Label-free Detection of MicroRNA: Two-stage Signal Enhancement with Hairpin Assisted Cascade Isothermal Amplification and Light-up DNA-silver Nanoclusters

Overview

Journal Mikrochim Acta

Specialties Biotechnology
Chemistry

Date 2020 Jan 23

PMID 31965324

Citations 3

Authors

Mei Li

Xiong Xu

Zhonggao Zhou

Guohai Xu

Yongrong Xie

Qingyou Cai

Affiliations

Soon will be listed here.

Abstract

A method is described for the determination of microRNAs via two-stage signal enhancement. This is attained by combining hairpin (HP) assisted cascade isothermal amplification with light-up DNA-Ag nanoclusters. A rationally designed dual-functional HP is used, and microRNA-21 is chosen as a model analyte. At the first stage, upon the hybridization of the microRNA-21 with HP, microRNA recycling via polymerase-displacement reaction and a circulative nicking-replication process are achieved. This generates numerous G-abundant overhang DNA sequences. In the second stage, the above-released G-abundant overhang DNA sequences hybridize with the dark green Ag NCs, and this results in the appearance of bright red fluorescence. Thanks to the two signal enhancement processes, a linear dependence between the fluorescence intensity at 616 nm and the concentration of microRNA-21 is obtained in the range from 1 pM to 20 pM with a detection limit of 0.7 pM. The strategy clearly discriminates between perfectly-matched and mismatched targets. The method was applied to the determination of microRNA-21 in a spiked serum sample. Graphical abstractSchematic representation of microRNA detection by integrating hairpin assisted cascade isothermal amplification with light-up DNA Ag nanoclusters. With microRNA, G-abundant overhang DNA sequences from amplification reaction hybridize with dark green Ag nanoclusters to produce a concentration-dependent bright red fluorescence.

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