Cryopreservation of DNA Origami Nanostructures

Area of Science:

• Nanotechnology
• Biophysics
• Materials Science

Background:

• DNA origami nanostructures are versatile tools in research.
• Their stability is limited outside assembly conditions, particularly in different buffers or temperatures.
• Efficient cryopreservation is crucial for their broader application.

Purpose of the Study:

• To investigate methods for cryopreservation of 2D and 3D DNA origami nanostructures.
• To evaluate the impact of repeated freezing and thawing cycles on nanostructure integrity.
• To assess the efficacy of cryoprotectants in preserving DNA origami structures.

Main Methods:

• Subjecting 2D and 3D DNA origami nanostructures to multiple freeze-thaw cycles.
• Analyzing structural integrity using appropriate characterization techniques.
• Testing the protective effects of glycerol and trehalose at various concentrations.

Main Results:

• 2D DNA origami maintained integrity over 32 freeze-thaw cycles, but ice crystals increased sensitivity.
• 3D DNA origami showed no damage after 32 cycles, but significant fragmentation occurred after 1000 cycles.
• Glycerol and trehalose (0.2–200 mM) effectively protected nanostructures without altering shape.

Conclusions:

• DNA origami nanostructures can be cryopreserved for extended periods.
• Cryoprotectants are essential for mitigating freeze-thaw damage, especially for long-term storage.
• This research enables technological and medical applications requiring stable DNA origami storage.