Oishi M, Nakatani K. Dynamically Programmed Switchable DNA Hydrogels Based on a DNA Circuit Mechanism.
Small 2019;
15:e1900490. [PMID:
30859712 DOI:
10.1002/smll.201900490]
[Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 02/18/2019] [Indexed: 06/09/2023]
Abstract
Biological stimuli-responsive DNA hydrogels have attracted much attention in the field of medical engineering owing to their unique phase transitions from gel to sol through cleavage of DNA cross-linking points in response to specific biomolecular inputs. In this paper, a new class of biological stimuli-responsive DNA hydrogels with a dynamically programmed DNA system that relies on a DNA circuit system through cascading toehold-mediated DNA displacement reactions is constructed, allowing the catalytic cleavage of cross-linking points and main chains in response to an appropriate DNA input. The dynamically programmed DNA hydrogels exhibit a significant sharp phase transition from gel to sol in comparison to another DNA hydrogel showing noncatalytic cleavage of cross-linking points due to synchronization of the catalytic cleavage of cross-linking points and the main chains. Further, the sol-gel phase transitions of the DNA hydrogels in response to the DNA input are easily tunable by changing the cross-linking density. Additionally, with a structure-switching aptamer, DNA hydrogels encapsulating PEGylated gold nanoparticles can be used as enzyme-free signal amplifiers for the colorimetric detection of adenosine 5'-triphosphate (ATP); this detection system provides simplicity and higher sensitivity (limit of detection: 5.6 × 10-6 m at 30 min) compared to other DNA hydrogel-based ATP detection systems.
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