Base-Resolution Mapping Reveals Distinct m(1)A Methylome in Nuclear- and Mitochondrial-Encoded Transcripts.

Base-Resolution Mapping Reveals Distinct m(1)A Methylome in Nuclear- and Mitochondrial-Encoded Transcripts.
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碱基分辨率作图揭示核和线粒体编码转录本中不同的 m1A 甲基化组

DOI:
10.1016/j.molcel.2017.10.019
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发表时间:
2017-12-07
期刊:
影响因子:
16
通讯作者:
Yi C
Yi C
中科院分区:
生物学1区
文献类型:
--
作者:
Li X;Xiong X;Zhang M;Wang K;Chen Y;Zhou J;Mao Y;Lv J;Yi D;Chen XW;Wang C;Qian SB;Yi C

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基因表达可以通过动态和可逆的 RNA 修饰进行转录后调节。 N1-甲基腺苷 (m1A) 是最近发现的一种 mRNA 修饰;然而,人们对它的精确位置和生物起源知之甚少。在这里,我们开发了一种基于逆转录过程中 m1A 诱导的错误掺入的碱基分辨率 m1A 分析方法,并报告了人类转录组中 m1A 甲基化组的不同类别。 5'-UTR 中的 m1A,尤其是 mRNA 帽中的 m1A,与翻译效率的提高相关。 m1A 的一个不同的小子集表现出 GUUCRA tRNA 样基序,均匀分布在转录组中,并且依赖于甲基转移酶 TRMT6/61A。此外,我们发现 m1A 在线粒体编码的转录本中普遍存在。通过 TRMT61B(一种线粒体定位 m1A 甲基转移酶)操纵 m1A 水平,表明线粒体 mRNA 中的 m1A 会干扰翻译。总的来说,我们的方法揭示了 m1A 甲基化组的不同类别,并为 m1A 介导的表观转录组调控的功能研究提供了资源。李等人。开发了一种名为“m1A-MAP”的单核苷酸分辨率技术,用于分析人类转录组中的 m1A,并揭示了核和线粒体编码转录本中 m1A 甲基化组的不同类别。
Gene expression can be post-transcriptionally regulated via dynamic and reversible RNA modifications. N1-methyladenosine (m1A) is a recently identified mRNA modification; however, little is known about its precise location and biogenesis. Here, we develop a base-resolution m1A profiling method, based on m1A-induced misincorporation during reverse transcription, and report distinct classes of m1A methylome in the human transcriptome. m1A in 5′-UTR, particularly those at the mRNA cap, associate with increased translation efficiency. A different, small subset of m1A exhibit a GUUCRA tRNA-like motif, are evenly distributed in the transcriptome and are dependent on the methyltransferase TRMT6/61A. Additionally, we show that m1A is prevalent in the mitochondrial-encoded transcripts. Manipulation of m1A level via TRMT61B, a mitochondria-localizing m1A methyltransferase, demonstrates that m1A in mitochondrial mRNA interferes with translation. Collectively, our approaches reveal distinct classes of m1A methylome and provide a resource for functional studies of m1A-mediated epitranscriptomic regulation. Li et al. developed a single-nucleotide-resolution technology, named “m1A-MAP”, to profile m1A in the human transcriptome, and revealed distinct classes of m1A methylome in nuclear- and mitochondrial-encoded transcripts.
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