Evolution of CRISPR-cas detection systems: From nucleic acid recognition to omnidirectional point-of-care diagnostic...

Molecular diagnostic technologies play an indispensable role in modern medicine and public health. However, traditional diagnostic platforms frequently face an inherent trade-off between laboratory-grade analytical precision and the speed and operational simplicity required for point-of-care testing. In recent years, the emergence of the Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) and CRISPR-associated (Cas) protein system has precipitated disruptive technological changes to this field. CRISPR-Cas system possesses high-fidelity target recognition capability and exhibits a distinctive trans-cleavage activity upon activation, which functions as signal amplification. This technology alleviates the inherent trade-off between sensitivity and portability. This review systematically summarizes the core molecular mechanisms of CRISPR-Cas detection platforms, addressing the differences in substrate preference and cleavage behavior among mainstream effector proteins (e.g., Cas9, Cas12, Cas13, and Cas14) and prokaryotic Argonaute (pAgo) proteins. Furthermore,this review sorts out the technological iteration path of detection platforms and presents the applications of this technology in fields such as infectious disease surveillance, cancer liquid biopsy, preliminary screening of genetic diseases, food and environmental safety, and veterinary port quarantine. Despite the challenges in quantitative accuracy and anti-interference ability, CRISPR biosensors are powerfully driving precision medicine towards decentralized, on-site, and accessible Point-of-Care Testing (POCT).