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Construction of a 3D rigidified DNA nanodevice for anti-interference and reinforced biosensing by turning nuclease into a catalyst

纳米器件 生物传感器 核酸酶 DNA DNA纳米技术 纳米技术 计算生物学 生物物理学 生物 化学 材料科学 遗传学
作者
Yinghao Cheng,Guohui Xue,Linwen Lan,Huo Xu,Ruize Cheng,Qiufeng Song,Chan Li,Jing Zhang,Guoqiao Huang,Zhifa Shen,Chang Xue
出处
期刊:Biosensors and Bioelectronics [Elsevier BV]
卷期号:237: 115501-115501 被引量:5
标识
DOI:10.1016/j.bios.2023.115501
摘要

The practical application of DNA biosensors is impeded by numerous limitations in complicated physiological environments, particularly the susceptibility of common DNA components to nuclease degradation, which has been recognized as a major barrier in DNA nanotechnology. In contrast, the present study presents an anti-interference and reinforced biosensing strategy based on a 3D DNA-rigidified nanodevice (3D RND) by converting a nuclease into a catalyst. 3D RND is a well-known tetrahedral DNA scaffold containing four faces, four vertices, and six double-stranded edges. The scaffold was rebuilt to serve as a biosensor by embedding a recognition region and two palindromic tails on one edge. In the absence of a target, the rigidified nanodevice exhibited enhanced nuclease resistance, resulting in a low false-positive signal. 3D RNDs have been proven to be compatible with 10% serum for at least 8 h. Once exposed to the target miRNA, the system can be unlocked and converted into common DNAs from a high-defense state, followed by polymerase- and nuclease-co-driven conformational downgrading to achieve amplified and reinforced biosensing. The signal response can be improved by approximately 700% within 2 h at room temperature, and the limit of detection (LOD) is approximately 10-fold lower under biomimetic conditions. The final application to serum miRNA-mediated clinical diagnosis of colorectal cancer (CRC) patients revealed that 3D RND is a reliable approach to collecting clinical information for differentiating patients from healthy individuals. This study provides novel insights into the development of anti-interference and reinforced DNA biosensors.
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