A transcriptome-wide RNAi screen in the Drosophila ovary reveals factors of the germline piRNA pathway.

A transcriptome-wide RNAi screen in the Drosophila ovary reveals factors of the germline piRNA pathway.
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DOI:
10.1016/j.molcel.2013.04.007
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发表时间:
2013-06-06
期刊:
影响因子:
16
通讯作者:
Hannon, Gregory J.
Hannon, Gregory J.
中科院分区:
生物学1区
文献类型:
--
作者:
Czech, Benjamin;Preall, Jonathan B.;McGinn, Jon;Hannon, Gregory J.

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果蝇皮尔纳途径提供了一种基于RNA的免疫系统,该系统保护种系基因组免受自私遗传因子的侵害。皮尔纳系统存在两个相互关联的分支:支持卵子发生的体细胞仅使用Piwi,而生殖细胞使用以三种性腺特异性Argonaute蛋白Piwi,Aubergine和Argonaute 3为中心的更精细的途径。虽然已经确定了每个分支的几个关键因素,但我们目前的知识不足以解释皮尔纳机制的复杂工作。在这里,我们报告了一个跨越卵巢转录组的反向遗传筛选,试图揭示女性生殖系中piRNA介导的转座子沉默所需的全部基因。我们的筛选揭示了piRNA介导的转座子沉默的新的关键因子,包括新的皮尔纳生物发生因子CG2183(GASZ)和Deadlock。最后,我们的数据揭示了一组先前未预料到的因素,优先需要抑制不同的转座子类型。
The Drosophila piRNA pathway provides an RNA-based immune system that defends the germline genome against selfish genetic elements. Two inter-related branches of the piRNA system exist: somatic cells that support oogenesis only employ Piwi, whereas germ cells utilize a more elaborated pathway centered on the three gonad-specific Argonaute proteins Piwi, Aubergine, and Argonaute3. While several key factors of each branch have been identified, our current knowledge is insufficient to explain the complex workings of the piRNA machinery. Here, we report a reverse genetic screen spanning the ovarian transcriptome in an attempt to uncover the full repertoire of genes required for piRNA-mediated transposon silencing in the female germline. Our screen reveals new key factors of piRNA-mediated transposon silencing, including the novel piRNA biogenesis factors, CG2183 (GASZ) and Deadlock. Last, our data uncovers a previously unanticipated set of factors preferentially required for repression of different transposons types.
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