CN107236824A - A kind of fluorescent quantitation RT PCR kits and application for porcine reproductive and respiratory syndrome virus specific detection - Google Patents

A kind of fluorescent quantitation RT PCR kits and application for porcine reproductive and respiratory syndrome virus specific detection Download PDF

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CN107236824A
CN107236824A CN201710516979.1A CN201710516979A CN107236824A CN 107236824 A CN107236824 A CN 107236824A CN 201710516979 A CN201710516979 A CN 201710516979A CN 107236824 A CN107236824 A CN 107236824A
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respiratory syndrome
porcine reproductive
syndrome virus
probe
pcr
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李晓菲
秦立廷
陈婷
魏笑笑
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New Hope Liuhe Co Ltd
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Abstract

The invention provides a kind of fluorescent quantitation RT PCR kits for porcine reproductive and respiratory syndrome virus specific detection and application, belong to kit technical field, the kit includes following components:The specific primer pair and probe of reaction mixture, water and specific amplification porcine reproductive and respiratory syndrome virus ORF6 genes.The present invention has good linear relationship in the range of the templates of 101~108copies μ L 1, and sensitivity reaches 101copies μ L 1;This method can in real time be monitored to its result;This method has good specificity;Rapidly and accurately PRRSV can be detected in 2 3h, qualitative detection, and energy accurate quantitative analysis can be carried out, and classical strainses, highly pathogenic mutant strain and NADC30 like strains can be detected simultaneously.

