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Updated: Jan 28, 2026

Simple and Fast Rolling Circle Amplification-Based Detection of Topoisomerase 1 Activity in Crude Biological Samples
Published on: December 2, 2022
Specific and simultaneous detection of micro RNA 21 and let-7a by rolling circle amplification combined with lateral
Mengdi Yao1, Xuefei Lv1, Yulin Deng1
1Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals, School of Life Science, Beijing Institute of Technology, Beijing, China.
Abstract:
Owing to the pivotal function in post transcriptional gene modification, miRNA biomarkers are playing crucial role in tracking and diagnosing various forms of tumors in a short time period. Hence, the need to develop simple, sensitive and specific detection of miRNAs for precise diagnosis arises. This current study is aimed to develop a detecting platform by combining rolling circle amplification with AuNps-based lateral flow strip (LFS-RCA) for simultaneous detection of miRNA 21 and miRNA let-7a. The current methodology is simple, sensitive, specific and selective for miRNA let-7a and miRNA 21 with the limits of detection (LOD) as low as 20 pM and 40 pM, respectively. In this technique, rolling circle amplification is playing an essential role in increasing sensitivity and reducing experimental cost. Moreover, the padlock probe with high specificity can immediately identify the simultaneous amplification of multiple miRNAs targets, which may contribute in saving sample volume and detection time. Hopefully, in future with further development, this developed technique can be chosen as a potential tool for detection of miRNAs in clinical diagnosis.
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