The RNA polymerase II subunit RPB-9 recruits the integrator complex to terminate Caenorhabditis elegans piRNA transcription.

The RNA polymerase II subunit RPB-9 recruits the integrator complex to terminate Caenorhabditis elegans piRNA transcription.
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RNA聚合酶II亚基RPB-9募集整合子复合物以终止秀丽隐杆线虫皮尔纳转录。

DOI:
10.15252/embj.2020105565
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发表时间:
2021-03-01
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Miska EA
Miska EA
中科院分区:
其他
文献类型:
--
作者:
Berkyurek AC;Furlan G;Lampersberger L;Beltran T;Weick EM;Nischwitz E;Cunha Navarro I;Braukmann F;Akay A;Price J;Butter F;Sarkies P;Miska EA

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Piwi相互作用RNAs(PiRNAs)是基因组编码的小RNA,在许多动物中调节生殖细胞的发育和维持生殖系的完整性。成熟的piRNA利用Piwi ArgAerte蛋白来沉默互补转录产物,包括转座元件和内源基因。PiRNA的生物发生机制多种多样,目前仍知之甚少。在这里,我们确定了线虫线虫中piRNA介导的沉默所必需的RNA聚合酶II(RNA POL II)核心亚单位RPB-9。我们发现RPB-9在两个DNA转座子家族和生殖系中的一个体细胞基因子集启动了可遗传的piRNA介导的基因沉默。我们通过在piRNA基因上招募整合子复合体,从而促进转录终止,提供了遗传和生化证据,表明RPB-9是piRNA生物发生所必需的。我们的结论是,作为其快速进化的一部分,piRNA途径已经采用了一种古老的高保真转录机制。PiRNA的生物发生需要RBP-9介导的复杂piRNA基因的转录终止。
PIWI‐interacting RNAs (piRNAs) are genome‐encoded small RNAs that regulate germ cell development and maintain germline integrity in many animals. Mature piRNAs engage Piwi Argonaute proteins to silence complementary transcripts, including transposable elements and endogenous genes. piRNA biogenesis mechanisms are diverse and remain poorly understood. Here, we identify the RNA polymerase II (RNA Pol II) core subunit RPB‐9 as required for piRNA‐mediated silencing in the nematode Caenorhabditis elegans. We show that rpb‐9 initiates heritable piRNA‐mediated gene silencing at two DNA transposon families and at a subset of somatic genes in the germline. We provide genetic and biochemical evidence that RPB‐9 is required for piRNA biogenesis by recruiting the Integrator complex at piRNA genes, hence promoting transcriptional termination. We conclude that, as a part of its rapid evolution, the piRNA pathway has co‐opted an ancient machinery for high‐fidelity transcription. piRNA biogenesis requires RBP‐9 mediated transcriptional termination at complex piRNA genes.
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