Abstract
A CHA-based fluorescent DNA tetrahedral probe (FDTp) has been designed to detect the microRNAs miR-21 and miR-155 sensitively and specifically in living cells. The design consisted of functional elements (H1, H2, and Protector) connected to a DNA tetrahedron modified with two pairs of fluorophores and quenching groups. In the presence of miR-21, the chain displacement effect was triggered and Cy3 fluorescence was emitted. In the presence of miR-155, the signal of the catalytic hairpin assembly (CHA) between H1 and H2 on FDTp was amplified, making the fluorescence of FAM sensitive to miR-155. Using this method, the detection limit for miR-155 was 5 pM. The FDTp successfully imaged miR-21 and miR-155 in living cells and distinguished a variety of cell lines based on their expression levels of miR-21 and miR-155. The detection and imaging of dual targets in this design ensured the accuracy of tumor diagnosis and provided a new method for early tumor diagnosis.
Graphical abstract
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Availability of data and materials
The datasets used or analysed during the current study are available from the corresponding author on reasonable request.
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This work was supported by the National Natural Science Foundation of China (No. 82072058, No. 82230070).
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Shan Wang1 and Jiejie Guang1 contributed equally to this work. All authors have approved the final version of the manuscript.
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Wang, S., Guang, J., Gao, Y. et al. Fluorescent DNA tetrahedral probe with catalytic hairpin self-assembly reaction for imaging of miR-21 and miR-155 in living cells. Microchim Acta 191, 462 (2024). https://doi.org/10.1007/s00604-024-06529-4
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DOI: https://doi.org/10.1007/s00604-024-06529-4