Musashi mediates translational repression of the Drosophila hypoxia inducible factor.

Musashi mediates translational repression of the Drosophila hypoxia inducible factor.
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DOI:
10.1093/nar/gkw372
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发表时间:
2016-09-19
影响因子:
14.9
通讯作者:
Wappner P
Wappner P
中科院分区:
生物学2区
文献类型:
--
作者:
Bertolin AP;Katz MJ;Yano M;Pozzi B;Acevedo JM;Blanco-Obregón D;Gándara L;Sorianello E;Kanda H;Okano H;Srebrow A;Wappner P

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低氧适应依赖于一种称为低氧诱导因子(HIF)的保守的α/β异二聚体转录因子,其α亚基通过不同的并发机制受氧调节。在这项研究中,我们已经确定了RNA结合蛋白dMusashi,作为一个负调节的苍蝇HIF同源司马。遗传相互作用分析表明dMusashi参与了HIF途径,在果蝇细胞培养中进行的分子研究表明,dMusashi识别HIFα转录本3′ UTR中的Musashi结合元件,从而介导其在常氧下的翻译抑制。在缺氧条件下,dMusashi下调,解除HIFα抑制并有助于触发HIF依赖性基因表达。在小鼠脑中进行的分析显示,小鼠Msi 1蛋白与HIF-1α转录物物理相互作用,表明Msi对HIF的调节可能在哺乳动物系统中是保守的。因此,Musashi是一种新的HIF调节剂,在氧气可用时特异性地抑制对缺氧的反应。
Adaptation to hypoxia depends on a conserved α/β heterodimeric transcription factor called Hypoxia Inducible Factor (HIF), whose α-subunit is regulated by oxygen through different concurrent mechanisms. In this study, we have identified the RNA binding protein dMusashi, as a negative regulator of the fly HIF homologue Sima. Genetic interaction assays suggested that dMusashi participates of the HIF pathway, and molecular studies carried out in Drosophila cell cultures showed that dMusashi recognizes a Musashi Binding Element in the 3′ UTR of the HIFα transcript, thereby mediating its translational repression in normoxia. In hypoxic conditions dMusashi is downregulated, lifting HIFα repression and contributing to trigger HIF-dependent gene expression. Analysis performed in mouse brains revealed that murine Msi1 protein physically interacts with HIF-1α transcript, suggesting that the regulation of HIF by Msi might be conserved in mammalian systems. Thus, Musashi is a novel regulator of HIF that inhibits responses to hypoxia specifically when oxygen is available.
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