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Updated: Jan 15, 2026
Probe-based Real-time PCR Approaches for Quantitative Measurement of microRNAs
Published on: April 14, 2015
A Pipette-Tip-Based Point-of-Care Test Platform for Detection of MicroRNA at Subfemtomolar Concentrations Using
Mohammad Sadraeian1,2, Jiajia Zhou1,2, Jiayan Liao1
1Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia.
Researchers developed a novel pipet-tip assay for sensitive detection of microRNAs (miRNAs) linked to cancer. This cost-effective platform enhances early disease diagnosis at the point-of-care.
Area of Science:
- Biomarkers and Diagnostics
- Nanotechnology in Medicine
- Molecular Biology
Background:
- MicroRNAs (miRNAs) are crucial early disease biomarkers.
- Existing ultrasensitive assays are not suitable for point-of-care testing (POCT).
- Detection of low-abundance miRNAs remains a significant challenge in diagnostics.
Purpose of the Study:
- To present a novel pipet-tip platform for quantitative detection of oncogenic miR-27a.
- To enhance sensitivity and specificity for miRNA detection.
- To provide a simplified, rapid, and cost-effective solution for POCT.
Main Methods:
- Utilized a sandwich hybridization strategy with biotinylated capture oligos on microbeads.
- Employed upconversion nanoparticle (UCNP)-conjugated oligos as the reporting probe.
- Incorporated highly doped UCNPs and leveraged dynamic bead-oligo complex mobility within a pipet tip for improved efficiency.
Main Results:
- Achieved a limit of detection (LOD) of 158 attomolar (aM) for miR-27a.
- Demonstrated a linear detection range from 128 aM to 2.05 fM.
- Reported a 33-fold signal advantage over mismatched strands, indicating high specificity.
Conclusions:
- The developed pipet-tip platform offers a sensitive, rapid, and cost-effective method for detecting low-abundance miRNAs.
- The platform's scalability and minimal instrumentation requirements support its potential for advanced molecular diagnostics and POCT.
- Functionalized miRNA-beads can be reused, further enhancing the platform's cost-effectiveness and sustainability.
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