Multiplexed 3D cellular super-resolution imaging with DNA-PAINT and Exchange-PAINT.

Area of Science:

• Biophysics
• Molecular Biology
• Nanotechnology

Background:

• Super-resolution fluorescence microscopy offers high-resolution biological imaging.
• Multiplexed imaging for numerous targets is a significant challenge in the field.
• Existing methods often require complex setups or multiple dyes and lasers.

Purpose of the Study:

• To develop a simple and effective method for multiplexed super-resolution imaging.
• To achieve sub-10-nm spatial resolution in biological samples.
• To demonstrate multicolor imaging capabilities in vitro and in fixed cells.

Main Methods:

• Utilized transient binding of short fluorescently labeled oligonucleotides (DNA-PAINT).
• Developed a sequential imaging approach (Exchange-PAINT) using a single dye and laser.
• Applied these techniques to synthetic DNA structures and fixed biological cells.

Main Results:

• Achieved sub-10-nm spatial resolution in vitro.
• Demonstrated ten-color super-resolution imaging on synthetic DNA structures.
• Successfully performed four-color 2D and three-color 3D imaging of proteins in fixed cells.

Conclusions:

• DNA-PAINT and Exchange-PAINT offer a simplified approach to multiplexed super-resolution microscopy.
• These methods are versatile, enabling high-resolution imaging across various biological contexts.
• The techniques pave the way for more detailed investigations of complex biological systems.