A Nuclease Protection ELISA Assay for Colorimetric and Electrochemical Detection of Nucleic Acids

Early and accurate diagnosis is crucial to monitor infection outcomes and provide timely interventions. However, gold standard polymerase chain reaction assays (PCR) are labor-intensive and require expensive reagents and instrumentation. Nuclease protection has been used for decades to detect and qu...

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Bibliographic Details
Published in:Analytical methods 2019-02, Vol.11 (8), p.1027-1034
Main Authors: Filer, Jessica E, Channon, Robert B, Henry, Charles S, Geiss, Brian J
Format: Article
Language:English
Subjects:
absorbance
Acids
antibodies
Assaying
Benzoquinone
Chemiluminescence
Colorimetry
detection limit
Diagnosis
Diagnostic software
Diagnostic systems
diagnostic techniques
Electrochemical analysis
Electrochemistry
Enzyme-linked immunosorbent assay
Horseradish peroxidase
Hydroquinone
Infectious diseases
Instrumentation
Nuclease
Nucleic acids
Organic chemistry
Peroxidase
point-of-care testing
Polymerase chain reaction
Quinones
Reagents
Substrates
Workflow
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Summary:Early and accurate diagnosis is crucial to monitor infection outcomes and provide timely interventions. However, gold standard polymerase chain reaction assays (PCR) are labor-intensive and require expensive reagents and instrumentation. Nuclease protection has been used for decades to detect and quantify nucleic acid but has not yet been investigated as a diagnostic tool for infectious disease. In this work, we describe a nuclease protection enzyme-linked immunosorbent assay (NP-ELISA) for accurate and sensitive detection of nucleic acid. Briefly, binding of a nucleic acid target to an oligo probe protects it from digestion of un-hybridized nucleic acid by S1 nuclease. Following the workflow of an ELISA, a horseradish peroxidase (HRP)-conjugated antibody binds the probe and oxidizes its substrate to generate signal. The assay was validated with three HRP substrates for absorbance, chemiluminescence, and electrochemical readouts, demonstrating great versatility. Electrochemical detection with 3,3',5,5'-Tetramethylbenzidine (TMB) gave the highest assay sensitivity with a limit of detection of 3.72×10 molecules mL . Furthermore, non-complementary targets did not generate a response, indicating a high degree of specificity. This proof of principle serves as a stepping stone towards developing miniaturized, multiplexed nuclease protection assays for point-of-care diagnosis.
ISSN:1759-9660
1759-9679
1759-9679
DOI:10.1039/C8AY02729C