Phased piRNAs tackle transposons

Phased piRNAs tackle transposons
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DOI:
10.1126/science.aab3004
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发表时间:
2015-05
期刊:
影响因子:
56.9
通讯作者:
H. Siomi;M. Siomi
H. Siomi;M. Siomi
中科院分区:
综合性期刊1区
文献类型:
--
作者:
H. Siomi;M. Siomi

文献摘要

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三级 piRNA 有助于沉默危险的 DNA 元素 [另请参阅 Mohn 等人的报告。和 Han 等人。]转座元件是真核基因组的主要居民。它们动员和插入基因组中任何位置的能力可能会导致通常对宿主有害的突变。这使他们成为压制的主要目标。称为 PIWI 相互作用 RNA (piRNA) 的小 RNA 是攻击转座子的一种手段。它们构成了最大的一类小RNA,但它们的产生机制尚不完全清楚。 Mohn 等人在本期第 812 和 817 页上。 (1) 和韩等人。 (2) 分别提出了一种改进的 piRNA 生物发生模型,该模型增加了 piRNA 序列的多样性,从而扩大了它们可以沉默的靶标范围。
Tertiary piRNAs help silence dangerous DNA elements [Also see Reports by Mohn et al. and Han et al.] Transposable elements are dominant inhabitants of the eukaryotic genome. Their ability to mobilize and insert anywhere in the genome can cause mutations that are generally detrimental to the host. This makes them key targets for silencing. Small RNAs called PIWI-interacting RNAs (piRNAs) are one means to attack transposons. They constitute the largest class of small RNAs, but the mechanisms by which they are generated are not completely clear. On pages 812 and 817 of this issue, Mohn et al. (1) and Han et al. (2), respectively, propose a revised model for piRNA biogenesis that increases the diversity of piRNA sequences and thereby expands the range of targets they can silence.