CN113801960A - Kit for rapidly and specifically detecting influenza B virus and use method thereof - Google Patents

Kit for rapidly and specifically detecting influenza B virus and use method thereof Download PDF

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CN113801960A
CN113801960A CN202110498181.5A CN202110498181A CN113801960A CN 113801960 A CN113801960 A CN 113801960A CN 202110498181 A CN202110498181 A CN 202110498181A CN 113801960 A CN113801960 A CN 113801960A
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primer
sequence
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influenza
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刘清梅
白洁
齐希峰
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Flora Zhejiang Biotechnology Co ltd
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Abstract

The invention relates to a kit for rapidly and specifically detecting influenza B virus nucleic acid and a use method thereof, belonging to the technical field of biology. The kit comprises a working standard substance, a constant-temperature amplification reaction solution and a negative reference substance, wherein the working standard substance comprises a positive reference plasmid of a specific conserved sequence of the influenza B virus, and the specific conserved sequence is SEQ ID No. 1; the isothermal amplification reaction solution comprises 6 primers: primer F3 with the sequence of SEQ ID No. 2; primer B3 with the sequence of SEQ ID No. 3; the primer FIP with the sequence of SEQ ID No. 4; primer BIP with the sequence of SEQ ID No. 5; a primer LB, the sequence of which is SEQ ID No. 6; primer LF with the sequence of SEQ ID No. 7; the negative control is nucleic acid extract of nasopharyngeal swab of healthy person. The influenza B virus nucleic acid isothermal amplification detection kit provided by the invention has good consistency, high accuracy, quick operation and simple method.

