Volume 61, Issue 31 e202204252
Research Article

A DNA Barcode-Based Aptasensor Enables Rapid Testing of Porcine Epidemic Diarrhea Viruses in Swine Saliva Using Electrochemical Readout

Amanda Victorious

Amanda Victorious

School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1 Canada

These authors contributed equally to this work.

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Dr. Zijie Zhang

Dr. Zijie Zhang

Department of Biochemistry and Biomedical Sciences, McMaster University, Canada

These authors contributed equally to this work.

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Dr. Dingran Chang

Dr. Dingran Chang

Department of Biochemistry and Biomedical Sciences, McMaster University, Canada

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Roderick Maclachlan

Roderick Maclachlan

Department of Engineering Physics, McMaster University, Canada

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Dr. Richa Pandey

Dr. Richa Pandey

School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1 Canada

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Jianrun Xia

Jianrun Xia

Department of Biochemistry and Biomedical Sciences, McMaster University, Canada

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Jimmy Gu

Jimmy Gu

Department of Biochemistry and Biomedical Sciences, McMaster University, Canada

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Prof. Dr. Todd Hoare

Prof. Dr. Todd Hoare

School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1 Canada

Department of Chemical Engineering, McMaster University, Canada

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Prof. Dr. Leyla Soleymani

Corresponding Author

Prof. Dr. Leyla Soleymani

School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1 Canada

Department of Engineering Physics, McMaster University, Canada

Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Canada

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Prof. Dr. Yingfu Li

Corresponding Author

Prof. Dr. Yingfu Li

School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1 Canada

Department of Biochemistry and Biomedical Sciences, McMaster University, Canada

Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Canada

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First published: 13 May 2022
Citations: 29

Graphical Abstract

A rapid, simple, and reagent-less dual-electrode electrochemical chip (DEE-Chip) was developed using a barcode-releasing electroactive aptamer for on-farm detection of porcine epidemic diarrhea viruses (PEDv). This biosensor demonstrated a diagnostic sensitivity of 83 % and specificity of 100 % using 12 porcine saliva samples with a concordance value of 92 % at an analysis time of one hour.

Abstract

Pen-side testing of farm animals for infectious diseases is critical for preventing transmission in herds and providing timely intervention. However, most existing pathogen tests have to be conducted in centralized labs with sample-to-result times of 2–4 days. Herein we introduce a test that uses a dual-electrode electrochemical chip (DEE-Chip) and a barcode-releasing electroactive aptamer for rapid on-farm detection of porcine epidemic diarrhea viruses (PEDv). The sensor exploits inter-electrode spacing reduction and active field mediated transport to accelerate barcode movement from electroactive aptamers to the detection electrode, thus expediting assay operation. The test yielded a clinically relevant limit-of-detection of 6 nM (0.37 μg mL−1) in saliva-spiked PEDv samples. Clinical evaluation of this biosensor with 12 porcine saliva samples demonstrated a diagnostic sensitivity of 83 % and specificity of 100 % with a concordance value of 92 % at an analysis time of one hour.

Conflict of interest

The authors declare no conflict of interest.

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