摘要
Eukaryotic gene expression is controlled by different levels of biological events, such as transcription factors regulating the timing and strength of transcripts production, alteration of transcription rate by RNA processing, and mRNA stability during RNA processing and translation. RNAs, especially mRNAs, are relatively vulnerable molecules in living cells for ribonucleases （RNases）. The maintenance of quality and quantity of transcripts is a key issue for many biological processes. Extensive studies draw the conclusion that the stability of RNAs is dedicated-regulated, occurring co- and post-transcriptionally, and translation-coupled as well, either in the nucleus or cytoplasm. Recently, RNA stability in the nucleus has aroused much research interest, especially the stability of newly-made transcripts. In this article, we summarize recent progresses on mRNA stability in the nucleus, especially focusing on quality control of newly-made RNA by RNA polymerase Ⅱ in eukaryotes.
真核生物的基因表达由多种不同层次上的生物学事件所调控,如转录因子调节基因转录的发生时间和转录强度,RNA加工转录速度,RNA加工过程和翻译过程中对mRNA稳定性的影响。mRNA分子,相对其它生物分子而言,易受核酸酶的攻击而更不稳定。RNA的数量和质量上的维系在多种生物过程中是一个关键的影响因素。大量研究表明RNA的稳定性是在细胞核和细胞质中进行精细调控的过程,在转录中和转录后的加工修饰以及翻译的过程中均会发生。新生RNA在细胞核内稳定性的研究是近年来的研究热点。在本文中,我们总结了细胞核内的mRNA稳定性的最新研究进展,表明细胞核内mRNA的稳定性以及其相应的RNA质量控制机理广泛存在,并且和RNA生成、修饰加工以及成熟的每个步骤均有关联。
基金
Project supported by the Talented Scientist Program from South China Agricultural University (No.4600-K14013)
the National Natural Science Foundation of China (No.81301901)
