Dual-Mode SERS and Electrochemical Detection of miRNA Based on Popcorn-like Gold Nanofilms and Toehold-Mediated Strand Displacement Amplification Reaction

MicroRNA (miRNA) has emerged as one of the ideal target biomarker analytes for cancer detection because its abnormal expression is closely related to the occurrence of many cancers. In this work, we combined three-dimensional (3D) popcorn-like gold nanofilms as novel surface-enhanced Raman scatterin...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2021-04, Vol.93 (15), p.6120-6127
Main Authors: Zhou, Hong, Zhang, Jishou, Li, Binxiao, Liu, Jing, Xu, Jing-Juan, Chen, Hong-Yuan
Format: Article
Language:English
Subjects:
Amplification
Analytical chemistry
Biomarkers
Biosensors
Cancer
Chemistry
Deoxyribonucleic acid
DNA
Electrochemical analysis
Electrochemistry
Gold
MicroRNAs
miRNA
Molecular machines
mRNA
Raman spectra
Ribonucleic acid
RNA
Selectivity
Sensitivity enhancement
Substrates
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Summary:MicroRNA (miRNA) has emerged as one of the ideal target biomarker analytes for cancer detection because its abnormal expression is closely related to the occurrence of many cancers. In this work, we combined three-dimensional (3D) popcorn-like gold nanofilms as novel surface-enhanced Raman scattering (SERS)-electrochemistry active substrates with toehold-mediated strand displacement reactions (TSDRs) to construct a DNA molecular machine for SERS-electrochemistry dual-mode detection of miRNA. 3D popcorn-like spatial structures generated more active “hot spots” and thus enhanced the sensitivity of SERS and electrochemical signals. Besides, the TSDRs showed high sequence-dependence and high specificity. The addition of target miRNA will trigger the molecular machine to perform two TSDRs in the presence of signal DNA strands modified by R6G (R6G-DNA), thus achieving an enzyme-free amplification detection of miRNA with a low limit of detection of 0.12 fM (for the SERS method) and 2.2 fM (for the electrochemical method). This biosensor can also serve as a universally amplified and sensitive detection platform for monitoring different biomarkers, such as cancer-related DNA, messenger RNA, or miRNA molecules, with high selectivity by changing the corresponding probe sequence.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.0c05221