The HP1 homolog rhino anchors a nuclear complex that suppresses piRNA precursor splicing.

The HP1 homolog rhino anchors a nuclear complex that suppresses piRNA precursor splicing.
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DOI:
10.1016/j.cell.2014.04.030
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发表时间:
2014-06-05
期刊:
影响因子:
64.5
通讯作者:
Theurkauf WE
Theurkauf WE
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang Z;Wang J;Schultz N;Zhang F;Parhad SS;Tu S;Vreven T;Zamore PD;Weng Z;Theurkauf WE

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piRNA 引导适应性基因组防御系统,在种系发育过程中沉默转座子。果蝇 HP1 同源犀牛是种系 piRNA 生产所必需的。我们发现 Rhino 特异性结合产生 piRNA 前体的异染色质簇,并且这种结合与 piRNA 的产生直接相关。 Rhino 与 Rai1/DXO 相关蛋白 Cuff 和 DEAD box 蛋白 UAP56 共定位于种系核灶,这也是种系 piRNA 产生所必需的。 RNA测序表明大多数簇转录本没有剪接,并且rhino、cuff和uap56突变使剪接簇转录本的表达增加了100倍以上。 LacI∷Rhino 融合蛋白结合抑制报告基因转基因的剪接,并足以触发有义和反义报告基因的反式组合产生 piRNA。因此,我们提出 Rhino 锚定了一个抑制簇转录物剪接的核复合物,并推测停滞的剪接将 piRNA 前体与 mRNA 区分开来。
piRNAs guide an adaptive genome defense system that silences transposons during germline development. The Drosophila HP1 homolog Rhino is required for germline piRNA production. We show that Rhino binds specifically to the heterochromatic clusters that produce piRNA precursors, and that binding directly correlates with piRNA production. Rhino co-localizes to germline nuclear foci with Rai1/DXO related protein Cuff and the DEAD box protein UAP56, which are also required for germline piRNA production. RNA sequencing indicates that most cluster transcripts are not spliced, and that rhino, cuff and uap56 mutations increase expression of spliced cluster transcripts over 100 fold. LacI∷Rhino fusion protein binding suppresses splicing of a reporter transgene, and is sufficient to trigger piRNA production from a trans combination of sense and antisense reporters. We therefore propose that Rhino anchors a nuclear complex that suppresses cluster transcript splicing, and speculate that stalled splicing differentiates piRNA precursors from mRNAs.
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