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DNA Zipper Mediated Membrane Fusion for Rapid Exosomal MiRNA Detection
Miao Xie1, Fujun Wang1, Jiapei Yang1
1School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
Analytical Chemistry
|September 16, 2022
Summary
This study introduces a rapid DNA zipper method for detecting exosomal microRNA (miRNA) for early cancer diagnosis. The new approach offers a faster, more convenient alternative to current expensive and time-consuming techniques.
Area of Science:
- Biotechnology
- Molecular Biology
- Nanotechnology
Background:
- Exosomal microRNA (miRNA) detection is crucial for early disease diagnosis and treatment monitoring.
- Current methods for exosomal miRNA detection are often costly and time-intensive, involving multiple steps like exosome enrichment, RNA extraction, and qRT-PCR.
- There is a need for rapid, accurate, and accessible methods for exosomal miRNA detection.
Purpose of the Study:
- To develop a novel DNA zipper-mediated membrane fusion approach for rapid detection of exosomal miRNA.
- To enable quick and accurate cancer diagnosis using exosomal miRNA detection.
- To provide a convenient tool for monitoring therapeutic effects.
Main Methods:
- Construction of a lipid vesicle probe with miR21-targeting molecular beacons (MBs) and surface-loaded zipper DNA constructs (ZDCs).
- Introduction of complementary zipper DNA constructs (cZDCs) onto exosomes.
- Induction of membrane fusion between vesicle probes and exosomes via ZDC-cZDC zipping, triggering MB fluorescence for detection within 30 minutes.
- Utilizing flow cytometry for distinguishing tumor-derived exosomes from normal exosomes.
Main Results:
- Successful development of a DNA zipper-mediated membrane fusion method for exosomal miRNA detection.
- Demonstrated rapid detection of exosomal miR21 within 30 minutes.
- Achieved accurate distinction between tumor-derived exosomes (overexpressing miR21) and normal exosomes using flow cytometry.
- Validated the method with exosomes from cell culture medium and clinical patient serums.
Conclusions:
- The developed DNA zipper approach provides a convenient and rapid method for exosomal miRNA detection.
- This technique holds significant potential for early cancer diagnosis through liquid biopsy.
- The method can be valuable for monitoring therapeutic efficacy during cancer treatment.
