When Nanoworlds Collide: Implementing DNA Amplification, Nanoparticles, Molecules, and FRET into a Single MicroRNA Biosensor.
Jingyue XuXue QiuNiko HildebrandtPublished in: Nano letters (2021)
Isothermal nucleic acid amplification strategies have been combined with nanotechnology for advanced biosensing, material design, and biomedical applications. However, merging phenomena and materials of different nanoscales with the aim of exploiting all their benefits at once has remained a challenging endeavor. Here, we exemplify the various problems one can encounter when combining the nanodimensions of lanthanide complexes (∼2 nm), Förster resonance energy transfer (FRET, ∼5 nm), quantum dots (QDs, ∼20 nm), and rolling circle amplification (RCA, ∼250 nm) into a single microRNA biosensor and how these challenges can be overcome. Six different approaches, including simple FRET-RCA, enzyme-digesting FRET-RCA, and FRET-hyperbranched-RCA were investigated. We demonstrated specific miR-21 detection with 80 fM limit of detection and multiplexing capability with FRET from a Tb complex to different QDs. The detailed view on the various complex multi-nanodimensional assay systems elucidated the limited clinical translation of such sophisticated multicomponent nanobiosensors.
Keyphrases
- energy transfer
- nucleic acid
- quantum dots
- label free
- photodynamic therapy
- sensitive detection
- single molecule
- loop mediated isothermal amplification
- gold nanoparticles
- cell proliferation
- mycobacterium tuberculosis
- long non coding rna
- high throughput
- long noncoding rna
- single cell
- light emitting
- living cells
- high resolution
- circulating tumor cells
- walled carbon nanotubes