Terminal modification, sequence, length, and PIWI-protein identity determine piRNA stability.
Terminal modification, sequence, length, and PIWI-protein identity determine piRNA stability.
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末端修饰、序列、长度和PIWI蛋白同一性决定皮尔纳的稳定性。
DOI:
10.1016/j.molcel.2021.09.012
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发表时间:
2021-12-02
期刊:
影响因子:
16
通讯作者:
Zamore PD
中科院分区:
文献类型:
--
作者:
Gainetdinov I;Colpan C;Cecchini K;Arif A;Jouravleva K;Albosta P;Vega-Badillo J;Lee Y;Özata DM;Zamore PD
In animals, piRNAs silence transposons, fight viral infections, and regulate gene expression. piRNA biogenesis concludes with 3′ terminal trimming and 2′-O-methylation. Both trimming and methylation influence piRNA stability. Our biochemical data show that multiple mechanisms destabilize unmethylated mouse piRNAs, depending on whether the piRNA 5′ or 3′ sequence is complementary to a trigger RNA. Unlike target-directed degradation of microRNAs, complementarity-dependent destabilization of piRNAs in mice and flies is blocked by 3′ terminal 2′-O-methylation and does not require base pairing to both the piRNA seed and 3′ sequence. In flies, 2′-O-methylation also protects siRNAs from complementarity-dependent destruction. By contrast, pre-piRNA trimming protects mouse piRNAs from a degradation pathway unaffected by trigger complementarity. In testis lysate and in vivo, internal or 3′-terminal uridine- or guanine-rich tracts accelerate pre-piRNA decay. Loss of both trimming and 2′-O-methylation causes the mouse piRNA pathway to collapse, demonstrating that these modifications collaborate to stabilize piRNAs. piRNAs are an animal-specific class of small RNAs that repress transposons and regulate genes. piRNA biogenesis concludes with 3′-terminal trimming and 2′-O-methylation. Gainetdinov et al. show that trimming and 2′-O-methylation protect piRNAs from multiple degradation mechanisms triggered by extensively complementary RNAs or sequence motifs in the piRNA.
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