In traditional isothermal exponential amplification reaction(EXPRA),the target nucleic acid has the same energy at both ends of the symmetrical amplification template. However,when the target nucleic acid hybridizes with the 5' end of the template,amplification becomes difficult to trigger,limiting the method's use in the analysis of trace amounts of target nucleic acids. To address this issue,this study introduces a highly sensitive and rapid analytical method for microRNA detection,employing asymmetric hybridization-induced isothermal exponential amplification reaction(AEXPRA),with miR-196b as the target. An asymmetric linear amplification template was meticulously designed,enabling miR-196b to fully hybridize to the 3' end of the template due to complete complementarity,while only partially complementing the 5' end. This innovative approach boasts high sensitivity,strong specificity,and rapid detection capabilities. The entire reaction time is efficiently contained within 30 minutes,allowing for the detection of as low as 0.42 amol/L of miR-196b. To validate the practical applicability of this method,it was utilized to analyze miR-196b levels in serum extracts. Remarkably,the method effectively distinguished miR-196b expression levels between non-small cell lung cancer patients and healthy controls,with results that were consistent with those obtained through RT-qPCR,thereby demonstrating high accuracy and reliability. Consequently,this AEXPAR method holds substantial promise for advancing clinical diagnosis and pathological research in the realm of miRNAs.
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