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Visual Detection of Mirna Using Peroxidase-Like Catalytic Activity of Dna-Cuncs and Methylene Blue As Indicator Publisher Pubmed



Borghei YS1 ; Hosseini M1, 2 ; Ganjali MR3, 4
Authors
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Authors Affiliations
  1. 1. Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran
  2. 2. Department of Pharmaceutical Biomaterials and Medical Biomaterials Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
  4. 4. Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran

Source: Clinica Chimica Acta Published:2018


Abstract

In this study, we developed a colorimetric method which is primarily based on the limited amount of redox in response to the miRNA target analyte binding for the determination of the miRNA, which is used as a biomarker to confirm the clinical diagnosis of cancers such as breast cancer. This method is on the basis of the peroxidase-like property of DNA templated copper nanoclusters (DNA-CuNCs). In this research, it was found that the DNA (poly T) stabilized green emitting CuNCs which exhibited enzyme-like peroxidase activity. After hybridization of miRNA with DNA-CuNCs probe and duplex formation, CuNCs catalyzed the oxidation of the methylene blue (MB) substrate, which can interact easily with DNA/miR-155 heteroduplex. Applying the optimal conditions, the absorbance of MB decreased by increasing the target miRNA-155 with in a dynamic range from 1.0 pM to 10.0 nM down to a detection limit (LOD) of 0.6 pM. The DNA-CuNCs/MB complex was designed to develop a facile, cheap, and fast colorimetric assay for detection of miRNA through MB oxidation by DNA stabilized CuNCs. © 2018 Elsevier B.V.
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