Abstract
The authors describe a method for DNA target recognition and signal amplification that is based on the target-induced formation of a three way junction. The subsequent assembly of two DNA probes releases the inhibitory strand and triggers a downstream strand displacement amplification. This causes the formation of a G-rich single sequence that binds to a hemin monomer with its peroxidase-mimicking properties. The resulting peroxidase (POx) activity is quantified by using H2O2 and TMB as the substrate. In the presence of an inhibitor, in contrast, the POx-like activity is strongly reduced. This forms the basis for a highly sensitive DNA assay. It has a 0.8 pM detection limit when operated at a wavelength of 450 nm and was applied to the isothermal determination of target DNA with high selectivity.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant nos. 81271917), Natural Science Foundation of Zhejiang province (Grant nos. LY14H200002, LY15H200002 and LY16H160023). We thank Clinical Research Centre from the Second Affiliated Hospital of Zhejiang University School of Medicine for essential technical supports.
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Xuchu Wang and Weiwei Liu contributed equally to this work.
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Wang, X., Liu, W., Yin, B. et al. An isothermal strand displacement amplification strategy for nucleic acids using junction forming probes and colorimetric detection. Microchim Acta 184, 1603–1610 (2017). https://doi.org/10.1007/s00604-017-2158-7
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DOI: https://doi.org/10.1007/s00604-017-2158-7