Related Experiment Video
Updated: Jan 10, 2026
Paper-Based Preconcentration and Isolation of Microvesicles and Exosomes
Published on: April 29, 2020
Reduced Graphene Oxide-Based Solid-Phase Extraction for the Enrichment and Detection of microRNA
He Yan1, Youchun Xu2, Ying Lu2
1School of Life Sciences, Tsinghua University , Beijing 100084, China.
Abstract:
MicroRNAs (miRNAs) are endogenous molecules with regulatory functions. The purification and enrichment of miRNA are essential for its precise and sensitive detection. miRNA isolated using commercial kits contains abundant interfering RNAs, and the concentration of miRNA may not be adequate for detection. Herein, we prepared a reduced graphene oxide (rGO)-based magnetic solid-phase extraction material for the enrichment and ultrasensitive detection of miRNA from intricate nucleic acid solutions. In situ reverse transcription (RT) was developed as the most efficient approach to desorb miRNA from rGO among the methods that are compatible for the subsequent amplification reported thus far. Additionally, rolling circle amplification and qPCR were used to detect let-7a with a decrease of the limit of detection by 24.7- and 31.3-fold, respectively. This material was also successfully used to extract and detect miRNA from total RNA isolated from human plasma. Our results show that the material prepared in this study has the potential for cancer biopsy in clinics and the discovery of new miRNAs in scientific research.
Insights
Researchers developed a novel reduced graphene oxide magnetic material for enriching and detecting microRNAs (miRNAs). This method improves sensitivity for potential clinical cancer diagnostics and miRNA discovery.
Area of Science:
- Biochemistry
- Materials Science
- Molecular Biology
Background:
- MicroRNAs (miRNAs) are crucial regulatory molecules.
- Accurate miRNA detection requires effective purification and enrichment.
- Commercial kits often yield impure miRNA with insufficient concentrations.
Purpose of the Study:
- To develop a novel material for miRNA enrichment and ultrasensitive detection.
- To optimize miRNA desorption for subsequent amplification.
- To validate the material's efficacy using human plasma samples.
Main Methods:
- Preparation of reduced graphene oxide (rGO)-based magnetic solid-phase extraction material.
- In situ reverse transcription (RT) for miRNA desorption from rGO.
- Detection using rolling circle amplification and quantitative polymerase chain reaction (qPCR).
Main Results:
- The rGO material effectively enriched and detected miRNA from complex solutions.
- In situ RT proved to be the most efficient desorption method.
- Detection limits for let-7a were significantly reduced (24.7-fold by RCA, 31.3-fold by qPCR).
- Successful miRNA extraction and detection from human plasma total RNA.
Conclusions:
- The developed rGO magnetic material enables ultrasensitive miRNA detection.
- This method shows promise for clinical applications like cancer biopsy.
- It also supports the discovery of novel miRNAs in research settings.
