Simple super-resolution live-cell imaging based on diffusion-assisted Förster resonance energy transfer

Area of Science:

• Biophysics
• Microscopy
• Cell Biology

Background:

• Conventional fluorescence microscopy lacks the resolution to visualize fine cellular structures.
• Existing super-resolution techniques are often complex, expensive, or incompatible with standard imaging setups.

Purpose of the Study:

• To develop a simple, rapid, general, and cost-efficient super-resolution fluorescence imaging method.
• To enable super-resolution imaging using readily available equipment and fluorophores.

Main Methods:

• Utilized diffusion-assisted Förster resonance energy transfer (FRET) for super-resolution imaging.
• Employed stochastic quenching of donor fluorophores by diffusing acceptor molecules.
• Implemented the method on a standard epi-fluorescence microscope with LED illumination.

Main Results:

• Achieved a two- to three-fold enhancement in spatial resolution.
• Demonstrated significant optical sectioning capabilities.
• Obtained favorable temporal resolution for live-cell dynamic imaging.

Conclusions:

• The proposed diffusion-assisted FRET method offers a simple and cost-efficient approach to super-resolution imaging.
• This technique is compatible with conventional imaging systems and general fluorophores.
• The method is suitable for live-cell dynamic imaging, making super-resolution microscopy more accessible.