Piwi-interacting RNAs protect DNA against loss during Oxytricha genome rearrangement.

Piwi-interacting RNAs protect DNA against loss during Oxytricha genome rearrangement.
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DOI:
10.1016/j.cell.2012.10.045
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发表时间:
2012-12-07
期刊:
影响因子:
64.5
通讯作者:
Landweber LF
Landweber LF
中科院分区:
生物学1区
文献类型:
--
作者:
Fang W;Wang X;Bracht JR;Nowacki M;Landweber LF

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纤毛原生动物的基因组二元性提供了一个独特的系统来展示它们的表观基因组作为遗传模式。在Oxytricha中,体细胞基因组负责营养生长,而生殖系则将DNA贡献给下一有性代。体细胞核发育去除了所有转座子和其他所谓的“垃圾DNA”,它们构成了大约95%的生殖系。我们证明,来自母核的Piwi相互作用小RNA(PiRNAs)可以指定在这一过程中保留的基因组区域。Oxytricha piRNAs主要定位于体细胞基因组,约占所保留种系的5%。此外,注射与正常缺失区域相对应的合成piRNAs会导致它们在后代中保留。我们的发现突出了小RNA(SRNAs)作为基因组编程表观遗传信息的强大跨代载体。
Genome duality in ciliated protozoa offers a unique system to showcase their epigenome as a model of inheritance. In Oxytricha, the somatic genome is responsible for vegetative growth, while the germline contributes DNA to the next sexual generation. Somatic nuclear development removes all transposons and other so-called “junk DNA”, which comprise ~95% of the germline. We demonstrate that Piwi-interacting small RNAs (piRNAs) from the maternal nucleus can specify genomic regions for retention in this process. Oxytricha piRNAs map primarily to the somatic genome, representing the ~5% of the germline that is retained. Furthermore, injection of synthetic piRNAs corresponding to normally-deleted regions leads to their retention in later generations. Our findings highlight small RNAs (sRNAs) as powerful transgenerational carriers of epigenetic information for genome programming.
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