An ultrasensitive and simple assay for the Hepatitis C virus using a reduced graphene oxide-assisted hybridization chain reaction

Literature Information

Publication Date 2019-05-16
DOI 10.1039/C9AN00179D
Impact Factor 4.616
Authors

Jialong Fan, Liqun Yuan, Qingxin Liu, Chunyi Tong, Wenmiao Wang, Feng Xiao, Bin Liu, Xuanming Liu


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Abstract

Hepatitis C virus (HCV) is a major cause of chronic liver disease, which affects 2–3% of the world population. Until now, the early detection of HCV has been a great challenge, especially for those who live in developing countries. In this study, we developed a novel and ultrasensitive assay for the detection of HCV RNA based on the reduced graphene oxide nanosheets (rGONS) and hybridization chain reaction (HCR) amplification technique. This detection system contains a pair of single fluorophore-labeled hairpin probes that can freely exist in the solution in the absence of target RNA. The introduction of target RNA can robustly trigger a HCR with the two probes and produce long nanowires containing a double-stranded structure. The weak adsorption to rGONS makes the long nanowires emit a strong fluorescence. Using this enzyme-free amplification strategy, we developed a new method for the HCV RNA assay with a detection limit of 10 fM, which is far more sensitive than the common GO-based fluorescence method. Furthermore, the new method exhibits high selectivity for the discrimination of perfectly complementary and mismatched sequences. Finally, the new method was successfully used as a HCV RNA assay in biological samples with a strong anti-interference capability in complicated environments. In summary, these remarkable characteristics of the new method highlight its potential use in a clinical sample primary screening.

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DOI: 10.1039/JA988030254R

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