Extensive translation of circular RNAs driven by N(6)-methyladenosine.

Extensive translation of circular RNAs driven by N(6)-methyladenosine.
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N6-甲基腺苷驱动的环状 RNA 的广泛翻译。

DOI:
10.1038/cr.2017.31
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发表时间:
2017-05
期刊:
影响因子:
44.1
通讯作者:
Wang Z
Wang Z
中科院分区:
生物学1区
文献类型:
--
作者:
Yang Y;Fan X;Mao M;Song X;Wu P;Zhang Y;Jin Y;Yang Y;Chen LL;Wang Y;Wong CC;Xiao X;Wang Z

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广泛的前体mRNA反向剪接在人类转录组中产生大量环状RNA(circRNA)。然而,这些circRNA的生物学功能在很大程度上仍不清楚。在这里,我们报告N6-甲基腺苷(m6 A),RNA的最丰富的碱基修饰,促进在人类细胞中从circRNA的蛋白质翻译的有效启动。我们发现共有m6 A基序在circRNA中富集,并且单个m6 A位点足以驱动翻译起始。这种m6 A驱动的翻译需要起始因子eIF 4G 2和m6 A阅读器YTHDF 3,并被甲基转移酶L3/14增强,被去甲基酶FTO抑制,并在热休克后上调。通过多核糖体分析、计算预测和质谱的进一步分析揭示,m6 A驱动的circRNA翻译是广泛的,数百种内源性circRNA具有翻译潜力。我们的研究扩展了人类转录组的编码景观,并表明circRNA衍生蛋白在细胞对环境应激的反应中的作用。
Extensive pre-mRNA back-splicing generates numerous circular RNAs (circRNAs) in human transcriptome. However, the biological functions of these circRNAs remain largely unclear. Here we report that N6-methyladenosine (m6A), the most abundant base modification of RNA, promotes efficient initiation of protein translation from circRNAs in human cells. We discover that consensus m6A motifs are enriched in circRNAs and a single m6A site is sufficient to drive translation initiation. This m6A-driven translation requires initiation factor eIF4G2 and m6A reader YTHDF3, and is enhanced by methyltransferase METTL3/14, inhibited by demethylase FTO, and upregulated upon heat shock. Further analyses through polysome profiling, computational prediction and mass spectrometry reveal that m6A-driven translation of circRNAs is widespread, with hundreds of endogenous circRNAs having translation potential. Our study expands the coding landscape of human transcriptome, and suggests a role of circRNA-derived proteins in cellular responses to environmental stress.
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