Affinity-Modulated Molecular Beacons on MoS₂ Nanosheets for MicroRNA Detection

Area of Science:

• Biomaterials Science
• Nanotechnology
• Molecular Diagnostics

Background:

• Layered two-dimensional transition-metal dichalcogenides, like MoS2, are increasingly used in biosensor development.
• DNA-functionalized nanomaterials offer unique properties for biomolecule detection.

Purpose of the Study:

• To develop a sensitive and specific biosensor for microRNA detection.
• To utilize diblock molecular beacons anchored on MoS2 nanosheets for enhanced detection.

Main Methods:

• Anchoring poly-cytosine (polyC) tailed diblock molecular beacons onto MoS2 nanosheets.
• Utilizing duplex-specific nuclease for signal amplification via target recycling.
• Modulating probe density by adjusting polyC tail length.

Main Results:

• Achieved ultrahigh sensitivity with a limit of detection of approximately 3.4 fM.
• Demonstrated high specificity for single nucleotide mismatch detection.
• Showcased selectivity in detecting target microRNA from complex serum samples with low background signal.

Conclusions:

• PolyC-mediated molecular beacons on MoS2 provide a robust platform for microRNA detection.
• The platform exhibits excellent sensitivity, specificity, and selectivity for clinical applications.
• This technology holds significant potential for quantitative microRNA analysis in diagnostics and research.