高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (3): 20220173.doi: 10.7503/cjcu20220173

• 研究论文 • 上一篇    下一篇

外源N6-甲基腺嘌呤掺入对细胞mRNA表达的影响

张青一, 曹婕, 舒潇, 刘建钊   

  1. 浙江大学高分子科学与工程学系,生物医用大分子研究所,高分子合成与功能构造教育部重点实验室,杭州 310027
  • 收稿日期:2022-03-21 出版日期:2023-03-10 发布日期:2023-03-14
  • 基金资助:
    国家自然科学基金(22022702);国家重点研发计划项目(2017YFA0506800);中央高校基础研究基金和浙江大学百人计划项目资助

Effects of Exogenous N6-methyladenosine Incorporation on the Expression of Cellular mRNA Transcripts

ZHANG Qingyi, CAO Jie, SHU Xiao, LIU Jianzhao()   

  1. Key Laboratory of Macromolecular Synthesis and Functionalization,Ministry of Education,Institute of Biomedical Macromolecules,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China
  • Received:2022-03-21 Online:2023-03-10 Published:2023-03-14
  • Contact: LIU Jianzhao E-mail:liujz@zju.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22022702);the National Key Research and Development Program of China(2017YFA0506800);the Fundamental Research Funds for the Central Universities, China and the Hundred Talents Program in Zhejiang University, China

摘要:

N6-甲基腺嘌呤(m6A)是一种真核细胞中最广泛存在且可逆的内源mRNA修饰, 它在决定RNA命运中起着至关重要的作用. 本文发现外源m6A可以通过补救合成途径掺入到细胞mRNA, 并评估了外源m6A掺入mRNA后所产生的生物学效应. 首先, 发现用m6A核苷处理HeLa细胞会显著改变细胞的形态和活力; 然后, 合成了同位素标记的d3-m6A(N6-甲基-d3-腺苷), 并采用质谱法检测了不同处理时间下细胞mRNA中d3-m6A的掺入率; 随后, 使用RNA测序(RNA-seq)研究外源m6A掺入的生物学效应. 结果表明, 掺入外源m6A后的细胞有数千个基因产生差异表达, 并且这些差异表达的基因在核糖体生物发生、 mRNA代谢过程和细胞形态发生分化等途径中显著富集. 研究结果表明, 外源m6A可以通过代谢途径掺入细胞内源mRNA中, 并可以影响细胞基因表达.

关键词: m6A修饰, mRNA甲基化, d3-m6A同位素标记, mRNA代谢标记

Abstract:

N6-methyladenosine(m6A) is the most prevalent and reversible internal mRNA modification in eukaryotic cells, and plays an essential role in RNA fate determination. In this work, we studied the exogenous incorporation of m6A into cellular mRNA through salvage pathway and evaluated its resultant biological effects. First, we found that feeding of HeLa cells with m6A nucleoside significantly altered cell morphology and viability. We then synthesized isotope-labelled d3-m6A(N6-methyl-d3-adenosine) and examined the d3-m6A incorporation rate in cellular mRNA along with incubation time using mass spectrometry. Next, RNA sequencing(RNA-seq) was used to study the biological effects of exogenous m6A incorporation. Finally, thousands of genes were found to be differentially expressed, and were dramatically enriched in pathways such as ribosome biogenesis, mRNA metabolic process and cell morphogenesis differentiation. All these results suggested that exogenous m6A could be incorporated into mRNAs through a metabolic pathway to influence cellular gene expression.

Key words: m6A Modification, mRNA Methylation, d3-m6A Isotope labelling, mRNA Metabolic labelling

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