Development and validation of a PCR-free nucleic acid testing method for RNA viruses based on linear molecular beacon probes.
J Nanobiotechnology
; 20(1): 269, 2022 Jun 11.
Article
in English
| MEDLINE | ID: covidwho-1993364
ABSTRACT
BACKGROUND:
RNA viruses periodically trigger pandemics of severe human diseases, frequently causing enormous economic losses. Here, a nucleic acid extraction-free and amplification-free RNA virus testing probe was proposed for the sensitive and simple detection of classical swine fever virus (CSFV) and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), based on a double-stranded molecular beacon method. This RNA virus probe contains two base sequences-a recognition strand that binds to the specific domain of CSFV N2 or SARS-CoV-2 N, with a fluorophore (FAM) labeled at the 5' end, and a complementary strand (CSFV-Probe B or SARS-CoV-2-Probe B), combined with a quencher (BHQ2) labeled at the 3' end.RESULTS:
Using linear molecular beacon probe technology, the detection limit of the RNA virus probe corresponding to CSFV and SARS-CoV-2 were as low as 0.28 nM and 0.24 nM, respectively. After CSFV E2 and SARS-CoV-2 N genes were transfected into corresponding host cells, the monitoring of RNA virus probes showed that fluorescence signals were dramatically enhanced in a concentration- and time-dependent manner. These results were supported by those of quantitative (qRT-PCR) and visualization (confocal microscopy) analyses. Furthermore, CSF-positive swine samples and simulated SARS-CoV-2 infected mouse samples were used to demonstrate their applicability for different distributions of viral nucleic acids in series tissues.CONCLUSIONS:
The proposed RNA virus probe could be used as a PCR-free, cost-effective, and rapid point-of-care (POC) diagnostic platform for target RNA virus detection, holding great potential for the convenient monitoring of different RNA viruses for early mass virus screening.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Nucleic Acids
/
COVID-19
/
Classical Swine Fever Virus
Type of study:
Diagnostic study
/
Prognostic study
Limits:
Animals
Language:
English
Journal:
J Nanobiotechnology
Year:
2022
Document Type:
Article
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