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Highly sensitive and specific electrochemical biosensor for microRNA-21 detection by coupling catalytic hairpin
Qing Li1, Fanpeng Zeng, Nan Lyu
1Xuzhou Central Hospital, Xuzhou, Jiangsu 221004, China. lyunan8833@sina.com mwlj521@163.com.
The Analyst
|April 21, 2018
Summary
This study presents a sensitive electrochemical biosensor for detecting microRNA-21 using catalytic hairpin assembly and rolling circle amplification. The advanced method achieves a low limit of detection, proving effective for real biological samples.
Area of Science:
- Biochemistry
- Molecular Biology
- Analytical Chemistry
Background:
- MicroRNAs are crucial regulators of gene expression and significant biomarkers.
- Electrochemical biosensors offer a promising platform for sensitive microRNA detection.
Purpose of the Study:
- To develop a highly sensitive electrochemical biosensor for microRNA detection.
- To utilize a dual signal amplification strategy for enhanced detection capabilities.
Main Methods:
- The study employed catalytic hairpin assembly (CHA) and rolling circle amplification (RCA) for signal amplification.
- MiRNA-21 was targeted using an electrochemical biosensor designed with CHA and RCA strategies.
Main Results:
- The developed biosensor demonstrated a wide linear range from 0.5 to 12,500 pmol for microRNA detection.
- An exceptionally low limit of detection (LOD) of 290 fmol for miRNA was achieved.
- The method was successfully validated through the detection of miRNA-21 in HeLa cell samples.
Conclusions:
- The presented electrochemical biosensor offers high sensitivity and speed for microRNA detection.
- The versatile method can be adapted for detecting small molecules and proteins when combined with aptamers.
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