Erect wing regulates synaptic growth in Drosophila by integration of multiple signaling pathways.

Erect wing regulates synaptic growth in Drosophila by integration of multiple signaling pathways.
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DOI:
10.1186/gb-2008-9-4-r73
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发表时间:
2008-04-17
期刊:
影响因子:
12.3
通讯作者:
Soller M
Soller M
中科院分区:
生物学1区
文献类型:
--
作者:
Haussmann IU;White K;Soller M

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突触连接的形成是一个动态和高度调节的过程。关于调节突触生长的基因网络以及它们如何平衡刺激和限制信号,我们知之甚少。在这里,我们表明,神经元表达的转录因子基因直立翼(ewg)的RNA结合蛋白ELAV的主要目标和EWG限制突触生长在神经肌肉接头。使用功能基因组学的方法,我们表明,EWG的行为主要是通过增加参与转录和转录后调控基因表达的基因的mRNA水平,而在调控表达层次结构(效应基因)的末端的基因仅代表一小部分,表明广泛的调控网络。在EWG调控的基因中,有Wingless和Notch信号通路的组成部分。在克隆分析中,我们证明了EWG在遗传上与Wingless和Notch相互作用,并且在突触生长的调节中与TGF-β和AP-1通路相互作用。我们的研究结果表明,EWG限制突触的生长,通过整合多种细胞信号通路到一个广泛的调控基因表达网络。
Formation of synaptic connections is a dynamic and highly regulated process. Little is known about the gene networks that regulate synaptic growth and how they balance stimulatory and restrictive signals. Here we show that the neuronally expressed transcription factor gene erect wing (ewg) is a major target of the RNA binding protein ELAV and that EWG restricts synaptic growth at neuromuscular junctions. Using a functional genomics approach we demonstrate that EWG acts primarily through increasing mRNA levels of genes involved in transcriptional and post-transcriptional regulation of gene expression, while genes at the end of the regulatory expression hierarchy (effector genes) represent only a minor portion, indicating an extensive regulatory network. Among EWG-regulated genes are components of Wingless and Notch signaling pathways. In a clonal analysis we demonstrate that EWG genetically interacts with Wingless and Notch, and also with TGF-β and AP-1 pathways in the regulation of synaptic growth. Our results show that EWG restricts synaptic growth by integrating multiple cellular signaling pathways into an extensive regulatory gene expression network.
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