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Updated: Apr 19, 2026
Real-time Imaging of Single Engineered RNA Transcripts in Living Cells Using Ratiometric Bimolecular Beacons
Published on: August 6, 2014
Second harmonic super-resolution microscopy for quantification of mRNA at single copy sensitivity
Jing Liu1, Il-Hoon Cho, Yi Cui
1Department of Agricultural and Biological Engineering, Bindley Bioscience Center, Birck Nanotechnology Center, Purdue University , West Lafayette, Indiana 47907, United States.
Researchers developed a new super-resolution microscopy technique using barium titanium oxide crystals to precisely quantify mRNA molecules within single cells. This advancement improves disease diagnosis and therapeutic evaluation by offering superior specificity and selectivity for transcript detection.
Area of Science:
- Molecular Biology
- Biophysics
- Nanotechnology
Background:
- Accurate quantification and localization of mRNA in single cells are crucial for understanding cellular processes, disease states, and treatment responses.
- Current methods for detecting mRNA beyond the diffraction limit face limitations due to probe optical properties and microscopy techniques.
Purpose of the Study:
- To develop and validate a novel super-resolution microscopy technique for sensitive mRNA quantification at the single-cell level.
- To utilize nanosized barium titanium oxide (BaTiO3) crystals as probes for enhanced mRNA detection.
Main Methods:
- Employed second harmonic super-resolution microscopy (SHaSM) with BaTiO3 nanoparticles as probes.
- Quantified human epidermal growth factor receptor 2 (Her2) mRNA copies in SK-BR-3, MCF-7, and HeLa cell lines.
- Validated results using fluorescence in situ hybridization and quantitative PCR.
Main Results:
- Achieved single-copy detection sensitivity for Her2 mRNA with a resolution of 55.6 nm using SHaSM.
- Quantified Her2 mRNA per cell: SK-BR-3 (595±79.1), MCF-7 (38.9±8.26), and HeLa (1.5±2.8).
- Demonstrated superior specificity and selectivity compared to existing single-molecule transcript detection methods.
Conclusions:
- The developed SHaSM approach offers high-resolution, sensitive mRNA quantification in single cells.
- This technique has the potential to resolve up to ~10^4 transcripts per cell and monitor transcriptional dynamics in real-time.
- The method shows significant promise for clinical research and early diagnosis of diseases like cancer.
