CRISPR-Cas technology has revolutionized molecular diagnostics by enabling the detection of single-nucleotide mutations. A novel photocontrolled one-pot assay combining recombinase polymerase amplification (RPA) with CRISPR-Cas12a was developed for the rapid identification of SARS-CoV-2 Omicron variants. This innovative system overcomes the limitations of traditional one-pot assays by using a photocleavable p-RNA to prevent premature Cas12a activation and target template cleavage. The assay, conducted at 39°C within 1 hour, exhibited a low limit of detection of 30 copies per reaction and successfully identified key mutations in the spike gene of Omicron variants, such as R346T, F486V, and 49X, differentiating sub-lineages BA.1, BA.5.2, and BF.7 with high sensitivity (97.3%) and specificity (100.0%).
By adapting photocontrolled CRISPR-Cas technology, a one-pot RPA/CRISPR-Cas12a assay was developed to offer rapid and user-friendly detection of SARS-CoV-2 Omicron variants. This approach not only streamlines the detection process but also minimizes contamination risks, making it particularly suitable for point-of-care testing in resource-limited settings. The study highlighted the clinical performance of the assay, emphasizing its potential as a versatile tool for detecting nucleic acid mutations beyond SARS-CoV-2 variants. The successful integration of isothermal amplification and CRISPR-Cas12a detection in a single-tube reaction underscores the assay’s promising application in molecular diagnostics.
Key Takeaways:
– The photocontrolled one-pot RPA/CRISPR-Cas12a assay enables rapid and sensitive detection of SARS-CoV-2 Omicron variants.
– By combining isothermal amplification with CRISPR technology, the assay offers a user-friendly and contamination-resistant detection method.
– The innovative approach shows high specificity and sensitivity in identifying key mutations in the spike gene of Omicron variants.
– The assay’s design allows for potential adaptation to detect various nucleic acid mutations, showcasing its versatility in molecular diagnostics.
Read more on pmc.ncbi.nlm.nih.gov