Ligase-based ultrasensitive detection of DNAzyme cleavage product using molecular beacon

Detection for deoxyribozyme (DNAzyme) cleavage usually needs complex and time-consuming radial labeling, gel electrophoresis and autoradiography. A new approach was reported for detection DNAzyme cleavage product based on molecular beacon (MB). Part of the loop of MB was designed to complementary to DNAzyme cleavage product. MB was employed to monitor ligation process of RNA/DNA complex and to convert directly cleavage product information into fluorescence signal. Detection limit of the assay is 0.02 nmol/L. The cleavage product of 8−17 DNAzyme against HCV-RNA was detected perfectly based on this assay. The method is fast, simple and ultrasensitive, which might hold great promise in DNAzyme reaction and DNAzyme gene therapy.