Extra kinetic dimensions for label discrimination

Area of Science:

• Biophysics
• Molecular Biology
• Optical Imaging

Background:

• Fluorescence is a sensitive technique for biomolecule detection.
• Current fluorescence methods struggle with label discrimination due to broad spectral bands and limited fluorophore diversity.
• Reversibly photoswitchable fluorophores (RSFs) offer potential for improved multiplexing.

Purpose of the Study:

• To overcome limitations in fluorescence label discrimination.
• To develop a method for identifying spectrally similar RSFs.
• To expand multiplexing capabilities in fluorescence imaging.

Main Methods:

• Utilized reversibly photoswitchable fluorophores (RSFs) illuminated at varying light intensities.
• Introduced kinetic dimensions to create unique photochemical reactivity fingerprints for each RSF.
• Employed a chromatic aberration-free kinetic fingerprinting approach.

Main Results:

• Successfully identified and discriminated up to 20 out of 22 spectrally similar RSFs.
• Achieved discrimination in under 1 second.
• Demonstrated the method's effectiveness with limited hardware and minimal data processing.

Conclusions:

• The kinetic fingerprinting strategy significantly enhances label discrimination in fluorescence imaging.
• This approach expands the multiplexing capacity of fluorescence-based detection.
• The technique offers a promising pathway for advanced biomolecular analysis.