MicroRNAs can generate thresholds in target gene expression.
MicroRNAs can generate thresholds in target gene expression.
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DOI:
10.1038/ng.905
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发表时间:
2011-08-21
期刊:
影响因子:
30.8
通讯作者:
van Oudenaarden, Alexander
中科院分区:
文献类型:
--
作者:
Mukherji, Shankar;Ebert, Margaret S.;Zheng, Grace X. Y.;Tsang, John S.;Sharp, Phillip A.;van Oudenaarden, Alexander
MicroRNAs (miRNAs) are short, highly conserved non-coding RNA molecules that repress gene expression in a sequence-dependent manner. We performed single-cell measurements using quantitative fluorescence microscopy and flow cytometry to monitor a target gene’s protein expression in the presence and absence of regulation by miRNA. We find that while the average level of repression is modest, in agreement with previous population-based measurements, the repression among individual cells varies dramatically. In particular, we show that regulation by miRNAs establishes a threshold level of target messenger RNA (mRNA) below which protein production is highly repressed. Near this threshold, protein expression responds sensitively to target mRNA input, consistent with a mathematical model of molecular titration. These results demonstrate that miRNAs can act both as a switch and as a fine-tuner of gene expression.
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