title: Surface plasmon resonance biosensor for highly sensitive detection of microRNA based on DNA super-sandwich assemblies and streptavidin signal amplification.
abstract: MicroRNAs (miRNAs) play an important regulatory role in cells and dysregulation of miRNA has been associated with a variety of diseases, making them a promising biomarker. In this work, a novel biosensing strategy has been developed for label-free detection of miRNA using surface plasmon resonance (SPR) coupled with DNA super-sandwich assemblies and biotin-strepavidin based amplification. The target miRNA is selectively captured by surface-bound DNA probes. After hybridization, streptavidin is employed for signal amplification via binding with biotin on the long DNA super-sandwich assemblies, resulting in a large increase of the SPR signal. The method shows very high sensitivity, capable of detecting miRNA at the concentration down to 9 pM with a wide dynamic range of 6 orders of magnitude (from 1 × 10(-11) M to 1 × 10(-6) M) in 30 min, and excellent specificity with discriminating a single base mismatched miRNA sequence. This biosensor exhibits good reproducibility and precision, and has been successfully applied to the detection of miRNA in total RNA samples extracted from human breast adenocarcinoma MCF-7 cells. It, therefore, offers a highly effective alternative approach for miRNA detection in biomedical research and clinical diagnosis.
authors.affiliation: Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China.
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Ding
authors.affiliation: Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China.
authors.forename: Yurong
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China.
authors.forename: Shengqiang
authors.initials: S
authors.lastname: Li
authors.affiliation: Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China; Molecular Oncology and Epigenetics Laboratory, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Cheng
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521, USA.
authors.forename: Quan
authors.initials: Q
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, China. Electronic address: dingshijia@cqmu.edu.cn.
authors.forename: Shijia
authors.initials: S
authors.lastname: Ding
mesh_terms: D020137:Base Pair Mismatch; D015342:DNA Probes / Q000737:chemistry; D006801:Humans; D061925:Immobilized Nucleic Acids / Q000737:chemistry*; D057230:Limit of Detection; D061986:MCF-7 Cells; D035683:MicroRNAs / Q000032:analysis* / Q000235:genetics; D009693:Nucleic Acid Hybridization; D019809:Streptavidin / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods
chemical_list: D015342:DNA Probes; D061925:Immobilized Nucleic Acids; D035683:MicroRNAs; D019809:Streptavidin
keywords: DNA super-sandwich assemblies; MicroRNA; Signal amplification; Streptavidin; Surface plasmon resonance