Description

Kit for rapidly and specifically detecting influenza B virus and use method thereof
Technical Field
The invention relates to the technical field of molecular biology detection, in particular to a kit for quickly and specifically detecting influenza B virus nucleic acid and a using method thereof.
Background
Influenza virus belongs to the family of Orthomyxoviridae (Orthomyxoviridae), and has spherical particles with a diameter of 80nm to 120nm, is a single-stranded negative-strand RNA virus, has a genome of about 13.6kb, and consists of 8 independent fragments with different sizes. Influenza viruses are classified into types a, b, and c according to the difference between nucleoprotein and matrix protein. Influenza a viruses are susceptible to antigenic variation, which causes a worldwide pandemic for many times; influenza b virus is less pathogenic to humans; influenza c virus causes only non-obvious or mild upper respiratory tract infections in humans, rarely causing epidemics.
Due to high specificity and good sensitivity, molecular diagnostic techniques are widely used for the detection of influenza viruses, particularly in clinical laboratories. Since viral RNA is present in minute amounts in clinical samples. Therefore, in many molecular diagnostic assays, extraction, amplification and analysis of viral nucleic acids are often essential, and in the molecular detection process, the design of primers plays an important role in the specificity and sensitivity of detection. The Polymerase Chain Reaction (PCR) is a common method for molecular amplification, but the PCR has high requirements on hardware devices, expensive instruments and slow amplification speed, so loop-mediated isothermal amplification (LAMP) is currently available. The loop-mediated isothermal amplification technology is a novel nucleic acid amplification technology, has the characteristics of rapidness, simplicity and strong specificity, and can hopefully replace the traditional PCR method to detect microorganisms. Therefore, the invention provides a kit aiming at a section of specific gene sequence of the influenza B virus nucleic acid, and the kit can rapidly and specifically detect the influenza B virus.
Disclosure of Invention
The invention provides a kit for rapidly and specifically detecting influenza B virus nucleic acid and a using method thereof, which can rapidly and accurately detect the influenza B virus in samples such as nasopharyngeal swabs of patients in real time.
The technical scheme for solving the technical problems is as follows: a kit for rapidly and specifically detecting influenza B virus nucleic acid comprises a working standard substance, a constant-temperature amplification reaction solution and a negative reference substance,
the working standard comprises a positive control plasmid of a specific conserved sequence of the influenza B virus, and the specific conserved sequence is SEQ ID No. 1;
the isothermal amplification reaction solution comprises 6 primers: primer F3 with the sequence of SEQ ID No. 2; primer B3 with the sequence of SEQ ID No. 3; the primer FIP with the sequence of SEQ ID No. 4; primer BIP with the sequence of SEQ ID No. 5; a primer LB, the sequence of which is SEQ ID No. 6; primer LF with the sequence of SEQ ID No. 7;
the negative control substance is a nucleic acid extracting solution of a nasopharyngeal swab of a healthy person.
On the basis of the above technical solutions, the present invention may further specifically select as follows.
Specifically, the positive control plasmid is constructed by cloning a synthetic segment corresponding to a specific conserved sequence of an influenza B virus gene into a pGEM-T vector, and the concentration of the synthetic segment is 104copies/μL。
Specifically, the solvent of the isothermal amplification reaction solution is double distilled water, and the isothermal amplification reaction solution contains solutes with the following concentrations: bst DNA polymerase 8U/20. mu.L; 8mM MgSO4；2.4mM each dNTPs；20mM KCl；20mM(NH4)2SO4(ii) a 40Mm Tris-HCl; 0.2 wt% TritonX-100; 5pmol primer F3; 5pmol primer B3; 40pmol primer FIP; 40pmol primer BIP; 20pmol of primer LB; 20pmol of primer LB; 1.25 × EvaGreen fluorescent dye.
In addition, the invention also provides a method for using the kit for rapidly and specifically detecting the influenza B virus nucleic acid, which comprises the following steps:
s1, preparing total nucleic acid of a nasopharyngeal swab sample to be detected;
s2, taking three reaction tubes, adding 20 mu L of constant-temperature amplification reaction liquid into each reaction tube, then adding 5 mu L of to-be-detected sample into the first reaction tube, adding 5 mu L of working standard substance into the second reaction tube, adding 5 mu L of negative control substance into the third reaction tube, and then placing the three reaction tubes under a constant-temperature condition for amplification reaction;
and S3, measuring the fluorescence value in real time in the amplification reaction process, and determining whether the sample to be detected contains the influenza B virus or not according to the amplification curve after the reaction is finished.
Specifically, the reaction temperature of the amplification reaction was 65 ℃ and the reaction time was 30 min.
Compared with the prior art, the invention has the beneficial effects that:
a section of specific conserved sequence containing 700bp is screened out by comparing and analyzing the gene sequence of the influenza B virus, then 6 specific primers are designed aiming at the specific conserved sequence, the 6 specific primers, Bst DNA polymerase and EvaGreen fluorescent dye (the turbidity can bring errors for detection through naked eye observation, the detection sensitivity is not high, so the fluorescent dye is added), necessary inorganic salt and buffer solution form a constant-temperature amplification reaction solution, the nucleic acid of the influenza B virus can be rapidly amplified in the constant-temperature amplification reaction solution, and the rapid detection of the influenza B virus is realized through fluorescent real-time monitoring, so the method can be applied to the rapid detection of the influenza B virus in sputum or nasopharyngeal swab samples, and is convenient to operate and convenient and rapid to detect; when the kit is used, 5 mu L of total nucleic acid of a sample to be detected, 5 mu L of the working standard substance and 5 mu L of the negative reference substance are respectively added into three reaction tubes filled with 20 mu L of the constant-temperature amplification reaction solution, and the fluorescence values monitored in real time are compared in the amplification reaction process, so that the detection can be rapidly finished.
