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• W3209751390 abstract "• A polymerase-aided fluorescent sensor is developed via a dual stage amplification process. • The signal is yielded via modulating fluorescence quenching and recovery events among DNA probes. • The sensing system exhibits an amplified detection sensitivity with a detection limit of 0.38 nM. • This sensor performs quite well in diluted serum sample, with recovery rates of 101.4% and 110.0%. • The mix-and-measure simplicity and dual-stage signal amplification make it a promising method. A sensitive fluorescent strategy for DNA detection is developed based on a dual stage amplification process mediated by DNA polymerase. In the sensing method, there are two kinds of DNA probes used, including a hairpin probe (HP) and a double-stranded DNA (DSD) tagged with a quencher and a fluorophore, respectively. The presence of the target DNA triggers the two-step cyclic amplification reactions with the assistance of DNA polymerase, thus leading to the considerable fluorescence restoration. The experiment conditions are carefully studied to achieve optimal performance, including the construction of DSD, the concentration of HP, the reaction time, and the amounts of polymerase. Under the optimal conditions, the strategy responded linearly to DNA target from 0.5 to 50.0 nM with a relative low detection limit of 0.38 nM (according to 3σ/S rule). Moreover, the method shows good detection performance in serum samples, confirming its practical usage for efficient DNA assay. The mix-and-measure simplicity and dual-stage signal amplification make the developed method a novel way for sensitive detection of DNA." @default.
• W3209751390 created "2021-11-08" @default.
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• W3209751390 date "2022-01-01" @default.
• W3209751390 modified "2023-10-16" @default.
• W3209751390 title "Dual-stage amplified fluorescent DNA sensor based on polymerase-Mediated strand displacement reactions" @default.
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• W3209751390 doi "https://doi.org/10.1016/j.microc.2021.106946" @default.
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