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Streptavidin-enhanced surface plasmon resonance biosensor for highly sensitive and specific detection of microRNA |
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| Authors: | Decai Zhang Yurong Yan Wei Cheng Wei Zhang Yahui Li Huangxian Ju Shijia Ding |
| Affiliation: | 1. Key Laboratory of Clinical Laboratory Diagnostics (Ministry of Education), College of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, People’s Republic of China 2. Molecular Oncology and Epigenetics Laboratory, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, People’s Republic of China 3. State Key Laboratory of Analytical Chemistry for Life Science, Department of Chemistry, Nanjing University, Nanjing, 210093, People’s Republic of China |
| Abstract: | We are presenting a method for sensitive and specific detection of microRNA (miRNA) using surface plasmon resonance. A thiolated capture DNA probe with a short complete complementary sequence was immobilized on the gold surface of the sensor to recognize the part sequence of target miRNA, and then an oligonucleotide probe linked to streptavidin was employed to bind the another section of the target. The use of the streptavidin-oligonucleotide complex caused a ~5-fold increase in signal, improved the detection sensitivity by a factor of ~24, and lowered the detection limit to 1.7 fmol of miR-122. This specificity allowed a single mismatch in the target miRNA to be discriminated. The whole assay takes 30 min, and the surface of the sensor can be regenerated at least 30 times without loss in performance. The method was successfully applied to the determination of miRNA spiked into human total RNA samples. A surface plasmon resonance (SPR) biosensor was developed for microRNA detection by using streptavidin to enhance SPR signal. |
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