Journal
BIOMATERIALS
Volume 274, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2021.120876
Keywords
CRISPR; Cas; Absolute quantification; Molecular diagnosis; Virus detection
Funding
- National Research Foundation, Prime Minister's Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme, through Singapore MIT Alliance for Research and Technology (SMART): Critical Analytics for Manufactur
- National Medical Research Council, Singapore [CIRG18-nov-0045]
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RADICA is a novel approach for absolute quantification of nucleic acids in 40-60 minutes, offering high accuracy and low variability in detecting and quantifying various targets such as SARS-CoV-2 and EBV. It provides a faster alternative to traditional methods, showing versatility and sensitivity across different applications.
Rapid diagnostics of adventitious agents in biopharmaceutical/cell manufacturing release testing and the fight against viral infection have become critical. Quantitative real-time PCR and CRISPR-based methods rapidly detect DNA/RNA in 1 h but suffer from inter-site variability. Absolute quantification of DNA/RNA by methods such as digital PCR reduce this variability but are currently too slow for wider application. Here, we report a RApid DIgital Crispr Approach (RADICA) for absolute quantification of nucleic acids in 40-60 min. Using SARSCoV-2 as a proof-of-concept target, RADICA allows for absolute quantification with a linear dynamic range of 0.6-2027 copies/mu L (R2 value > 0.99), high accuracy and low variability, no cross-reactivity to similar targets, and high tolerance to human background DNA. RADICA's versatility is validated against other targets such as Epstein-Barr virus (EBV) from human B cells and patients' serum. RADICA can accurately detect and absolutely quantify EBV DNA with similar dynamic range of 0.5-2100 copies/mu L (R2 value > 0.98) in 1 h without thermal cycling, providing a 4-fold faster alternative to digital PCR-based detection. RADICA therefore enables rapid and sensitive absolute quantification of nucleic acids which can be widely applied across clinical, research, and biomanufacturing areas.
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