The Drosophila HP1 homolog Rhino is required for transposon silencing and piRNA production by dual-strand clusters.

The Drosophila HP1 homolog Rhino is required for transposon silencing and piRNA production by dual-strand clusters.
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果蝇HP1同源性犀牛是通过双链簇产生的转座子沉默和PIRNA所必需的。

DOI:
10.1016/j.cell.2009.07.014
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发表时间:
2009-09-18
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:
Klattenhoff C;Xi H;Li C;Lee S;Xu J;Khurana JS;Zhang F;Schultz N;Koppetsch BS;Nowosielska A;Seitz H;Zamore PD;Weng Z;Theurkauf WE

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在生殖系发育过程中,piRNAs沉默转座子并维持基因组的完整性。在果蝇中,富含转座子的异色簇编码两条基因组链(双链簇)或主要一条基因组链(单链簇)上的piRNA。来自这些簇的初级piRNAs被认为驱动由定位于核周核的蛋白质催化的乒乓球扩增循环。我们发现HP1同源物Rhino是piRNAs的核组织、转座子沉默和乒乓球扩增所必需的。RHI突变几乎消除了双链簇中的piRNAs,并阻止了主要42AB双链簇的两条链中推测的前体RNA的产生,但不阻止单链簇中转录本或piRNAs的产生。此外,犀牛蛋白与42AB双链簇结合,但不与单链簇2或弗拉门戈结合。因此,犀牛似乎促进了双链簇的转录,导致了驱动乒乓球扩增周期的piRNA的产生。
piRNAs silence transposons and maintain genome integrity during germ-line development. In Drosophila, transposon-rich heterochromatic clusters encode piRNAs either on both genomic strands (dual-strand clusters) or predominantly one genomic strand (uni-strand clusters). Primary piRNAs derived from these clusters are proposed to drive a ping-pong amplification cycle catalyzed by proteins that localize to the perinuclear nuage. We show that the HP1 homologue Rhino is required for nuage organization, transposon silencing, and ping-pong amplification of piRNAs. rhi mutations virtually eliminate piRNAs from the dual-strand clusters and block production of putative precursor RNAs from both strands of the major 42AB dual-strand cluster, but do not block production of transcripts or piRNAs from the uni-strand clusters. Furthermore, Rhino protein associates with the 42AB dual-strand cluster, but does not bind to uni-strand cluster 2 or flamenco. Rhino thus appears to promote transcription of dual-strand clusters, leading to production of piRNAs that drive the ping-pong amplification cycle.
DOI: 10.1073/pnas.0805943105
发表时间: 2008-09-30
影响因子: 11.1
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