Nanoamplicon Comparator for Live-Cell MicroRNA Imaging

Area of Science:

• Biotechnology
• Molecular Biology
• Nanotechnology

Background:

• Live-cell imaging demands high-quality probes for accurate data.
• Current probes struggle with simultaneous robustness, sensitivity, and consistency.
• Addressing these challenges is crucial for advancing cellular investigations.

Purpose of the Study:

• To introduce a novel probe-design strategy, the nanoamplicon comparator (NAC).
• To demonstrate the NAC's utility in intracellular microRNA (miRNA) imaging.
• To establish a single-assay system for robust, sensitive, and consistent miRNA detection.

Main Methods:

• Developed the nanoamplicon comparator (NAC) probe architecture.
• Integrated spherical nucleic acids (SNAs), catalytic hairpin assembly (CHA), and upconversion nanoparticles (UNPs).
• Utilized a catalytic circuit with UNP-hairpin-DNA and hairpin-DNA-organic-fluorophore conjugates for miRNA detection via LRET imaging.

Main Results:

• Successfully demonstrated proof-of-concept for NAC in intracellular miRNA imaging.
• Achieved quantitative imaging of miRNA expression levels using LRET against a UNP-emission reference.
• Showcased the ability to monitor miRNA levels in different cell lines and under external stimuli using miR21.

Conclusions:

• The NAC probe strategy offers a significant advancement for live-cell imaging applications.
• This novel design effectively addresses key challenges in probe robustness, sensitivity, and consistency.
• NAC enables reliable monitoring of miRNA expression, facilitating deeper insights into cellular processes.