The kit provided by the invention has very good sensitivity and specificity: the kit is matched with fluorescence detection equipment, the lowest detection limit is 1000copies/mL, nucleic acid is extracted from common respiratory pathogenic bacteria including influenza A virus, streptococcus pneumoniae, haemophilus influenzae, mycoplasma pneumoniae, mycobacterium tuberculosis, staphylococcus aureus and the like and then is detected, only the influenza B virus has an amplification curve in a specificity test experiment, and other common pathogenic microorganisms have no amplification curve. The kit has the advantages of high speed, high sensitivity, simple operation, low cost and the like, and is suitable for quick detection, field detection and popularization and application in basic medical institutions.
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FIG. 1 is an amplification curve of a specificity test performed on a kit provided by the present invention;
FIG. 2 is the results of a sensitivity test performed on the kit provided by the present invention;
FIG. 3 is an amplification curve of a clinical sample experiment performed on the kit provided by the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail with reference to the drawings and the specific embodiments, which are only used for explaining the present invention and are not used for limiting the scope of the present invention.
A kit for rapidly and specifically detecting influenza B virus nucleic acid comprises a working standard substance, isothermal amplification reaction liquid and a negative reference substance, wherein the working standard substance comprises a positive reference plasmid of a specific conserved gene sequence of the influenza B virus, and the specific conserved sequence is SEQ ID No. 1; the isothermal amplification reaction solution comprises 6 primers: primer F3 with the sequence of SEQ ID No. 2; primer B3 with the sequence of SEQ ID No. 3; the primer FIP with the sequence of SEQ ID No. 4; primer BIP with the sequence of SEQ ID No. 5; a primer LB, the sequence of which is SEQ ID No. 6; primer LF with the sequence of SEQ ID No. 7; the negative control substance is a nucleic acid extracting solution of a nasopharyngeal swab of a healthy person.
1. The preparation method of the working standard product comprises the following specific steps:
(1) a700 bp conserved sequence (SEQ ID No.1) of influenza B virus gene is synthesized by a chemical synthesis method.
(2) And cloning the synthesized fragment into a pGEM-T vector to construct an influenza B virus positive control plasmid.
(3) The obtained positive control plasmid was transformed into E.coli DH 5. alpha. and mass-cultured in LB medium containing 1% ampicillin at 37 ℃ and then extracted with a high purity plasmid Large-Scale kit (DP116) from Tiangen Biochemical technology, Inc. (Beijing).
(4) Plasmid was purified and quantified, and diluted to 104And (5) copies/mL to obtain the working standard product.
2. The isothermal amplification reaction solution specifically consists of:
the solvent is double distilled water, and the solute therein is: 8U/20. mu.L Bst DNA polymerase (purchased from NEW ENGLAND BioLabs, cat # M0275), 8mM MgSO4、2.4mM each dNTPs、40mM Tris-HCl、20mM KCl、20mM(NH4)2SO40.2% TritonX-100, 5pmol primer F3; 5pmol primer B3; 40pmol primer FIP; 40pmol primer BIP; 20pmol of primer LB; 20pmol of primer LB; 1.25 × EvaGreen fluorescent dye (Biotium, cat # 31000).
3. The negative control product is a nucleic acid extracting solution of a nasopharyngeal swab of a healthy person, and the extracting method comprises the following steps:
A. 200 μ L of normal human nasopharyngeal swab stock solution was taken, and total nucleic acid was extracted according to the instructions of nasopharyngeal swab total nucleic acid extraction kit (DP318) of Tiangen Biochemical technology (Beijing) Ltd.
4. Preparation of nasopharyngeal swab sample to be tested
Extracting with nasopharyngeal swab sample of possible influenza B virus carrier, and making method of sample to be detected is the same as the above mentioned healthy person's nasopharyngeal swab nucleic acid extract.
5. Reaction system preparation and amplification reaction
At least three reaction tubes: adding 20 mu L of constant-temperature amplification reaction liquid and 5 mu L of nucleic acid of a sample to be detected into a first reaction tube; adding 20 mu L of constant temperature amplification reaction liquid and 5 mu L of working standard substance into a second reaction tube; mu.L of isothermal amplification reaction solution and 5. mu.L of negative control were added to the third reaction tube.
And (3) amplification reaction: and (3) reacting the reaction tube for 30min at 65 ℃, detecting a real-time test fluorescence value, and judging whether the sample to be detected carries the influenza B virus nucleic acid or not according to an amplification curve.
6. Detection of
A. Specificity test
The kit can be used for detecting common respiratory pathogenic bacteria such as influenza A virus, streptococcus pneumoniae, haemophilus influenzae, mycoplasma pneumoniae, mycobacterium tuberculosis, staphylococcus aureus and the like after extracting nucleic acid. The result is shown in figure 1, only influenza B virus has amplification curve in the specificity test experiment, and other common pathogenic bacteria have no amplification curve, which shows that the kit provided by the invention has better specificity.
B. Sensitivity test
To a concentration of 104Respectively measuring the dose of copies/mu l of influenza B virus standard (namely working standard) according to the ratio of 103、10210 and 1 copies/mu l gradient dilution, and then respectively used as total nucleic acid of a sample to be detected, and the kit is applied to detect the total nucleic acid. As shown in FIG. 2, it can be seen that the kit can detect at least 1 copy/. mu.l copy with high sensitivity.
C. Detection of clinical specimen of influenza B virus
5 samples of positive influenza B viruses identified by a certain Beijing hospital are collected, total nucleic acid is extracted according to the method for preparing the nasopharyngeal swab sample, and then the kit is used for detection. The results are shown in fig. 3, and 5 clinical cases were examined, wherein 5 cases were positive for influenza b virus, and the overall positive detection rate was 100%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Figure RE-ISB0000195458730000011
Figure RE-ISB0000195458730000021

