Exonuclease III assisted exponential amplification reaction (EXPAR) for specific miRNA-155 analysis during post-anesthetic nursing

Abstract The persistent obstacle in precise and sensitive identification of microRNAs (miRNAs) pertains to the advancement of expeditious and effective isothermal amplification methodologies suitable for point-of-care environments and monitoring the cancer prognosis in patients receiving post-anesthetic nursing. The exponential amplification reaction (EXPAR) has attracted considerable interest due to its simplicity and ability to rapidly amplify signals. The practical application of the EXPAR is, nevertheless, severely hampered by the inability to differentiate closely related homologous sequences and to modify the designed templates to suit other targets. A loop-stem template for the EXPAR system was developed in this study to facilitate specific target recognition with the aid of exonuclease III (Exo III). This innovation effectively eliminated non-specific hybridization that could occur between the template and interfering sequences, thereby ensuring minimal background amplification of EXPAR. By modulating Exo III-based target recycling, EXPAR based chain amplification and G4/hemin based color reaction, this method facilitated the precise and sensitive examination of miRNA-155, yielding acceptable yields and a minimal detection limit of 0.43 fM. The approach expedites simple and expeditious molecular diagnostic applications involving short nucleic acids and offers an innovative method for enhancing the selectivity of EXPAR-based techniques, providing a robust tool for monitoring the expression level from patients receiving post-anesthetic nursing and guiding the treatment strategy.