期刊
TALANTA
卷 239, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2021.123137
关键词
miRNA; DNAzyme; Fluorescence; Ultrasensitive determination; Isothermal amplification reaction
资金
- National Natural Science Foundation of China [22004059, 21974153, 21874064]
- Scientific Technology Project of Guangzhou City [202102020640, 201604020145, 201904010410]
Sensitive, specific, and rapid methods for detecting microRNAs (miRNAs) are crucial for disease diagnosis and therapy. In this study, a novel intramolecular DNAzyme assembly method was developed for highly specific miRNA analysis. Compared to traditional DNAzyme-based assembly methods, this approach showed significantly improved analytical performance in terms of dynamic range, assay sensitivity, and speed. The method demonstrated specific detection of miRNA with a remarkably low detection limit.
Sensitive, specific and rapid methods for detecting microRNAs (miRNAs) play critical roles in disease diagnosis and therapy. Enzyme-free amplification techniques based on DNAzyme assembly have recently been developed for the highly specific miRNA analysis. However, traditional DNAzyme-based assembly (free DNAzyme) am-plifiers is mainly dependent on the target-induced split DNAzyme fragments to assemble into activated DNAzyme structures, which have made a compromise between the sensitivity and specificity due to the random diffusion of dissociative probes in a bulk solution with poor kinetics. Herein, based on a rationally designed DNA probe, we developed an intramolecular DNAzyme assembly (intra-DNAzyme) method to overcome these challenges. The miR-373 is used as model analyte for our current proof-of-concept experiments. Compared with the free-DNAzyme method, our method showed significantly improved analytical performance in terms of dynamic range, assay sensitivity and speed. This method can detect miR-373 specifically with a detection limit as low as 4.3 fM, which is about 83.7 times lower than the previous free-DNAzyme method. This intra-DNAzyme strategy would be of great value in both basic research and clinical diagnosis.
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