Sensing miRNA: Signal Amplification by Cognate RISC for Intracellular Detection of miRNA in Live Cells.

Sensing miRNA: Signal Amplification by Cognate RISC for Intracellular Detection of miRNA in Live Cells.
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传感 miRNA:通过 Cognate RISC 进行信号放大,用于活细胞中 miRNA 的胞内检测。

DOI:
10.1007/978-1-4939-3148-4_10
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发表时间:
2016
期刊:
Methods in molecular biology (Clifton, N.J.)
影响因子:
--
通讯作者:
Medarova,Zdravka
Medarova,Zdravka
中科院分区:
--
文献类型:
--
作者:
Kavishwar,Amol;Medarova,Zdravka

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在活细胞中检测miRNA表达的能力将使这些细胞可以进行进一步的操作或培养。在这里,我们描述了一种miRNA传感器寡核苷酸的设计,其序列模拟目标mRNA。该传感器在寡聚物的一端有荧光标签,在另一端有猝灭剂。在细胞内,传感器被其同源miRNA-RISC识别并被切割,使荧光团从其猝灭剂中解脱出来。这会导致荧光“开启”。由于RISC复合体的切割是一个酶过程,所描述的方法具有非常高的灵敏度(NM)。传感器的非特异性裂解速度非常慢,允许在很长一段时间内收集有意义的信号。
The ability to detect miRNA expression in live cells would leave these cells available for further manipulation or culture. Here, we describe the design of a miRNA sensor oligonucleotide whose sequence mimics the target mRNA. The sensor has a fluorescent label on one end of the oligo and a quencher on the other. When inside the cell, the sensor is recognized by its cognate miRNA-RISC and gets cleaved, setting the fluorophore free from its quencher. This results in fluorescence “turn on.” Since cleavage by the RISC complex is an enzymatic process, the described approach has a very high level of sensitivity (nM). The rate of nonspecific cleavage of the sensor is very slow permitting the collection of meaningful signal over a long period of time.
DOI: --
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影响因子: --
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