Abstract
The authors report on a new approach for the determination of the breast cancer biomarker microRNA-155 (miRNA-155). It is based on the measurement of the fluorescence shift of oligonucleotide-templated copper nanoclusters (DNA-CuNC). A probe DNA was designed that acts as a template for the preparation of CuNC which, under 400 nm excitation, exhibit strong fluorescence enhancement at 490 nm and a 90 nm Stokes shift after binding to target miRNA-155 and formation of a DNA-RNA heteroduplex. Under the optimal conditions, the fluorescence of the DNA-CuNC increases with increasing concentration of miRNA-155 in the range from 50 pM to 10 nM, with a 11 pM detection limit. The assay has excellent selectivity over noncomplementary RNA. The method was applied to the determination of miRNA-155 in the presence of human plasma and saliva.
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The authors thank the research Council of University of Tehran for financial support of this work.
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Borghei, YS., Hosseini, M. & Ganjali, M.R. Fluorescence based turn-on strategy for determination of microRNA-155 using DNA-templated copper nanoclusters. Microchim Acta 184, 2671–2677 (2017). https://doi.org/10.1007/s00604-017-2272-6
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DOI: https://doi.org/10.1007/s00604-017-2272-6