Daughterless homodimer synergizes with Eyeless to induce Atonal expression and retinal neuron differentiation.

Daughterless homodimer synergizes with Eyeless to induce Atonal expression and retinal neuron differentiation.
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DOI:
10.1016/j.ydbio.2014.05.019
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发表时间:
2014-08-15
影响因子:
2.7
通讯作者:
Du, Wei
Du, Wei
中科院分区:
生物学3区
文献类型:
--
作者:
Tanaka-Matakatsu, Miho;Miller, John;Borger, Daniel;Tang, Wei-Jen;Du, Wei

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I类碱性螺旋-环-螺旋(BHLH)转录因子与II类bHLH蛋白形成同源二聚体或异二聚体。虽然已知bHLH异源二聚体具有不同的作用,但对I类同源二聚体的作用知之甚少。在这篇手稿中,我们展示了连接无子(Da)的二聚体,这是唯一的果蝇I类bHLH蛋白,与视网膜决定因子眼(Ey)协同激活无核(ATO)表达和视网膜神经元分化。与Da形成异二聚体的HLHExtramancheate(EMC)蛋白能拮抗Da的协同激活作用,但不能拮抗Da与Ey连接的二聚体的协同激活作用。我们发现Da直接与Ey相互作用,并促进Ey结合到ATO 3‘增强子中的Ey结合部位。有趣的是,ATO 3‘增强子中的Ey结合位点包含一个嵌入的E-box,这也是Ey和Da协同激活所必需的。最后,我们证明了Ey和Da的哺乳动物同源物可以在功能上取代它们的果蝇同源物来协同激活ATO增强子,这表明所观察到的功能是进化保守的。
Class I Basic Helix-Loop-Helix (bHLH) transcription factors form homodimers or heterodimers with class II bHLH proteins. While bHLH heterodimers are known to have diverse roles, little is known about the role of class I homodimers. In this manuscript, we show that linked a dimer of Daughterless (Da), the only Drosophila class I bHLH protein, activates Atonal (Ato) expression and retinal neuron differentiation synergistically with the retinal determination factor Eyeless (Ey). The HLH protein Extramacrocheate (Emc), which forms heterodimer with Da, antagonizes the synergistic activation from Da but not the Da-Da linked dimer with Ey. We show that Da directly interacts with Ey and promotes Ey binding to the Ey binding site in the Ato 3′ enhancer. Interestingly, the Ey binding site in the Ato 3′ enhancer contains an embedded E-box that is also required for the synergistic activation by Ey and Da. Finally we show that mammalian homologs of Ey and Da can functionally replace their Drosophila counterparts to synergistically activate the Ato enhancer, suggesting that the observed function is evolutionary conserved.
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