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• W2311001211 abstract "The sensitivity of structure-switchable electrochemical DNA (E-DNA) sensors is generally limited by the irremovable redox labels that are close to or distant from the sensing interface. To address this issue, we design a semiduplex probe inspired by the stem-loop structure, in which the nicked loop domain can serve as toehold to mediate a target-responsive strand-displacement reaction. Such a reaction can fundamentally eliminate the post-responsive background current that arises from the irremovable probe, and thus improve the sensitivity. This novel toehold E-DNA (tE-DNA) sensor is able to achieve a detection limit as low as 0.2pM, which is lower than that of the classic stem-loop structured sensor by two orders of magnitude. Moreover, the toehold domain endows the sensor an excellent selectivity against a single-base mismatched sequence and high binding kinetics. By combining this heterogeneous surface-based dynamic self-assembly design with a homogeneous enzyme amplification strategy, the sensitivity can be further improved by three orders of magnitude to sub-femtomolar level. Additionally, this unique biosensor presents reliable reusability, and is capable of probing low abundance of target DNA directly in complex matrices, such as human serum, with minimal interference. These advantages make our tE-DNA sensor a promising contender in the E-DNA sensor family for clinical diagnostics." @default.
• W2311001211 created "2016-06-24" @default.
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• W2311001211 date "2016-08-01" @default.
• W2311001211 modified "2023-10-17" @default.
• W2311001211 title "Toehold enabling stem-loop inspired hemiduplex probe with enhanced sensitivity and sequence-specific detection of tumor DNA in serum" @default.
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• W2311001211 doi "https://doi.org/10.1016/j.bios.2016.03.054" @default.
• W2311001211 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27040528" @default.
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