Test kit for detecting nucleic acid of respiratory tract pathogens, detection method and application

A respiratory and reagent kit technology, applied in the biological field, can solve the problems of relying on large instruments and inconvenient detection

Active Publication Date: 2020-08-14
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of existing methods for detecting respiratory pathogens (such as new coronavirus (SARS-CoV-2), influenza A, influenza B) that rely on large instruments and inconvenient detection, etc., to provide A kit for detecting nucleic acids of respiratory pathogens, a detection method for nucleic acids of respiratory pathogens, crRNA, primer pairs and applications thereof

Method used

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  • Test kit for detecting nucleic acid of respiratory tract pathogens, detection method and application
  • Test kit for detecting nucleic acid of respiratory tract pathogens, detection method and application
  • Test kit for detecting nucleic acid of respiratory tract pathogens, detection method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0089] (1) Expression and purification of Cas12a protein

[0090] Lachnospiraceae bacterium The Cas12a (LbCas12a, amino acid sequence shown in SEQ ID NO: 57) gene derived from ND2006 was codon optimized (the optimized sequence is shown in SEQ ID NO: 102), and then ligated into the pET28a plasmid (Thermo Fisher Scientific, Massachusetts, USA ), protein expression is regulated by the T7 promoter. The C-terminus of LbCas12a contains a His6 tag for affinity purification, and a TEV restriction site is inserted between the Cas12a and His6 sequences. The resulting recombinant plasmid (hereinafter referred to as pET28a-LbCas12a) was transformed into Escherichia coli In BL21(DE3) cells. The next day, the monoclonal cells were inoculated into Luria-Bertani (LB) medium containing 50 μg / mL kanamycin, and cultured with shaking at 37°C. in OD 600 When it reached 0.8, 1 mM isopropyl-β-D-1-thiogalactopyranoside (IPTG) was added to induce protein expression and incubated at 37°C for 1...

Embodiment 2

[0129] The results obtained when testing different types of samples are as follows: Figure 20 Shown, detection method is the same as embodiment 1. It can be seen from the figure that the crRNA and primer pairs in Example 1 can be detected for different sample types (including sputum supernatant, nasal swab, throat swab, sputum, anal swab, feces, etc.), and its detection high specificity and sensitivity.

Embodiment 3

[0130] Example 3 For the detection of each pathogen in samples derived from living tissue and containing multiple pathogens

[0131] Adenovirus serotype 5 (Ad5) encoding ACE2 was transfected into BALB / c mice by intranasal (IN); 5 days later, the new coronavirus was transfected into mice by intranasal, 1 After 7 days, samples were collected for virus titer and nucleic acid detection (the detection method was the same as in Example 1). The result is as Figure 21 As shown, it can be seen from the figure that in addition to the detection of the new coronavirus (N and S genes), adenovirus can also be detected. It can be seen that the crRNA and primer pair in Example 1 can detect each pathogen in a sample containing multiple pathogens derived from living tissue.

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Abstract

The invention provides a test kit for detecting nucleic acid of respiratory tract pathogens. The kit comprises a CRISPR-Cas detection system: crRNA, a primer pair, Cas protein and a nucleic acid probethat are described in the invention. The invention further provides a detection method of the nucleic acid of the respiratory tract pathogens, a combination of the crRNA and the primer pair and application of the combination. The test kit and the detection method disclosed by the invention can be used for directly observing results by naked eyes without depending on a large instrument, and detection can be realized under a mild condition, so that the detection is more convenient; the test kit and the detection method provided by the invention can be used for efficiently and rapidly detecting/diagnosing the respiratory tract pathogens (such as flu A, flu B and COVID-19), have relatively high specificity and sensitivity, and can be used for detecting and screening the respiratory tract pathogens, for example, rapidly distinguishing various respiratory tract pathogens including the flu A, the flu B and the COVID-19.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to a kit, a detection method and an application for detecting nucleic acid of a respiratory pathogen. Background technique [0002] Cases of COVID-19 quickly appeared in countries around the world, and was declared a worldwide public health threat by the World Health Organization (WHO). Although the median onset time of COVID-19 is currently reported to be 4-5 days, a small proportion of infected patients develop symptoms after 14 days of isolation. The most common symptoms of COVID-19 are cough and fever. However, a certain proportion of patients do not show symptoms, including X-ray detection and CT detection. The uncertainty of the time of onset of symptoms of COVID-19 and the situation of asymptomatic infection have brought great obstacles to the early and accurate detection of the disease, thus making disease prevention and control extremely challenging. This makes t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12Q1/70C12Q1/6844C12N15/11
CPCC12Q1/6844C12Q1/701C12Q2600/16C12Q2521/107C12Q2531/119C12Q2521/327C12Q2537/143Y02A50/30
Inventor 刘佳
Owner SHANGHAI TECH UNIV
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