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Clustered regularly interspaced short palindromic repeats (CRISPR) and associated protein (Cas) systems, since their discovery, have found growing applications in cell imaging, transcription modulation, therapeutics and diagnostics. Discovery of Cas12 and Cas13 have brought a new dimension to the field of disease diagnosis. These endonucleases have been extensively used for diagnosis of viral diseases in humans and animals and to a lesser extent in plants. The exigency of SARS-CoV-2 pandemic has highlighted the potential of CRISPR-Cas systems and sparked the development of innovative point-of-care diagnostic technologies. Rapid adaptation of CRISPR-chemistry combined with sensitive read-outs for emerging pathogens make them ideal candidates for detection and management of diseases in future. CRISPR-based approaches have been recruited for the challenging task of cancer detection and prognosis. It stands to reason that the field of CRISPR-Cas-based diagnosis is likely to expand with Cas12 and Cas13 playing a pivotal role. Here we focus exclusively on Cas12- and Cas13-based molecular diagnosis in humans, animals and plants including the detection of SARS-coronavirus. The CRISPR-based diagnosis of plant and animal diseases have not found adequate mention in previous reviews. We discuss various advancements, the potential shortfalls and challenges in the widespread adaptation of this technology for disease diagnosis.

The era of Cas12 and Cas13 CRISPR-based disease diagnosis