Related Experiment Video For Colorectal cancer (CRC)
Updated: Feb 11, 2026

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
Published on: June 8, 2020
DNase I enzyme-aided fluorescence signal amplification based on graphene oxide-DNA aptamer interactions for
Hui Wang1, Hui Chen2, Zhipeng Huang2
1Center of Clinical Experiments, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.
Abstract:
Exosomes have proved to be an effective cancer biomarker with significant potential, and several cell-specific molecules have been found in colorectal cancer (CRC) exosomes. Nevertheless, it is challenging to use exosomes in clinical lab diagnostics due to their nanoscale and the lack of a convenient and effective detection platform. Here, we developed a DNase I enzyme-aided fluorescence amplification method for CRC exosome detection, based on graphene oxide (GO)-DNA aptamer (CD63 and EpCAM aptamers) interactions. The fluorescence of fluorophore-labeled aptamers quenched by GO, recovered after incubation with samples containing CRC exosomes. The DNase I enzyme digested the single-stranded DNA aptamers on the exosome surface and the exosomes were able to interact with more fluorescent aptamer probes, resulting in an increase of signal amplification. The limit of detection for CRC exosomes is 2.1 × 104 particles/μl. Consequently, a rapid and effective method with high sensitivity was established. The method was verified in 19 clinical blood serum samples to distinguish healthy and CRC patients, showing significant diagnostic power. Moreover, it can be expanded to other kinds of cancer exosomes, in addition to CRC.
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