Asterix/Gtsf1 links tRNAs and piRNA silencing of retrotransposons.
Asterix/Gtsf1 links tRNAs and piRNA silencing of retrotransposons.
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Asterix/Gtsf1 连接反转录转座子的 tRNA 和 piRNA 沉默。
DOI:
10.1016/j.celrep.2021.108914
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发表时间:
2021-03-30
期刊:
影响因子:
8.8
通讯作者:
Joshua-Tor L
中科院分区:
文献类型:
--
作者:
Ipsaro JJ;O'Brien PA;Bhattacharya S;Palmer AG 3rd;Joshua-Tor L
The piRNA pathway safeguards genomic integrity by silencing transposable elements (transposons) in the germline. While Piwi is the central piRNA factor, others including Asterix/Gtsf1 have also been demonstrated to be critical for effective silencing. Here, using eCLIP with a custom informatic pipeline, we show that Asterix/Gtsf1 specifically binds tRNAs in cellular contexts. We determined the structure of mouse Gtsf1 by NMR spectroscopy and identified the RNA binding interface on the protein’s first zinc finger, which was corroborated by biochemical analysis as well as cryo-EM structures of Gtsf1 in complex with co-purifying tRNA. Given the known dependence of LTR retrotransposons on tRNAs primers, we suspected then demonstrated that LTR retrotransposons are in fact preferentially de-repressed in Asterix mutants. Together, these findings link Asterix/Gtsf1, tRNAs, and LTR retrotransposon silencing, and suggest that Asterix exploits tRNA dependence to identify transposon transcripts and promote piRNA silencing.
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