DNAzyme Feedback Amplification: Relaying Molecular Recognition to Exponential DNA Amplification. Issue 18 (1st February 2018)

• Record Type: Journal Article
• Authors: Liu, Meng; Yin, Qingxin; McConnell, Erin M.; Chang, Yangyang; Brennan, John D.; Li, Yingfu
• Is Part Of: Chemistry. Volume 24:Issue 18(2018)
• Page Start: 4473
• Page End: 4479
• Publication Date: 2018-02-01
• Subjects: biosensors -- DNA -- exponential amplification -- RNA cleavage -- rolling circle amplification; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201705338
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Technologies capable of linking DNA amplification to molecular recognition are very desirable for ultrasensitive biosensing applications. We have developed a simple but powerful isothermal DNA amplification method, termed DNAzyme feedback amplification (DFA), that is capable of relaying molecular recognition to exponential DNA amplification. The method incorporates both an RNA‐cleaving DNAzyme (RCD) and rolling circle amplification (RCA) carried out by a special DNA polymerase using a circular DNA template. DFA begins with a stimulus‐dependent RCA reaction, producing tandemly linked RCDs in long‐chain DNA products. These RCDs cleave an RNA‐containing DNA sequence to form additional primers that hybridize to the circular DNA molecule, giving rise to DNA assemblies that act as the new inputs for RCA. The RCA reaction and the cleavage event keep on feeding each other autonomously, resulting in exponential growth of repetitive DNA sequences that can be easily detected. This method can be used for the detection of both nucleic acid based targets and non‐nucleic acid analytes. In this article, we discuss the conceptual framework of the feedback amplification approach, the essential features of this method as well as remaining challenges and possible solutions. Abstract : Exponential amplification using DNAzymes : Autonomous, multi‐step isothermal amplification is achieved using two DNA complexes that are designed to link a DNA polymerase (DP) and a DNAzyme (DZ) so that a small number of targets produce large amounts of DNA amplicons for biosensing applications.