tRNA-derived small RNAs target transposable element transcripts.

tRNA-derived small RNAs target transposable element transcripts.
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DOI:
10.1093/nar/gkx103
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发表时间:
2017-05-19
影响因子:
14.9
通讯作者:
Slotkin RK
Slotkin RK
中科院分区:
生物学2区
文献类型:
--
作者:
Martinez G;Choudury SG;Slotkin RK

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tRNA衍生的RNA片段(tRFs)是18-26个核苷酸的小RNA,其不是随机降解产物,而是从成熟的tRNA转录物中特异性切割的。tRF在应激或病毒感染的细胞中大量存在,其功能和潜在靶点尚不清楚。我们发现,在未受压力的野生型雄配子含有开花植物的花粉,和类似的生殖结构在非开花植物物种,tRFs积累到高水平。在参考植物拟南芥中,tRFs被Dicer-like 1加工并整合到Argonaute 1(AGO 1)中,类似于microRNA。我们利用许多植物小RNA直接切割其靶转录物的事实来证明tRF-AGO 1复合物的作用是特异性靶向和切割由转录活性TE产生的内源性转座因子(TE)mRNA。本文提供的数据表明,tRF是真正的调节microRNA样小RNA,通过靶向TE转录物参与基因组稳定性的调节。
tRNA-derived RNA fragments (tRFs) are 18–26 nucleotide small RNAs that are not random degradation products, but are rather specifically cleaved from mature tRNA transcripts. Abundant in stressed or viral-infected cells, the function and potential targets of tRFs are not known. We identified that in the unstressed wild-type male gamete containing pollen of flowering plants, and analogous reproductive structure in non-flowering plant species, tRFs accumulate to high levels. In the reference plant Arabidopsis thaliana, tRFs are processed by Dicer-like 1 and incorporated into Argonaute1 (AGO1), akin to a microRNA. We utilized the fact that many plant small RNAs direct cleavage of their target transcripts to demonstrate that the tRF–AGO1 complex acts to specifically target and cleave endogenous transposable element (TE) mRNAs produced from transcriptionally active TEs. The data presented here demonstrate that tRFs are bona-fide regulatory microRNA-like small RNAs involved in the regulation of genome stability through the targeting of TE transcripts.
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