Small RNAs establish gene expression thresholds.

Small RNAs establish gene expression thresholds.
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DOI:
10.1016/j.mib.2008.09.016
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发表时间:
2008-12
影响因子:
5.4
通讯作者:
Hwa, Terence
Hwa, Terence
中科院分区:
生物学2区
文献类型:
--
作者:
Levine, Erel;Hwa, Terence

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近年来,小rna在调节细菌基因表达中的核心作用已被阐明。通常,小rna通过与靶mRNA的特异性碱基修复作用,导致翻译起始和mRNA稳定性的调节。定量研究表明,小RNA调控具有独特的特征,使其能够在转录水平上补充调控。特别是,小rna被证明为其靶标的表达建立了一个阈值,为随机波动和瞬态信号提供了安全机制。阈值水平由小RNA的转录速率设定,因此可以动态调节以反映不断变化的环境条件。
The central role of small RNAs in regulating bacterial gene expression has been elucidated in the last years. Typically, small RNAs act via specific basepairing with target mRNAs, leading to modulation of translation initiation and mRNA stability. Quantitative studies suggest that small RNA regulation is characterized by unique features, which allow it to complement regulation at the transcriptional level. In particular, small RNAs are shown to establish a threshold for the expression of their target, providing safety mechanism against random fluctuations and transient signals. The threshold level is set by the transcription rate of the small RNA, and can thus be modulated dynamically to reflect changing environmental conditions.
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