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Updated: Jun 26, 2025
Probe-based Real-time PCR Approaches for Quantitative Measurement of microRNAs
Published on: April 14, 2015
Endogenous mRNA-Driven "One-To-More" Signal Amplification of DNA Probe for Intracellular miR155 Sensing
1Department of Chemistry and Chemical Engineering, Inner Mongolia University, 235 West University Blvd., 010020, Hohhot, China.
Abstract:
The detection of specific intracellular microRNAs could be potentially helpful in understanding the underlying mechanisms of cancer metastasis and invasion. MiRNAs are usually present in lower expression levels, especially in early stage of cancer. Here, we proposed a "one-to-more" amplification strategy for miRNA imaging, by virtue of DNA strand displacements with dual-amplification. This approach involves leveraging high-abundance endogenous mRNA as fuel strand to drive cascade reactions between DNA strands for amplification, enabling the monitoring of low-abundance intracellular microRNA155. Notably, in comparison to the traditional "one-to-one" signal triggering mode, our "one-to-more" amplification strategy led to a remarkable 11.8-fold increase in fluorescence signal. Our approach not only demonstrates a high sensitivity and specificity in detecting miR155, but also allows for discrimination of miR155 expression levels in different cell lines. With the advantages of intracellular signal amplification and reduced background signal, this approach holds substantial potential in the early diagnosis of cancer.
Insights
This study introduces a novel "one-to-more" DNA amplification strategy for sensitive microRNA imaging. The method enhances fluorescence signals for early cancer detection by monitoring low-abundance microRNA155.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Intracellular microRNAs (miRNAs) are crucial biomarkers for understanding cancer metastasis and invasion.
- Low miRNA expression levels, particularly in early-stage cancer, pose challenges for accurate detection and diagnosis.
Purpose of the Study:
- To develop a sensitive and specific method for intracellular miRNA imaging.
- To enable the monitoring of low-abundance microRNAs, such as microRNA155 (miR155), for potential early cancer diagnosis.
Main Methods:
- Proposed a "one-to-more" amplification strategy utilizing DNA strand displacement and dual-amplification.
- Employed high-abundance endogenous messenger RNA (mRNA) as a fuel strand to drive cascade DNA reactions.
- Enabled signal amplification for the detection of low-abundance intracellular miR155.
Main Results:
- Achieved a remarkable 11.8-fold increase in fluorescence signal compared to traditional "one-to-one" methods.
- Demonstrated high sensitivity and specificity in detecting miR155 within cells.
- Successfully discriminated varying miR155 expression levels across different cell lines.
Conclusions:
- The "one-to-more" amplification strategy offers significant advantages for intracellular miRNA imaging, including signal amplification and reduced background noise.
- This approach shows substantial potential for the early diagnosis of cancer through sensitive detection of specific microRNAs.
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