Surface plasmon resonance biosensor for highly sensitive detection of microRNA based on DNA super-sandwich assemblies and streptavidin signal amplification.
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.
['Ding|Xiaojuan|X|', 'Yan|Yurong|Y|', 'Li|Shengqiang|S|', 'Zhang|Ye|Y|', 'Cheng|Wei|W|', 'Cheng|Quan|Q|', 'Ding|Shijia|S|']
D020137:Base Pair Mismatch D015342:DNA Probes D006801:Humans D061925:Immobilized Nucleic Acids D057230:Limit of Detection D061986:MCF-7 Cells D035683:MicroRNAs D009693:Nucleic Acid Hybridization D019809:Streptavidin D020349:Surface Plasmon Resonance
Surface plasmon resonance MicroRNA DNA super-sandwich assemblies Streptavidin Signal amplification