Posttranscriptional regulation of gene networks by GU-rich elements and CELF proteins.

Posttranscriptional regulation of gene networks by GU-rich elements and CELF proteins.
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DOI:
10.4161/rna.7056
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发表时间:
2008-10
期刊:
影响因子:
4.1
通讯作者:
Bohjanen, Paul R.
Bohjanen, Paul R.
中科院分区:
生物学3区
文献类型:
--
作者:
Vlasova, Irina A.;Bohjanen, Paul R.

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在前体mRNA和mRNA转录物中发现的富含GU的元件通过调节mRNA稳定性、翻译和前体mRNA加工在基因表达的控制中发挥不同的作用。富含谷氨酸的调控元件在整个进化过程中高度保守,并在从蠕虫到哺乳动物的不同物种的发育中发挥重要作用。富含GU的元件的保守性使其被鉴定为在显示出快速mRNA衰变的人类转录物的3′ UTR中富集的序列。该元件至少部分地作为RNA结合蛋白的CELF家族成员的分子靶标起作用,其将细胞转录后基因调控机制的其他组分募集到转录物中。根据上下文,CELF蛋白与富含GU的序列的结合指导多种转录后调节事件,包括去腺苷化、mRNA衰变、翻译或前mRNA加工。因此,富含GU的元件和CELF蛋白在基因表达调控中具有多种功能,并定义了一个重要的进化保守的转录后调控网络。
GU-rich elements found in pre-mRNA and mRNA transcripts play diverse roles in the control of gene expression by regulating mRNA stability, translation and pre-mRNA processing. Regulatory GU-rich elements are highly conserved throughout evolution, and play major roles in development in diverse species from worms to mammals. The conservation of the GU-rich element allowed it to be identified as a sequence that was enriched in the 3′ UTR of human transcripts that exhibited rapid mRNA decay. This element functions, at least in part, as a molecular target for members of the CELF family of RNA-binding proteins, which recruit other components of the cellular posttranscriptional gene regulatory machinery to the transcript. Depending on the context, binding to GU-rich sequences by CELF proteins direct a variety of posttranscriptional regulatory events, including deadenylation, mRNA decay, translation or pre-mRNA processing. Thus, GU-rich elements and CELF proteins serve multiple functions in gene expression regulation and define an important evolutionarily conserved posttranscriptional regulatory network.
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