Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 348, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130713
Keywords
Homogeneous electrochemical aptasensor; Binding-induced DNA strand displacement; CRISPR; Cas12a; Rolling circle amplification
Funding
- National Natural Science Foundation of China [21675131]
- Natural Science Foundation of Chongqing [cstc2020jcyj-zdxmX0003]
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The study combines electrochemical aptasensors with the CRISPR/Cas12a strategy, utilizing BIDSD, RCA, and CRISPR/Cas12a mechanisms to achieve specific and sensitive detection of thrombin with a calculated limit of detection of 1.26 fM, while simplifying the operation steps by omitting the probe surface-immobilization procedure.
Electrochemical aptasensors have been wildly used in the detection and quantification of protein biomarkers, but their practical applications are limited by inefficient signal amplification and laborious and time-consuming probe surface-immobilization procedure. Here, we combine the homogeneous electrochemical aptasensor with the CRISPR/Cas12a strategy to overcome such limitations. The binding-induced DNA strand displacement (BIDSD) strategy is designed to transform thrombin-aptamer interaction into nucleic acid output, which further triggers the rolling circle amplification (RCA) to regulate the deoxyribonuclease activity of CRISPR/Cas12a. Based on the difference in affinity of graphene to single-stranded DNA and double-stranded DNA, this electrochemical aptasensor is free of probe surface-immobilization procedure, which greatly simplifies operation steps and facilitates its flexibility. By integrating BIDSD with two amplification strategies of RCA and CRISPR/Cas12a, this electrochemical aptasensor achieves specific and sensitive detection of thrombin with a calculated limit of detection of 1.26 fM, which provides a paradigm for the sensitive detection of protein biomarker.
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