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

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Cell-Free Protein Synthesis-Based Biosensing Platforms for Clinical Diagnostics.

Xiaoyu Sun¹, Dan Zhang¹, Jie Liu¹

¹Department of Laboratory Medicine and Sichuan Provincial Key Laboratory for Human Disease Gene Study, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, No. 32, West Second Section First Ring Rd., Chengdu, Sichuan 610072, China.

|April 14, 2026

Summary

Cell-free protein synthesis (CFPS) offers rapid, versatile diagnostic sensing by eliminating cell cultures. This technology enables sensitive detection of various targets in portable formats, advancing point-of-care testing.

Keywords:

cell-free protein synthesis clinical diagnostics isothermal nucleic acid amplification microfluidic biosensing paper-based sensors point-of-care testing synthetic biology synthetic genetic circuits

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Area of Science:

Biotechnology
Molecular Biology
Diagnostics

Background:

Cell-free protein synthesis (CFPS) is an in vitro method for rapid protein production.
CFPS utilizes cell extracts, energy sources, and genetic templates, offering advantages like speed and programmability.
Its open reaction environment and lyophilization compatibility make it suitable for diverse applications.

Purpose of the Study:

To review the fundamental principles of CFPS.
To summarize major technological platforms for CFPS.
To highlight recent advances and future opportunities in diagnostic applications of CFPS.

Main Methods:

Integration of CFPS with modular genetic circuits.
Application of CRISPR-based detection and isothermal amplification.
Development of portable formats like paper-based devices and microfluidic chips.

Main Results:

CFPS platforms enable sensitive and specific detection of viral nucleic acids, pathogen antigens, and small molecules.
These systems support multiplexed and point-of-care testing, reducing time, cost, and infrastructure needs.
Recent engineering optimizations enhance CFPS performance and robustness.

Conclusions:

CFPS is a powerful tool for developing advanced diagnostic sensors.
Continued optimization addresses challenges in biosensor design, sensitivity, reproducibility, and clinical translation.
CFPS holds significant potential for future diagnostic and point-of-care applications.