DNA
小RNA
细胞内
连接器
色散(光学)
纳米技术
生物物理学
计算生物学
化学
材料科学
计算机科学
生物
物理
生物化学
基因
光学
操作系统
作者
Huimin Bai,Yurong Yan,Dandan Li,Ningke Fan,Wenqian Cheng,Wei Yang,Huangxian Ju,Xinmin Li,Shijia Ding
标识
DOI:10.1016/j.bios.2021.113821
摘要
Localized DNA circuits have shown good performance regarding reaction rate and sensitivity for sensing intracellular microRNAs (miRNAs). However, these methods reported recently require large kinds of DNA strands and suffer from low signal-to-background (S/B) ratio, which hinder their clinical application. To circumvent these issues, we herein developed a novel strategy for sensitive sensing and imaging miRNAs in living cells based on dispersion-to-localization of catalytic hairpin assembly (DL-CHA). This strategy consists of only three classes of DNA strands (two hairpins and a linker strand), which largely reduces sequence design complexity. Additionally, owing to the unique engineering of the substrate transformation from dispersion to localization, the DL-CHA exhibits not only minimal background leakage but also intensive signal amplification, thus significantly improving the S/B ratio. In particular, the simple sensing method is capable of imaging miRNAs in cells from clinical blood samples for the diagnosis of breast cancer. Therefore, this work provides a powerful tool for intracellular molecules detection and gives a much broader design space for constructing high-performance DNA circuits.
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