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Microchimica Acta

, 186:613 | Cite as

Ratiometric determination of human papillomavirus-16 DNA by using fluorescent DNA-templated silver nanoclusters and hairpin-blocked DNAzyme-assisted cascade amplification

  • Yan Yuan
  • Yanyun Ma
  • Lei Luo
  • Qing Wang
  • Jin Huang
  • Jianbo Liu
  • Xiaohai YangEmail author
  • Kemin WangEmail author
Original Paper
  • 188 Downloads

Abstract

A signal amplification method has been developed for determination of human papillomavirus-16 DNA (HPV-16 DNA). It consists of a combination of using (a) two-color emitting fluorescent DNA-templated silver nanoclusters (DNA-AgNCs); (b) hairpin-blocked DNAzyme probe (H-Dz), and (c) catalytic hairpin assembly. In the absence of the model target HPV-16 DNA, the H-Dz forms a hairpin structure through intramolecular hybridization. It inhibits the catalytic activity of the DNAzyme. However, in the presence of HPV-16 DNA, it will hybridize with the DNAzyme probe which leads to the opening of the hairpin and the formation of an active secondary structure in the catalytic core. This produces an “active” DNAzyme which can cut H-Dz under the catalytic action of Mg(II) ions. Then, the DNA fragment and HPV-16 DNA are separated due to the weak hybridization. The former triggers a downstream catalytic hairpin assembly (CHA). This changes the color of the fluorescence of DNA-AgNCs from red (630 nm) to yellow (570 nm). The HPV-16 DNA will hybridize with another H-Dz to trigger the next round of activation cycle to cut H-Dz. In this way, recycling amplification results in the generation of a strong signal that allows human HPV-16 DNA to be detected with a 5.7 pM detection limit.

Graphical abstract

A simple and effective cascade signal amplification method was developed for fluorometric determination of HPV-16 DNA. It is based on a combination of chameleon fluorescent DNA-AgNC, hairpin-blocked DNAzyme probe and catalytic hairpin assembly (CHA). Target recycling amplification results in significant signal changes, thus providing high detection sensitivity.

Keywords

Chameleon DNA-AgNC DNAzyme Ratiometric Signal amplification HPV 

Notes

Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (21675047, 21735002, 21521063), and the Key Point Research and Invention Program of Hunan Province (2017DK2011).

Compliance with ethical standards

The author(s) declare that they have no competing interests

Supplementary material

604_2019_3732_MOESM1_ESM.doc (144 kb)
ESM 1 (DOC 143 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Key Laboratory for Bio-Nanotechnology and Molecular Engineering of Hunan ProvinceHunan UniversityChangshaChina

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