Self-Blinking Dyes Unlock High-Order and Multiplane Super-Resolution Optical Fluctuation Imaging

Area of Science:

• Biophysics
• Optical Microscopy
• Nanotechnology

Background:

• Super-resolution imaging typically requires controlled fluorophore switching, often needing intense lasers or specific buffers.
• Self-blinking fluorophores spontaneously switch between fluorescent and non-fluorescent states, offering a simpler alternative.

Purpose of the Study:

• To explore the synergy between super-resolution optical fluctuation imaging (SOFI) and self-blinking fluorophores for advanced 2D and 3D imaging.
• To demonstrate the utility of SOFI with spontaneously switching dyes for high-resolution microscopy.

Main Methods:

• Utilized super-resolution optical fluctuation imaging (SOFI) analysis of fluorescence fluctuations.
• Applied SOFI to spontaneously switching fluorophores for 2D and 3D imaging.
• Investigated biplane and multi-plane data acquisition for volumetric imaging.

Main Results:

• Achieved 2D super-resolution imaging with 50-60 nm resolution using 6th order SOFI.
• Extended 3D cross-cumulant analysis to 4th order, enabling imaging with up to 29 depth planes.
• Demonstrated low laser power requirements suitable for live-cell imaging and time-resolved studies.

Conclusions:

• Self-blinking SOFI provides a robust and user-friendly method for 2D and 3D super-resolution imaging.
• This technique accommodates a wide range of labeling densities and dye behaviors, overcoming limitations of other methods.
• Offers a promising alternative for high-resolution imaging, including live-cell dynamics.