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Updated: Sep 6, 2025

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

Published on: June 17, 2022

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics.

Katariina Jaenes¹, Severino Jefferson Ribeiro da Silva², Justin R J Vigar¹

¹Leslie Dan Faculty of Pharmacy, University of Toronto.

Journal of Visualized Experiments : Jove

|July 5, 2022

Summary

Researchers developed a low-cost toehold switch diagnostic for Zika virus detection, offering performance comparable to RT-qPCR. This advancement enables accessible molecular diagnostics in resource-limited settings.

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Last Updated: Sep 6, 2025

Design to Implementation Study for Development and Patient Validation of Paper-Based Toehold Switch Diagnostics

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Area of Science:

Molecular diagnostics
Isothermal amplification techniques
Biosensor development

Background:

The need for accessible, low-burden molecular diagnostics is critical for global health and economic stability.
Isothermal diagnostic modalities offer rapid, cost-effective solutions for molecular testing.
Toehold switch-based diagnostics represent a promising new approach in this field.

Purpose of the Study:

To provide a detailed protocol for developing toehold switch-based assays for Zika virus detection.
To demonstrate the feasibility of creating sensitive and specific molecular diagnostics for infectious diseases.
To offer a roadmap for researchers in developing low-cost sensors for various applications.

Main Methods:

Computational design of toehold switches using Zika virus genomic sequences and open-source software.
Assembly and empirical screening of sensors with synthetic RNA, followed by sensitivity optimization.
Validation of the diagnostic assay using patient samples and comparison with reverse transcription-quantitative polymerase chain reaction (RT-qPCR).

Main Results:

Developed toehold switch-based diagnostics for Zika virus with performance comparable to RT-qPCR assays.
Demonstrated the potential for inexpensive development and manufacturing of these diagnostic tools.
Validated the assay using patient samples and a purpose-built optical reader (PLUM).

Conclusions:

Toehold switch-based diagnostics offer a viable, low-cost solution for rapid molecular testing.
The developed protocol provides a technical roadmap for creating similar sensors for human health, agriculture, and environmental monitoring.
This technology has the potential to significantly expand diagnostic capacity in low-resource environments.