protein Bar. Thus, medial leg fates are established via a regulatory cascade in which Wg+Dpp activate Dll and then Dll directly activates dac, with Wg+Dpp as less critical, permissive inputs.
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