Microfluidic detection based on size-encoded microbeads and rolling circle amplification for multiplex respiratory...

Area of Science:

• Biotechnology
• Molecular Diagnostics
• Medical Devices

Background:

• Acute respiratory diseases (ARDs) often involve multiple viral co-infections, complicating diagnosis and increasing mortality.
• Current diagnostic methods typically detect only one virus at a time, leading to missed diagnoses.

Purpose of the Study:

• To develop a sensitive, user-friendly method for simultaneous detection of multiple respiratory viral nucleic acids.
• To overcome limitations of single-target detection assays for ARDs.

Main Methods:

• Developed a novel assay utilizing size-encoded microbeads and rolling circle amplification (RCA).
• Designed a microfluidic chip with spacer arrays for size-based microbead separation and signal generation.
• Achieved high sensitivity with RCA, reaching a detection limit of fmol L^-1.

Main Results:

• The method achieved 100% sensitivity and specificity in detecting target viral RNA in clinical samples.
• Enabled simultaneous and in situ sensitive analysis of four viral nucleic acids.
• Demonstrated potential for enhanced throughput with additional microbead sizes and chip designs.

Conclusions:

• The developed strategy offers a promising solution for accurate clinical diagnosis of multiple respiratory viral infections.
• This multiplex detection method addresses the need for improved diagnostics in cases of co-infections.