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Issue 5, 2017
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Temporal control of i-motif switch lifetimes for autonomous operation of transient DNA nanostructures

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Abstract

Functional DNA nanotechnology creates increasingly complex behaviors useful for sensing, actuation or computation, as enabled via the integration of dynamic and responsive structural DNA motifs. However, temporally controlled and dynamic DNA structures with programmable lifetimes, that are able to operate autonomously and self-revert to the starting state are challenging to achieve due to tedious and very system-specific sequence design. Here, we present a straightforward concept to program transient lifetimes into DNA duplexes based on the pH-sensitive DNA i-motif switch. We integrate the i-motif switch with an internal, non-linear pH-resetting function using a rationally designed chemical reaction framework, by which the switch autonomously undergoes a complete “off–on–off”-cycle without the use of additional external triggers. The lifetime of the activated “on”-state (i.e. the hybridized state) can be systematically programmed over several hours. The system can be readily implemented into hybrid DNA structures on larger length scales. Focusing on autonomous materials, we demonstrate temporal control of transient fluorescence signals and temporary aggregation of gold nanoparticles.

Graphical abstract: Temporal control of i-motif switch lifetimes for autonomous operation of transient DNA nanostructures

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Publication details

The article was received on 10 Feb 2017, accepted on 28 Mar 2017 and first published on 31 Mar 2017


Article type: Edge Article
DOI: 10.1039/C7SC00646B
Citation: Chem. Sci., 2017,8, 4100-4107
  • Open access: Creative Commons BY license
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    Temporal control of i-motif switch lifetimes for autonomous operation of transient DNA nanostructures

    L. Heinen and A. Walther, Chem. Sci., 2017, 8, 4100
    DOI: 10.1039/C7SC00646B

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