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Detection of miRNA expression in intact cells using activatable sensor oligonucleotides
Byunghee Yoo1, Amol Kavishwar1, Subrata K Ghosh1
1MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02129, USA.
Chemistry & Biology
|January 21, 2014
Summary
This study presents a new method for measuring microRNA (miRNA) expression in live cells using sensor oligonucleotides. The technology enables sensitive detection of specific miRNAs, like miR-10b, linked to breast cancer metastasis.
Area of Science:
- Molecular Biology
- Biotechnology
- Cancer Research
Background:
- MicroRNAs (miRNAs) are crucial regulators of gene expression.
- Profiling miRNA expression in intact cells is essential for understanding cellular processes and disease.
- Existing methods may require cell lysis or lack sensitivity.
Purpose of the Study:
- To develop and validate a novel technology for real-time miRNA expression profiling in intact cells.
- To demonstrate the sensitivity and applicability of the technology for detecting specific cancer-related miRNAs.
Main Methods:
- Utilized dual-labeled, cleavable sensor oligonucleotides complementary to target miRNAs.
- Leveraged the endogenous RNA Induced Silencing Complex (RISC) for sensor cleavage upon target binding.
- Monitored fluorescence turn-on as an indicator of miRNA presence and activity.
- Applied the technology to detect miR-10b in a human breast adenocarcinoma cell line and cell-free systems.
Main Results:
- Developed a fluorescence-based assay for miRNA detection in intact cells.
- Achieved nanomolar sensitivity for miRNA detection.
- Successfully profiled miR-10b expression, a miRNA associated with breast cancer metastasis.
- Demonstrated feasibility in both cell-free and live-cell environments.
Conclusions:
- The developed sensor oligonucleotide technology provides a sensitive and direct method for miRNA profiling in intact cells.
- This approach facilitates the study of miRNA function in cellular contexts, particularly in cancer research.
- The technology holds promise for advancing diagnostics and therapeutic strategies targeting miRNA dysregulation.
