Journal
MICROCHIMICA ACTA
Volume 186, Issue 12, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3927-2
Keywords
Three-way junction; Exonuclease III; Signal amplify; Toehold; Aptamer; Strand displacement
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Funding
- National Natural Science Foundation of China [31801636]
- National Key Research and Development Program of China [2017YFC1600603]
- Shanghai Sailing Program [18YF1417300]
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A fluorometric method is described for nucleic acid signal amplification through target-induced catalytic hairpin assembly with DNA-templated copper nanoparticles (Cu NPs). The toehold-mediated self-assembly of three metastable hairpins is triggered in presence of target DNA. This leads to the formation of a three-way junction structure with protruding mononucleotides at the 3 ' terminus. The target DNA is released from the formed branched structure and triggers another assembly cycle. As a result, plenty of branched DNA becomes available for the synthesis of Cu NPs which have fluorescence excitation/emission maxima at 340/590 nm. At the same time, the branched structure protects the Cu NPs from digestion by exonuclease III. The unreacted hairpins are digested by exonuclease III, and this warrants a lower background signal. The method can detect ssDNA (24 nt) at low concentration (44 pM) and is selective over single-nucleotide polymorphism. On addition of an aptamer, the strategy can also be applied to the quantitation of thrombin at levels as low as 0.9 nM.
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