Claims (6)

1. A kit for rapidly and specifically detecting influenza B virus nucleic acid is characterized by comprising a working standard substance, a constant-temperature amplification reaction solution and a negative control substance.
The working standard substance is a positive control plasmid comprising a specific conserved sequence of an influenza B virus gene, and the specific conserved sequence is SEQ ID No. 1;
the isothermal amplification reaction solution comprises 6 primers: primer F3 with the sequence of SEQ ID No. 2; primer B3 with the sequence of SEQ ID No. 3; the primer FIP with the sequence of SEQ ID No. 4; primer BIP with the sequence of SEQ ID No. 5; a primer LB, the sequence of which is SEQ ID No. 6; primer LF with the sequence of SEQ ID No. 7;
the negative control substance is a nucleic acid extracting solution of a nasopharyngeal swab of a healthy person.
2. The kit for rapidly and specifically detecting influenza B virus nucleic acid as claimed in claim 1, wherein the positive control plasmid is constructed by cloning a synthetic fragment corresponding to a specific conserved sequence into a pGEM-T vector, and the concentration of the synthetic fragment is 104copies/μL。
3. The kit for rapidly and specifically detecting influenza B virus nucleic acid according to claim 1, wherein the solvent of the isothermal amplification reaction solution is double distilled water, and the isothermal amplification reaction solution contains solutes with the following concentrations: bst DNA polymerase 8U/20. mu.L; 8mM MgSO4；2.4mM each dNTPs；20mM KCl；20mM(NH4)2SO4(ii) a 40Mm Tris-HCl; 0.2 wt% TritonX-100; 5pmol primer F3; 5pmol primer B3; 40pmol primer FIP; 40pmol primer BIP; 20pmol of primer LB; 20pmol of primer LB; 1.25 × EvaGreen fluorescent dye.
4. A method for using the kit for rapid and specific detection of influenza b virus nucleic acid according to any one of claims 1 to 3, comprising the steps of:
s1, extracting total nucleic acid from a nasopharyngeal swab sample to be detected;
s2, taking three reaction tubes, adding 20 mu L of constant-temperature amplification reaction liquid into each reaction tube, then adding 5 mu L of sample nucleic acid to be detected into the first reaction tube, adding 5 mu L of working standard substance into the second reaction tube, adding 5 mu L of negative control substance into the third reaction tube, and then placing the three reaction tubes into a constant-temperature amplification instrument for amplification reaction;
and S3, measuring the fluorescence values of the reaction liquid in the three reaction reverse tubes in real time in the amplification reaction process, and analyzing the result after the reaction is finished so as to determine whether the nasopharyngeal swab sample to be measured contains the influenza B virus.
5. The method of claim 4, wherein the amplification reaction is carried out at 65 ℃ for 30 min.
6. The method of claim 4, wherein the amplification reaction is followed by a melting curve test, which can be used to determine whether the product is relatively specific.
CN202110498181.5A 2021-05-08 2021-05-08 Kit for rapidly and specifically detecting influenza B virus and use method thereof Pending CN113801960A (en)

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