Volume 42, Issue 5 pp. 499-504
Concise Report

Copper-Free Click Chemistry-Mediated Assembly of Single Quantum Dot Nanosensor for Accurately Monitoring Locus-Specific m6A in Cancer Cells

Yue-Ying Li

Yue-Ying Li

Translational Medicine Center, The First Affiliated Hospital of Zhengzhou University, The Academy of Medical Sciences, Henan Institute of Medical and Pharmaceutical Sciences BGI College, Zhengzhou University, Zhengzhou, Henan, 450052 China

These authors contributed equally.

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Ning-Ning Zhao

Ning-Ning Zhao

College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, 250014 China

These authors contributed equally.

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Yi-Xuan Geng

Yi-Xuan Geng

College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, 250014 China

These authors contributed equally.

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Qian Han

Qian Han

School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

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Jian-Ge Qiu

Jian-Ge Qiu

Translational Medicine Center, The First Affiliated Hospital of Zhengzhou University, The Academy of Medical Sciences, Henan Institute of Medical and Pharmaceutical Sciences BGI College, Zhengzhou University, Zhengzhou, Henan, 450052 China

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Bing-Hua Jiang

Corresponding Author

Bing-Hua Jiang

Translational Medicine Center, The First Affiliated Hospital of Zhengzhou University, The Academy of Medical Sciences, Henan Institute of Medical and Pharmaceutical Sciences BGI College, Zhengzhou University, Zhengzhou, Henan, 450052 China

E-mail: [email protected]; [email protected]; [email protected]Search for more papers by this author
Zi-Yue Wang

Corresponding Author

Zi-Yue Wang

College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, 250014 China

E-mail: [email protected]; [email protected]; [email protected]Search for more papers by this author
Chun-Yang Zhang

Corresponding Author

Chun-Yang Zhang

School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189 China

E-mail: [email protected]; [email protected]; [email protected]Search for more papers by this author
First published: 26 October 2023

Dedicated to the Special Issue of Single-Molecule Measurement and Imaging.

Comprehensive Summary

N6-methyladenosine (m6A) plays an important role in embryogenesis, nuclear export, transcription splicing, and protein translation control. Herein, we demonstrate a copper-free click chemistry-mediated assembly of single quantum dot (QD) nanosensor for accurately monitoring locus-specific m6A in cancer cells. The m6A-sensitive endoribonuclease MazF can digest the unmethylated A-RNA, and the intact m6A-RNA then hybridizes with DNA probes a and b to produce a sandwich hybrid, initiating the click chemistry to generate probe a–b ligation product via first tandem ligation detection reaction (LDR) cycle. Subsequently, DNA probes c and d can hybridize with the probe a–b ligation product to generate the probe c–d ligation product via second LDR cycle. Both LDR cycles can be repeated through denaturation and annealing reaction to generate abundant biotin-/fluorophore-modified probe c–d ligation products that can easily assemble on the QD surface to induce distinct fluorescence resonance energy transfer (FRET) between QD and Cy5. This assay can be homogenously performed without the involvement of copper catalyst, m6A-specific antibody, radioactive labeling, ligase enzyme, enzymatic reverse transcription, and next-generation sequencing. Moreover, it can discriminate even 0.01% m6A level in complex samples and accurately measure cellular m6A-RNA expression, providing a promising avenue for clinical diagnostics and biomedical research.image

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