Abstract
A rapid room-temperature DNA nanowires preparation strategy on the basis of self-replicating catalyzed hairpin assembly (SRCHA) was reported. In this system, three hairpin probes (P1, P2, and P3) were well-designed and partially hybridize to each other, and two split trigger DNA sequences were integrated into P1 and P3, respectively. When the SRCHA was initiated by the trigger DNA, a series of DNA assembly steps based on the toehold-mediated DNA strand displacement were activated, and the Y shaped DNA (P1-P2-P3) was formed. In that case, the two split trigger DNA sequences will come into close-enough proximity to form the trigger DNA replicas, which can initiate the additional SRCHA reaction cycles for DNA nanowire preparation, and eventually a rapid room-temperature DNA nanowires preparation strategy without need of fuel strands was successfully developed. Furthermore, the prepared DNA nanowires have been used to develop a rapid and signal amplified sensing platform for sensitive adenosine triphosphate (ATP) detection.
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