Abstract
The authors describe an electrochemical method for the determination of the single-stranded DNA (ssDNA) oligonucleotide with a sequence derived from the genom of hepatitis B virus (HBV). It is making use of circular strand displacement (CSD) and rolling circle amplification (RCA) strategies mediated by a molecular beacon (MB). This ssDNA hybridizes with the loop portion of the MB immobilized on the surface of a gold electrode, while primer DNA also hybridizes with the rest of partial DNA sequences of MB. This triggers the MB-mediated CSD. The RCA is then initiated to produce a long DNA strand with multiple tandem-repeat sequences, and this results in a significant increase of the differential pulse voltammetric response of the electrochemical probe Methylene Blue at a rather low working potential of −0.24 V (vs. Ag/AgCl). Under optimal experimental conditions, the assay displays an ultrahigh sensitivity (with a 2.6 aM detection limit) and excellent selectivity. Response is linear in the 10 to 700 aM DNA concentration range.
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Schematic of a voltammetric method for the determination of attomolar levels of target DNA. It is based on molecular beacon mediated circular strand displacement and rolling circle amplification strategies. Under optimal experimental conditions, the assay displays an ultrahigh sensitivity with a 2.6 aM detection limit and excellent selectivity.
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Acknowledgements
This work was financially supported by National Natural Science Foundation of China (21403039, 21563006, 21763005), Natural Science Foundation of Guangxi Province (2015GXNSFAA139033, 2016GXNSFBA380118, 2017GXNSFDA198034, 2017GXNSFFA198005), Guangxi Scientific and Technological Development Projects (AD17195081), High-Level-Innovation Team (guijiaoren[2017]38) and Outstanding Scholar Project of Guangxi Higher Education Institutes, and BAGUI Scholar Program of Guangxi Province of China.
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Huang, S., Feng, M., Li, J. et al. Voltammetric determination of attomolar levels of a sequence derived from the genom of hepatitis B virus by using molecular beacon mediated circular strand displacement and rolling circle amplification. Microchim Acta 185, 206 (2018). https://doi.org/10.1007/s00604-018-2744-3
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DOI: https://doi.org/10.1007/s00604-018-2744-3