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Issue 42, 2017
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Distance dependent photoacoustics revealed through DNA nanostructures

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Molecular rulers that rely on the Förster resonance energy transfer (FRET) mechanism are widely used to investigate dynamic molecular processes that occur on the nanometer scale. However, the capabilities of these fluorescence molecular rulers are fundamentally limited to shallow imaging depths by light scattering in biological samples. Photoacoustic tomography (PAT) has recently emerged as a high resolution modality for in vivo imaging, coupling optical excitation with ultrasound detection. In this paper, we report the capability of PAT to probe distance-dependent FRET at centimeter depths. Using DNA nanotechnology we created several nanostructures with precisely positioned fluorophore–quencher pairs over a range of nanoscale separation distances. PAT of the DNA nanostructures showed distance-dependent photoacoustic signal enhancement and demonstrated the ability of PAT to reveal the FRET process deep within tissue mimicking phantoms. Further, we experimentally validated these DNA nanostructures as a novel and biocompatible strategy to augment the intrinsic photoacoustic signal generation capabilities of small molecule fluorescent dyes.

Graphical abstract: Distance dependent photoacoustics revealed through DNA nanostructures

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Article information

21 Jul 2017
09 Oct 2017
First published
10 Oct 2017

Nanoscale, 2017,9, 16193-16199
Article type

Distance dependent photoacoustics revealed through DNA nanostructures

J. Joseph, K. N. Baumann, P. Koehler, T. J. Zuehlsdorff, D. J. Cole, J. Weber, S. E. Bohndiek and S. Hernández-Ainsa, Nanoscale, 2017, 9, 16193
DOI: 10.1039/C7NR05353C

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