期刊
ACS SYNTHETIC BIOLOGY
卷 6, 期 9, 页码 1774-1783出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssynbio.7b00105
关键词
molecular circuits; DNA strand displacement; nuclease; serum; degradation
资金
- DOE [221874, NSF-SHF-1527377]
- DOE
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [1527377] Funding Source: National Science Foundation
The functional stability and lifetimes of synthetic molecular circuits in biological environments are important for long-term, stable sensors or controllers of cell or tissue behavior. DNA based molecular circuits, in particular DNA strand-displacement circuits, provide simple and effective biocompatible control mechanisms and sensors, but are vulnerable to digestion by nucleases present in living tissues and serum-supplemented cell culture. The stability of double-stranded and single-stranded DNA circuit components in serum-supplemented cell medium and the corresponding effect of nuclease-mediated degradation on circuit performance were characterized to determine the major routes of degradation and DNA strand-displacement circuit failure. Simple circuit design choices, such as the use of S' toeholds within the DNA complexes used as reactants in the strand-displacement reactions and the termination of single-stranded components with DNA hairpin domains at the 3 ' termini, significantly increase the functional lifetime of the circuit components in the presence of nucleases. Simulations of multireaction circuits, guided by the experimentally measured operation of single-reaction circuits, enable predictive realization of multilayer and competitive-reaction circuit behavior. Together, these results provide a basic route to increased DNA circuit stability in cell culture environments.
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