Journal
NATURE NANOTECHNOLOGY
Volume 17, Issue 9, Pages 984-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41565-022-01175-4
Keywords
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Funding
- NIH Rapid Acceleration of Diagnostics (RADx) Tech program
- National Heart, Lung and Blood Institute
- National Institute of Biomedical Imaging and Bioengineering
- National Institutes of Health, Department of Health and Human Services [U54HL143541]
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This study proposes a strategy using plasmonic polymerase chain reaction for multiplexed fluorescence detection of SARS-CoV-2 RNA in human samples, showing potential as a point-of-care approach. The use of small optical components enables rapid and accurate molecular clinical diagnostics in decentralized settings.
Quantitative polymerase chain reaction allows the real-time detection of nucleic acids in human samples, representing a gold standard for infection detection, but it cannot be easily converted into a point-of-care approach. Here a strategy is proposed to leverage plasmonic polymerase chain reaction to achieve multiplexed, fluorescence detection of SARS-CoV-2 RNA from human saliva and nasal specimen, showing promise as a point-of-care approach. Quantitative polymerase chain reaction (qPCR) offers the capabilities of real-time monitoring of amplified products, fast detection, and quantitation of infectious units, but poses technical hurdles for point-of-care miniaturization compared with end-point polymerase chain reaction. Here we demonstrate plasmonic thermocycling, in which rapid heating of the solution is achieved via infrared excitation of nanoparticles, successfully performing reverse-transcriptase qPCR (RT-qPCR) in a reaction vessel containing polymerase chain reaction chemistry, fluorescent probes and plasmonic nanoparticles. The method could rapidly detect SARS-CoV-2 RNA from human saliva and nasal specimens with 100% sensitivity and 100% specificity, as well as two distinct SARS-CoV-2 variants. The use of small optical components for both thermocycling and multiplexed fluorescence monitoring renders the instrument amenable to point-of-care use. Overall, this study demonstrates that plasmonic nanoparticles with compact optics can be used to achieve real-time and multiplexed RT-qPCR on clinical specimens, towards the goal of rapid and accurate molecular clinical diagnostics in decentralized settings.
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