Negative regulation of EGFR/MAPK pathway by Pumilio in Drosophila melanogaster.

Negative regulation of EGFR/MAPK pathway by Pumilio in Drosophila melanogaster.
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DOI:
10.1371/journal.pone.0034016
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Kim C
Kim C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kim SY;Kim JY;Malik S;Son W;Kwon KS;Kim C

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在果蝇中,翼静脉细胞和感觉器官前体 (SOP) 细胞的特化(随后产生刚毛)需要 EGFR 信号传导。在这里,我们发现 Pumilio (Pum) 是一种 RNA 结合翻译抑制因子,可负向调节翼静脉和刚毛发育中的 EGFR 信号传导。我们观察到,Pum 功能的丧失会产生额外的翅脉和额外的刚毛。相反,Pum 的过度表达消除了翅脉和刚毛。 Pum 杂合子本身不产生表型,但由于 EGFR 信号传导的增强而大大增强了表型。相反,Pum 的过度表达抑制了异位 EGFR 信号传导的影响。 EGFR 信号通路的成分由 mRNA 编码,这些 mRNA 的 3’UTR 中具有 Nanos 响应元件 (NRE) 样序列;已知 NRE 可以结合 Pum,从而对其他 mRNA 进行调节。我们发现这些 NRE 样序列结合 Pum 并抑制异源细胞中的荧光素酶报告基因。综上所述,我们的证据表明,Pum 通过直接靶向果蝇中该通路的成分,充当 EGFR 信号传导的负调节因子。
In Drosophila melanogaster, specification of wing vein cells and sensory organ precursor (SOP) cells, which later give rise to a bristle, requires EGFR signaling. Here, we show that Pumilio (Pum), an RNA-binding translational repressor, negatively regulates EGFR signaling in wing vein and bristle development. We observed that loss of Pum function yielded extra wing veins and additional bristles. Conversely, overexpression of Pum eliminated wing veins and bristles. Heterozygotes for Pum produced no phenotype on their own, but greatly enhanced phenotypes caused by the enhancement of EGFR signaling. Conversely, over-expression of Pum suppressed the effects of ectopic EGFR signaling. Components of the EGFR signaling pathway are encoded by mRNAs that have Nanos Response Element (NRE)–like sequences in their 3’UTRs; NREs are known to bind Pum to confer regulation in other mRNAs. We show that these NRE-like sequences bind Pum and confer repression on a luciferase reporter in heterologous cells. Taken together, our evidence suggests that Pum functions as a negative regulator of EGFR signaling by directly targeting components of the pathway in Drosophila.
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