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10:20
Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
Published on: September 5, 2019
8.8K
Simultaneous Multicolor Single-Molecule Tracking with Single-Laser Excitation via Spectral Imaging
Tao Huang1, Carey Phelps1, Jing Wang1
1Department of Biomedical Engineering, OHSU Center for Spatial Systems Biomedicine, and Knight Cancer Institute, Oregon Health and Science University, Portland, Oregon.
Biophysical Journal
|February 6, 2018
Summary
This study introduces a novel single-laser, single-objective spectral imaging method for multicolor single-molecule tracking (SMT) in live cells. This technique overcomes spectral crosstalk challenges, enabling simultaneous tracking of multiple fluorescent species with high resolution.
Area of Science:
- Biophysics
- Cell Biology
- Microscopy
Background:
- Single-molecule tracking (SMT) provides insights into biological dynamics.
- Multicolor SMT is hindered by spectral crosstalk and multiple laser requirements.
Purpose of the Study:
- To develop a single-laser, single-objective spectral imaging approach for multicolor live-cell SMT.
- To overcome limitations of existing multicolor SMT techniques.
Main Methods:
- Utilized a single objective to collect fluorescence signals.
- Split signals into positional and spectral channels for combined analysis.
- Employed dual-channel spectral calibration to maintain resolution during molecular motion.
Main Results:
- Achieved spatial resolution of 20-40 nm and spectral resolution of 10-15 nm.
- Successfully demonstrated three-color SMT using spectrally proximal fluorophores and single-laser excitation.
- Reliably extracted trajectories of each species with minimal crosstalk.
Conclusions:
- The developed method enables efficient multicolor SMT in live cells using a single laser.
- This approach offers a flexible and high-resolution alternative for studying molecular dynamics.
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