On-Particle Rolling Circle Amplification-Based Core-Satellite Magnetic Superstructures for MicroRNA Detection

Bo Tian, Zhen Qiu, Jing Ma, Marco Donolato, Mikkel Fougt Hansen, Peter Svedlindh, Mattias Strömberg*

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Benefiting from the specially tailored properties of the building blocks as well as of the scaffolds, DNA-assembled core-satellite superstructures have gained increasing interest in drug delivery, imaging, and biosensing. The load of satellites plays a vital role in core-satellite superstructures, and it determines the signal intensity in response to a biological/physical stimulation/actuation. Herein, for the first time, we utilize on-particle rolling circle amplification (RCA) to prepare rapidly responsive core-satellite magnetic superstructures with a high load of magnetic nanoparticle (MNP) satellites. Combined with duplex-specific nuclease-assisted target recycling, the proposed magnetic superstructures hold great promise in sensitive and rapid microRNA detection. The long single-stranded DNA produced by RCA serving as the scaffold of the core-satellite superstructure can be hydrolyzed by duplex-specific nuclease in the presence of target microRNA, resulting in a release of MNPs that can be quantified in an optomagnetic sensor. The proposed biosensor has a simple mix-separate-measure strategy. For let-7b detection, the proposed biosensor offers a wide linear detection range of approximately 5 orders of magnitude with a detection sensitivity of 1 fM. Moreover, it has the capability to discriminate single-nucleotide mismatches and to detect let-7b in cell extracts and serum, thus showing considerable potential for clinical applications.
    Original languageEnglish
    JournalA C S Applied Materials and Interfaces
    Issue number3
    Pages (from-to)2957-2964
    Publication statusPublished - 2018


    • Core−satellite superstructures
    • Magnetic nanoparticles
    • MicroRNA detection
    • On-particle rolling circle amplification
    • Optomagnetic biosensor

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