Simple and aberration-free 4color-STED--multiplexing by transient binding

Area of Science:

• Microscopy
• Molecular Biology
• Biochemistry

Background:

• Multicolor fluorescence microscopy is crucial for studying molecular interactions and superresolution imaging.
• Multicolor imaging is technically challenging for Stimulated Emission Depletion (STED) microscopy due to its requirement for multiple laser lines per color.

Purpose of the Study:

• To develop a straightforward method for extending single-color STED microscopes to multichannel capabilities.
• To enable multicolor imaging without altering the existing optical setup.

Main Methods:

• A DNA-based labeling technique using complementary DNA sequences was employed.
• Short single-stranded DNA sequences were attached to target structures.
• Fluorescently labeled complementary DNA sequences were added sequentially for transient binding and imaging.
• Washing steps removed labeled sequences before adding new ones for multiplexing.

Main Results:

• The method successfully enabled multichannel imaging on a single-color STED microscope.
• The approach did not require modifications to the optical setup.
• Multiplexing was achieved using a single fluorophore, minimizing optical aberrations.

Conclusions:

• This DNA-based labeling strategy offers an accessible and efficient way to achieve multicolor STED microscopy.
• The technique overcomes the technical challenges of multicolor imaging in STED microscopy.
• It provides a versatile solution for advanced fluorescence imaging applications.