Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 31, Pages 9739-9743Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201804741
Keywords
in situ imaging; microRNA detection; MiR-21; programmed DNA assembly; strand displacement amplification
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Funding
- National Natural Science Foundation of China (NSFC) [21775024, 21275002]
- Recruitment Program of Global Young Experts (Thousand Talents Program)
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DNA is a highly programmable material that can be configured into unique high-order structures, such as DNA branched junctions containing multiple helical arms converging at a center. Herein we show that DNA programmability can deliver insitu growth of a 3-way junction-based DNA structure (denoted Y-shaped DNA) with the use of three hairpin-shaped DNA molecules as precursors, a specific microRNA target as a recyclable trigger, and a DNA polymerase as a driver. We demonstrate that the Y-shaped configuration comes with the benefit of restricted freedom of movement in confined cellular environment, which makes the approach ideally suited for insitu imaging of small RNA targets, such as microRNAs. Comparative analysis illustrates that the proposed imaging technique is superior to both the classic fluorescence insitu hybridization (FISH) method and an analogous amplified imaging method via programmed growth of a double-stranded DNA (rather than Y-shaped DNA) product.
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