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
中科院分区:
文献类型:
--
作者:
Fang W;Wang X;Bracht JR;Nowacki M;Landweber LF
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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