Improving the resolution of fluorescence nanoscopy using post-expansion labeling microscopy.

Area of Science:

• Cell Biology
• Microscopy
• Molecular Imaging

Background:

• Electron microscopy (EM) traditionally provides nanometric resolution for cell ultrastructure.
• Super-resolution (SR) fluorescence microscopy approaches molecular dimensions but often lacks EM's ultrastructural detail.
• Limitations persist in visualizing nanometric molecular assemblies with current SR and ExM methods.

Purpose of the Study:

• To review the potential of expansion microscopy (ExM) for visualizing cell ultrastructure.
• To discuss limitations in SR and ExM for nanometric molecular assembly visualization.
• To explore how post-labeling expansion can enhance molecular cartography.

Main Methods:

• Review of current super-resolution (SR) and expansion microscopy (ExM) techniques.
• Analysis of resolution limitations in advanced microscopy methods.
• Discussion of post-labeling strategies for enhanced molecular visualization.

Main Results:

• SR microscopy offers high spatial resolution but doesn't consistently match EM's ultrastructural detail.
• ExM shows potential for revealing cell ultrastructure.
• Existing SR and ExM methods have limitations in visualizing nanometric molecular assemblies.

Conclusions:

• ExM holds significant potential for visualizing cell ultrastructure with high detail.
• Post-labeling expansion strategies may overcome current resolution barriers in ExM and SR.
• Enhanced ExM could enable unprecedented molecular cartography of cells.