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首页> 外文期刊>Development >Vreteno, a gonad-specific protein, is essential for germline development and primary piRNA biogenesis in Drosophila.
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Vreteno, a gonad-specific protein, is essential for germline development and primary piRNA biogenesis in Drosophila.

机译:Vreteno是一种性腺特异性蛋白,对于果蝇的种系发育和主要的piRNA生物发生至关重要。

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In Drosophila, Piwi proteins associate with Piwi-interacting RNAs (piRNAs) and protect the germline genome by silencing mobile genetic elements. This defense system acts in germline and gonadal somatic tissue to preserve germline development. Genetic control for these silencing pathways varies greatly between tissues of the gonad. Here, we identified Vreteno (Vret), a novel gonad-specific protein essential for germline development. Vret is required for piRNA-based transposon regulation in both germline and somatic gonadal tissues. We show that Vret, which contains Tudor domains, associates physically with Piwi and Aubergine (Aub), stabilizing these proteins via a gonad-specific mechanism that is absent in other fly tissues. In the absence of vret, Piwi-bound piRNAs are lost without changes in piRNA precursor transcript production, supporting a role for Vret in primary piRNA biogenesis. In the germline, piRNAs can engage in an Aub- and Argonaute 3 (AGO3)-dependent amplification in the absence of Vret, suggesting that Vret function can distinguish between primary piRNAs loaded into Piwi-Aub complexes and piRNAs engaged in the amplification cycle. We propose that Vret plays an essential role in transposon regulation at an early stage of primary piRNA processing.
机译:在果蝇中,Piwi蛋白与Piwi相互作用RNA(piRNA)结合,并通过沉默可移动的遗传元件来保护种系基因组。该防御系统作用于种系和性腺体细胞组织,以保持种系发育。这些沉默途径的遗传控制在性腺的各组织之间差异很大。在这里,我们确定了Vreteno(Vret),这是种系发育必不可少的新型性腺特异性蛋白。 Vret是种系和体细胞性腺组织中基于piRNA的转座子调控所必需的。我们显示Vret,其中包含Tudor域,与Piwi和茄子(Aub)物理关联,通过其他蝇组织中不存在的性腺特异性机制稳定这些蛋白质。在没有vret的情况下,Piwi结合的piRNA会丢失而不会改变piRNA前体转录物的产生,从而支持Vret在主要piRNA生物发生中的作用。在种系中,在没有Vret的情况下,piRNA可以参与Aub-和Argonaute 3(AGO3)依赖性扩增,这表明Vret的功能可以区分加载到Piwi-Aub复合物中的主要piRNA和参与扩增循环的piRNA。我们建议在初级piRNA加工的早期阶段,Vret在转座子调控中起重要作用。

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