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Related Concept Videos

DNA Base Pairing02:27

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Preparation of DNA-crosslinked Polyacrylamide Hydrogels
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Dynamically Programmed Switchable DNA Hydrogels Based on a DNA Circuit Mechanism.

Motoi Oishi1, Kazuki Nakatani1

  • 1Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan.

Small (Weinheim an Der Bergstrasse, Germany)
|March 13, 2019
PubMed
Summary

New DNA hydrogels respond to biological triggers, offering tunable phase transitions. This advancement enables sensitive, enzyme-free detection of adenosine 5'-triphosphate (ATP) using DNA circuits and gold nanoparticles.

Keywords:
DNA circuitDNA hydrogelgold nanoparticlessol-gel phase transitiontoehold-mediated DNA displacement reaction

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Synthetic Biology

Background:

  • DNA hydrogels offer unique biomolecular-responsive phase transitions.
  • Stimuli-responsive hydrogels are crucial for advanced medical applications.

Purpose of the Study:

  • To construct novel biological stimuli-responsive DNA hydrogels using a dynamic DNA circuit system.
  • To investigate the tunable sol-gel phase transitions and their application in biosensing.

Main Methods:

  • Utilized cascading toehold-mediated DNA displacement reactions for catalytic cleavage.
  • Engineered DNA hydrogels with tunable cross-linking density.
  • Incorporated structure-switching aptamers and PEGylated gold nanoparticles for detection.

Main Results:

  • Achieved synchronized catalytic cleavage of cross-linking and main chains, leading to sharp gel-to-sol transitions.
  • Demonstrated tunable phase transitions by altering cross-linking density.
  • Developed an enzyme-free colorimetric detection system for adenosine 5 omino-triphosphate (ATP) with high sensitivity (LOD: 5.6 × 10-6 m).

Conclusions:

  • The developed DNA hydrogels exhibit enhanced responsiveness and tunable properties.
  • The system provides a sensitive and simplified platform for enzyme-free ATP detection.
  • This technology holds promise for advanced diagnostics and drug delivery systems.