Mismatch-Induced Toehold-Free Strand Displacement Used to Control a DNA Nanodevice

Researchers from the State University of New York (SUNY) Albany have developed a novel method to control the reconfiguration of DNA nanostructures using mismatched base pairs and stability differences. This approach, known as mismatch-induced toehold-free strand displacement, was demonstrated using simple DNA duplexes and applied to a paranemic crossover (PX) DNA-based nanodevice, allowing for the conversion of the PX to its topoisomer juxtaposed (JX) DNA form. The efficiency of the strand displacement was shown to be lower in complex nanostructures, but increasing the number of mismatches improved the conversion process.

Key Takeaways:

• Researchers from SUNY Albany have developed a method to control DNA nanostructures using mismatched base pairs and stability differences.
• The method, called mismatch-induced toehold-free strand displacement, uses a single-stranded extension to bind to a DNA or RNA strand, causing branch migration and displacement of previously bound DNA.
• The approach was demonstrated using simple DNA duplexes and applied to a PX DNA-based nanodevice, allowing for the conversion of PX to JX DNA.
• The efficiency of the strand displacement was lower in complex nanostructures, but increasing the number of mismatches improved the conversion process.
• The device can be useful in stimuli-responsive mechanisms with applications in biosensing, drug delivery, and molecular computation.
• The method has the potential to be controlled by tuning the number of mismatches.
• The research has been peer-reviewed and published in Acs Synthetic Biology.

Statistics:

• The efficiency of the strand displacement was lower in complex nanostructures (reduced to 50% compared to simple DNA duplexes).
• Increasing the number of mismatches increased the efficiency of the PX-JX conversion by 30% (from 60% to 90%).
• The statistical analysis showed a significant difference in efficiency between simple DNA duplexes and complex nanostructures (p-value < 0.05).
• The device conversion process was controlled by tuning the number of mismatches, with optimal conversion achieved at 5 mismatches.

Sources:

• Acs Synthetic Biology, 2025 - "Mismatch-Induced Toehold-Free Strand Displacement Used to Control a DNA Nanodevice"
• State University of New York (SUNY) Albany - RNA Institute, State University of New York (SUNY) Albany, State University of New York (SUNY), Albany, New York 12222, United States
• Acs Synthetic Biology - www.pubs.acs.org/journal/asbcd6
• American Chemical Society - www.acs.org
• Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA