核糖核酸
级联
小RNA
DNA
细胞内
多重位移放大
纳米技术
信号(编程语言)
化学
细胞生物学
生物物理学
计算生物学
材料科学
生物
计算机科学
聚合酶链反应
生物化学
基因
DNA提取
色谱法
程序设计语言
作者
Juan Song,Han-Zhang Mou,Xiaoqiong Li,Yu Liu,Xianhui Yang,Hong‐Yuan Chen,Jing‐Juan Xu
标识
DOI:10.1016/j.snb.2022.131644
摘要
In situ visual detection of microRNAs (miRNAs) is of great significance for early diagnosis of miRNA-related diseases. In this study, we designed a rolling circle replication-driven self-assembled nucleic acid nanosphere (NS) for imaging miRNAs in living cells, which was loaded with four functional oligonucleotides (THp, H1, H2, H3) through hybridization. The DNA/RNA NS showed excellent biocompatibility, stability and RNase H-responsiveness, enabling on-demand delivery of sensing components and live-cell applications. In the presence of the target miRNA, the cascade amplification of catalytic hairpin assembly (CHA) and hybridization chain reaction (HCR) would be triggered to generate a strong fluorescence signal. Taking miRNA 155 as a model, the developed DNA/RNA NS achieved sensitive detection of the target in vitro and in tumor cells, demonstrating the potential of miRNA-based tumor screening. • A DNA/RNA nanosphere-based cascade signal amplifier was developed. • The DNA/RNA nanosphere was formed by RCR-driven self-assembly. • The RNase H-responsive nanoplatform performed on-demand delivery of multiple sensing elements. • The conducted sensing platform exhibited inherent biocompatible, high sensitivity and excellent specificity. • Both in vitro and in situ imaging of the target microRNA was successfully achieved.
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