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An Ultralocalized Cas13a Assay Enables Universal and Nucleic Acid Amplification-Free Single-Molecule RNA Diagnostics.
An Ultralocalized Cas13a Assay Enables Universal and Nucleic Acid Amplification-Free Single-Molecule RNA Diagnostics.
- Source :
-
ACS nano [ACS Nano] 2021 Jan 26; Vol. 15 (1), pp. 1167-1178. Date of Electronic Publication: 2020 Dec 17. - Publication Year :
- 2021
-
Abstract
- Existing methods for RNA diagnostics, such as reverse transcription PCR (RT-PCR), mainly rely on nucleic acid amplification (NAA) and RT processes, which are known to introduce substantial issues, including amplification bias, cross-contamination, and sample loss. To address these problems, we introduce a confinement effect-inspired Cas13a assay for single-molecule RNA diagnostics, eliminating the need for NAA and RT. This assay involves confining the RNA-triggered Cas13a catalysis system in cell-like-sized reactors to enhance local concentrations of target and reporter simultaneously, via droplet microfluidics. It achieves >10 000-fold enhancement in sensitivity when compared to the bulk Cas13a assay and enables absolute digital single-molecule RNA quantitation. We experimentally demonstrate its broad applicability for precisely counting microRNAs, 16S rRNAs, and SARS-CoV-2 RNA from synthetic sequences to clinical samples with excellent accuracy. Notably, this direct RNA diagnostic technology enables detecting a wide range of RNA molecules at the single-molecule level. Moreover, its simplicity, universality, and excellent quantification capability might render it to be a dominant rival to RT-qPCR.
- Subjects :
- Cell Line, Tumor
Enterococcus faecalis
Escherichia coli
Humans
Klebsiella pneumoniae
MCF-7 Cells
MicroRNAs analysis
Pseudomonas aeruginosa
RNA, Ribosomal, 16S analysis
Reverse Transcriptase Polymerase Chain Reaction
SARS-CoV-2 genetics
Staphylococcus aureus
CRISPR-Cas Systems
Microfluidics
RNA analysis
Subjects
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 15
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 33498106
- Full Text :
- https://doi.org/10.1021/acsnano.0c08165