Gold-decorated magnetic nanoparticles modified with hairpin-shaped DNA for fluorometric discrimination of single-base mismatch DNA
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The authors describe the use of gold-decorated magnetic nanoparticles (Au/MNPs) in discriminating DNA sequences with a single-base (guanine) mismatch. The Au/MNPs were characterized through dynamic light scattering, X-ray diffraction, superconducting quantum interference device, and UV/visible spectroscopy. They were then conjugated to a probe oligomer consisting of a hairpin-shaped DNA sequence carrying two signalling fluorophores: fluorescein at its 3′ end and pyrene in the loop region. When interacting with the target DNA sequences, the hybridized probe–target duplex renders the pyrene signal (at excitation/emission wavelengths of 345/375 nm) either quenched or unquenched. Quenching (or nonquenching) of the pyrene fluorescence depends on the presence of a guanine (or a nonguanine) nucleotide at the designated polymorphic site. The linear range of hybridization in these Au/MNPs is from 0.1 nM to 1.0 μM of ssDNA. Conceivably, this system may serve as a single-nucleotide polymorphism probe.
KeywordsGold-decorated magnetic nanoparticles DNA sequences Single-base mismatch
The authors thank the Ministry of Science and Technology, Taiwan (grant nos. MOST 106-2314-B-390-001-MY2, MOST 104-2113-M-002-019-MY2, and MOST 104-2113-M-390-003) and Armed Forces Zuoying General Hospital (grant no. ZBH 105-03) for their support.
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