Ultrahigh-throughput single-molecule spectroscopy and spectrally resolved super-resolution microscopy

Area of Science:

• Biophysics
• Microscopy
• Spectroscopy

Background:

• Super-resolution microscopy enables visualization of cellular structures below the diffraction limit.
• Distinguishing spectrally similar fluorophores in super-resolution imaging remains a challenge.
• Accurate 3D localization of single molecules is crucial for high-resolution imaging.

Purpose of the Study:

• To develop a super-resolution microscopy technique capable of spectrally resolving multiple dyes simultaneously.
• To achieve 'true-color' 3D super-resolution imaging with high resolution and minimal crosstalk.
• To enable rapid acquisition and analysis of spectrally resolved single-molecule data.

Main Methods:

• Implementation of a wide-field spectral measurement scheme.
• Utilizing photoswitching for single-molecule localization.
• Development of spectrally resolved stochastic optical reconstruction microscopy (SR-STORM).

Main Results:

• Synchronous acquisition of fluorescence spectra and positions for ~10^6 single molecules in minutes.
• Achieved spectrally resolved, 'true-color' 3D super-resolution microscopy.
• Demonstrated cross-talk-free 3D imaging of four dyes with 10 nm emission spectral separation.
• Obtained excellent resolution in all channels with automatic alignment of 3D localizations.

Conclusions:

• SR-STORM provides a powerful tool for multicolor super-resolution imaging.
• The method overcomes spectral crosstalk limitations in conventional super-resolution techniques.
• Enables high-resolution, 3D visualization of complex biological structures with unprecedented spectral detail.