Challenges and limitations of molecular resolution fluorescence imaging

Area of Science:

• Biophysics
• Cell Biology
• Microscopy

Background:

• Super-resolution microscopy (SRM) enables unprecedented insights into cellular molecular organization.
• Recent advancements allow visualization of individual molecules with nanometer precision.

Purpose of the Study:

• To address the challenges of applying SRM for sub-10 nm fluorescence imaging in live cells under physiological conditions.
• To identify limitations and propose strategies for achieving true molecular resolution imaging in cells.

Main Methods:

• Discussion of current SRM method limitations for in vivo molecular imaging.
• Analysis of fluorescence labeling density and fluorophore interactions as key obstacles.
• Exploration of strategies to overcome these challenges for sub-10 nm imaging.

Main Results:

• Established that most nanometer-resolution SRM methods are not directly applicable for molecular resolution imaging in cells.
• Identified high-density covalent labeling and fluorophore energy transfer as major impediments.
• Proposed strategies to circumvent current obstacles for achieving molecular resolution.

Conclusions:

• Achieving true molecular resolution fluorescence imaging in cells requires overcoming significant labeling and photophysical challenges.
• Strategies discussed offer pathways to advance sub-10 nm imaging in physiological cellular environments.
• Further development is needed to fully translate SRM's potential to live-cell molecular imaging.