Abstract
In this study, a biosensing system based on nicking-enhanced rolling circle amplification (N-RCA) was proposed for the highly sensitive detection of cancer-related let-7a microRNA (miRNA). The sensing system consists of a padlock probe (PP), which contains a target recognition sequence and two binding sites for nicking endonuclease (NEase), and molecular beacon (MB) as reporting molecule. Upon hybridization with let-7a, the PP can be circularized by ligase. Then, the miRNA acted as polymerization primer to initiate rolling circle amplification (RCA). With the assistance of NEase, RCA products can be nicked on the cyclized PP and are displaced during the subsequent duplication process, generating numerous nicked fragments (NFs). These NFs not only induce another RCA reaction but also open the molecular beacons (MBs) via hybridization, leading to significantly amplified fluorescence signal. Under the optimized conditions, this method exhibits high sensitivity toward target miRNA let-7a with a detection limit of as low as 10 pM, a dynamic range of three orders of magnitude is achieved, and its family member is easily distinguished even with only one mismatched base. Meanwhile, it displays good recovery and satisfactory reproducibility in fetal bovine serum (FBS). Therefore, these merits endow the newly proposed N-RCA strategy with powerful implications for miRNA detection.
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Funding
This work was supported by the National Natural Science Foundation of China (NSFC) (grant no: 21775024) and Zhejiang Province Natural Science Foundation of China (LY16C07002).
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This study was approved by the ethical review committee of The First Affiliated Hospital of Wenzhou. Written informed consent was obtained by the volunteer the human serum sample was obtained from.
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Gao, Z., Wu, C., Lv, S. et al. Nicking-enhanced rolling circle amplification for sensitive fluorescent detection of cancer-related microRNAs. Anal Bioanal Chem 410, 6819–6826 (2018). https://doi.org/10.1007/s00216-018-1277-2
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DOI: https://doi.org/10.1007/s00216-018-1277-2