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Availability: A Metric for Nucleic Acid Strand Displacement Systems.

Xiaoping Olson1, Shohei Kotani1, Jennifer E Padilla1

  • 1Micron School of Materials Science & Engineering, ‡Department of Chemistry & Biochemistry, and §Department of Electrical & Computer Engineering, Boise State University , 1910 University Drive, Boise, Idaho 83725, United States.

ACS Synthetic Biology
|February 16, 2016
PubMed
Summary

Researchers developed a new method to reduce leakage in DNA strand displacement systems by analyzing secondary structures. This approach significantly improves network stability and offers a rational design process for synthetic biology applications.

Keywords:
DNAavailabilityfrayingleakagemutual availabilitynucleic acidsreaction networksstrand displacement

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Area of Science:

  • Synthetic Biology
  • DNA Nanotechnology
  • Biophysics

Background:

  • DNA strand displacement systems are crucial for synthetic biology but suffer from leakage, limiting their stability and scalability.
  • Current methods to reduce leakage, like introducing mismatches, do not account for secondary structure nuances impacting reaction kinetics.

Purpose of the Study:

  • To quantify the impact of secondary structure on leakage in DNA strand displacement systems.
  • To introduce novel concepts for analyzing dynamic nucleic acid networks and improving system design.

Main Methods:

  • Introduced the concepts of 'availability' and 'mutual availability' to analyze secondary structure effects on leakage.
  • Quantified secondary structure of fuel strands and identified vulnerable substrate locations.
  • Applied these concepts to optimize DNA strand displacement systems.

Main Results:

  • Achieved a 4-fold reduction in leakage in DNA strand displacement systems.
  • Demonstrated the utility of availability and mutual availability for network analysis.
  • Identified specific substrate locations vulnerable to leakage.

Conclusions:

  • Secondary structure significantly impacts leakage kinetics in DNA strand displacement systems.
  • The developed concepts provide a rational design process for suppressing leakage.
  • This work offers new insights into dynamic nucleic acid networks for synthetic biology.