A G-quadruplex DNA-based, label-free and ultrasensitive strategy for microRNA detection.

A G-quadruplex DNA-based, label-free and ultrasensitive strategy for microRNA detection.
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基于 G-四链体 DNA、无标记且超灵敏的 microRNA 检测策略。

DOI:
10.1038/srep07400
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发表时间:
2014-12-10
期刊:
影响因子:
4.6
通讯作者:
Zhao J
Zhao J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yan L;Yan Y;Pei L;Wei W;Zhao J

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MicroRNAs (miRNAs)被认为是早期疾病诊断和癌症治疗的有效生物标志物。不需要逆转录和标记的快速和选择性检测mirna是非常需要的。在此,我们报告了一种简单且无标记的miRNA检测方法,该方法基于双工特异性核酸酶(DSN)辅助的简单靶miRNA回收过程。g -四重体DNA结构与n -甲基间卟啉IX (NMM)相互作用导致无标记信号输出。在优化的条件下,该方法可以在1 fM到100 nM的动态范围和1 pM到100 nM的线性范围内对miR-141进行简单、快速和序列特异性的检测。此外,我们的方法提供了一个极好的能力来区分miRNA家族成员只有一个不匹配的核苷酸。这种简单且无标签的策略在生物医学研究和早期临床诊断中具有巨大的应用潜力。
MicroRNAs (miRNAs) have been considered to be potent biomarkers for early disease diagnosis and for cancer therapy. The rapid and selective detection of miRNAs without reverse transcription and labelling is highly desired. Herein, we report a simple and label-free miRNA detection method that is based on the Duplex-Specific Nuclease (DSN)-Assisted simple target miRNA recycling procedure. The interaction of the G-quadruplex DNA structure with N-methyl mesoporphyrin IX (NMM) led to a label-free signal output. Under the optimised conditions, this method allowed for simple, rapid, and sequence-specific detection of miR-141 over a dynamic range from 1 fM to 100 nM with a linear range from 1 pM to 100 nM. Moreover, our method offered an excellent capacity to discriminate between miRNA family members with just one mismatched nucleotide. This simple and label-free strategy holds great potential in applications in biomedical research and in early clinical diagnostics.
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