Journal
ANALYTICAL CHEMISTRY
Volume 93, Issue 4, Pages 2038-2044Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c03708
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Funding
- National Natural Science Foundation of China (NSFC) [81630046]
- Natural Science Foundation of Guangdong Province, China [2020A1515010525]
- Science and Technology Program of Guangzhou [2019050001]
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Exploring the trans-cleavage ability of Cas13a and developing a specific and sensitive visual detection system for miRNA, called vCas, with a detection limit of 1 fM and single-base specificity, suggests a promising application in clinical molecular diagnosis.
The clustered regularly interspaced short palindromic repeats (CRISPR) and CRISPR-associated (Cas) (CRISPR/Cas) system innovates a next-generation biosensor due to its high-fidelity, programmability, and efficient signal amplification ability. Developing a CRISPR/Cas-based visual detection system could contribute to point-of-care biomarker diagnosis. Existing CRISPR/Cas9-mediated visual detection methods are limited by the inherent properties of Cas9. Herein, we explored the trans-cleavage ability of Cas13a on ribonucleotide-bearing DNA oligo, eliminated the unavailability of the trans-cleavage substrate for subsequent polymerization reaction, and developed a homogeneous CRISPR/Cas13a-based visual detection system (termed vCas) for specific and sensitive detection of miRNA. The results indicated that vCas can provide a detection limit of 1 fM for miR-10b with single-base specificity and can be used to analyze miRNA in serum and cell extracts. Conclusively, vCas holds a great application prospective for clinical molecular diagnosis.
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