Description

A kind of fluorescent quantitation for porcine reproductive and respiratory syndrome virus specific detection RT-PCR kit and application
Technical field
It is used for pig breeding the present invention relates to a kind of fluorescence quantitative RT-PCR detecting kit, more particularly to one kind and breathes comprehensive The primer pair of simulator sickness virus-specific detection and probe, fluorescence quantitative RT-PCR kit and application.
Background technology
Porcine reproductive and respiratory syndrome(Porcine reproductive and respiratory syndrome, PRRS)It is by porcine reproductive and respiratory syndrome virus(PRRSV)The highly contagious disease of a caused boar.It is sent out with sow The respiratory symptom and high mortality of the breeding difficulty such as heat, apocleisis and miscarriage, stillbirth, the weak son of production and piglet are characterized.1987 Year, the disease was found in the U.S. first, then broke out and be popular in almost all of pig-raising countries, caused international extensive pass Note.China in 1996 reports first there is PRRS, hereafter spreads rapidly in China, and China's outburst in 2006 is high to be caused Sick PRRS epidemic situations, involve scope extensively, extremely heavy economic loss are caused to pig industry.Since the end of the year 2013, multiple provinces Part it is found that with U.S. NADC30 strains homology very high NADC30-like strains, the strain there is 131 in nsp2 areas in succession The discontinuous missing of individual amino acid.Epidemiological investigation shows that NADC30-like strains are in gradually in the multiple areas of China Epidemic status.PRRS has turned into one of main epidemic disease of harm China pig industry.
Current PRRSV common detection methods include virus purification and identification, indirect immuno-fluorescence assay (IFA), Serum neutralization test (SN), reverse transcription-polymerase chain reaction (RT-PCR) and sequencing etc..These conventional methods are used for PRRSV detect when specificity, sensitiveness and it is ageing in terms of Shortcomings, particularly virus infection early diagnosis in body Now it is particularly evident.Standard PCR is combined by real-time fluorescence quantitative PCR with fluorescence probe detection technique, with high specificity, spirit Sensitivity is high, it is reproducible the advantages of, and easy to operate, the used time is short, and pollution is few, by analysis software can automatically quantitative analysis, As a result it is more accurate and visual, it is adaptable to the qualitative and quantitative detection of large batch of virus, it has been increasingly becoming the weight of pathogen detection Want method.
The content of the invention
It is fixed it is an object of the invention to provide a kind of fluorescence for porcine reproductive and respiratory syndrome virus specific detection Measure RT-PCR kit and application.
For achieving the above object, the present invention is realized by following measure:It is comprehensive with breathing that one kind is used for pig breeding The specific primer pair and probe of simulator sickness virus-specific detection, wherein, the nucleosides of two primers of specific primer centering Acid sequence difference is as follows:
Sense primer:5' CCATGGAAACCTGGAGATTCA 3'
Anti-sense primer:5' GCGGCCTAGCAAGCACAA 3';
The probe sequence is as follows:
5' FAM-CACCTCCAGATGCC-MGB 3'。
In addition, the invention provides the fluorescence quantitative RT-RCR for porcine reproductive and respiratory syndrome virus specific detection Kit, wherein, the kit includes following components:Reaction mixture, water and specific amplification porcine reproductive and respiratory syndrome The specific primer pair and probe of virus O RF6 genes;
The nucleotide sequence difference of described two primers of specific primer centering is as follows:
Sense primer:5' CCATGGAAACCTGGAGATTCA 3'
Anti-sense primer:5' GCGGCCTAGCAAGCACAA 3'
The probe sequence is as follows:
5' FAM-CACCTCCAGATGCC-MGB 3'。
Wherein, the reaction mixture is the Premix Ex Taq purchased from TaKaRa companies(Probe qPCR).
Wherein, the water is the RNase-free Water that water is available from TaKaRa companies.
In addition, the invention provides the described fluorescent quantitation for porcine reproductive and respiratory syndrome virus specific detection Application of the RT-PCR kit in porcine reproductive and respiratory syndrome virus detection reagent is prepared.
Wherein, this kit answering in PRRSV classical strainses, highly pathogenic mutant strain and NADC30-like strains With.
Beneficial effects of the present invention are:According in GenBank, porcine reproductive and respiratory syndrome virus(PRRSV)Sequence is set 1 pair of meter is directed to the primer and 1 specificity T aqMan-MGB probe of ORF6 genes, establishes a kind of quick detection PRRSV viruses The specificity T aqMan-MGB fluorescent quantitative RT-PCR methods of carrying capacity.Pass through the optimization to reaction condition and reaction system so that This method has good linear relationship in the range of 101~108copies μ L-1 templates, and sensitivity reaches 101copies μ L-1, is 100 times of RT-PCR method.And compared with conventional RT-PCR method, this method can in real time be supervised to its result Control, without further carrying out gel electrophoresis analysis.Experiment shows, this method and the viral no cross reaction of other swine diseases, with good Good specificity.Measuring samples are extracted after RNA reverse transcriptions, quantitative fluorescent PCR reaction is carried out, utilizes set up fluorescent quantitation RT-PCR method can rapidly and accurately be detected in 2-3h to PRRSV, can be carried out qualitative detection, can accurately be determined again Amount, and classical strainses, highly pathogenic mutant strain and NADC30-like strains can be detected simultaneously.
Brief description of the drawings
Fig. 1 is the PCR amplification figures of purpose gene.M:DL2000 Marker;1:PRRSV classical strainses;2:It is highly pathogenic to become Different strain;3:NADC30-like strains;4:Negative control.
Fig. 2 is the dynamic curve diagram of fluorescence quantitative RT-RCR.1-8 is respectively 108 ~ 101copies μ L-1 standard items
Fig. 3 is the canonical plotting of fluorescence quantitative RT-RCR.
Fig. 4 is the specific test figure of fluorescence quantitative RT-RCR.1:Standard items;2:Highly pathogenic mutant strain;3:It is classical Strain;4:NADC30-like strains;5-11 is respectively CSFV, PRV, PEDV, TGEV, PCV2, RV and negative control.
Fig. 5 is the sensitivity tests figure of conventional RT-PCR.M:DL2000 Marker;1-7:Dilution factor be 1.2 × 107 ~ 1.2 × 101copies μ L-1 template DNA;8:Negative control.
Fig. 6 is the replica test figure of fluorescence quantitative RT-RCR.
Embodiment
For the technical characterstic for illustrating this programme can be understood, below by embodiment, this programme is illustrated.
Embodiment 1 is used for the fluorescence quantitative RT-PCR kit of porcine reproductive and respiratory syndrome virus specific detection
The kit includes following components:Reaction mixture, water and specific amplification porcine reproductive and respiratory syndrome virus ORF6 The specific primer pair and probe of gene;
The nucleotide sequence difference of described two primers of specific primer centering is as follows:
Sense primer:5' CCATGGAAACCTGGAGATTCA 3'
Anti-sense primer:5' GCGGCCTAGCAAGCACAA 3'
The probe sequence is as follows:
5' FAM-CACCTCCAGATGCC-MGB 3'。
Wherein, the reaction mixture is the Premix Ex Taq purchased from TaKaRa companies(Probe qPCR).
Wherein, the water is the RNase-free Water that water is available from TaKaRa companies.
In addition, fixed present invention also offers the described fluorescence for porcine reproductive and respiratory syndrome virus specific detection Measure application of the RT-PCR kit in porcine reproductive and respiratory syndrome virus detection reagent is prepared.
Application of the kit of the present invention in detection porcine reproductive and respiratory syndrome virus
1 materials and methods
1.1 bacterial strains and strain
E.coli DH5 α are purchased from TaKaRa companies, PRRSV classical strainses VR2332(GenBank accession number AY150564.1)With CH1-α(GenBank accession number AY032626.1);Highly pathogenic strain HuN4(GenBank accession number EF635006.1)And NADC30-like strains are preserved by this laboratory.
1.2 instruments and reagent
CFX96 quantitative real time PCR Instruments are purchased from Bio-Rad companies, and ultraviolet specrophotometer is purchased from Thermo companies;Plasmid extraction is tried Agent box is purchased from AxyGen companies;Extraction reagent kit is purchased from invitrogen companies to DNA/RNA nucleic acid altogether;Premix Ex Taq (Probe qPCR)Purchased from TaKaRa companies;5 × All-In-One RT MasterMix are purchased from abm companies.
The design and synthesis of 1.3 probes
Prepared according to the method for embodiment 1.
Using MegAlign softwares to PRRSV the classical strainses VR2332 and CH-1a, highly pathogenic that are announced in GenBank The ORF6 gene orders of the strains such as variation strain's HuN4 and NADC30-like strain are compared analysis, in its conservative region Design specific primer and TaqMan-MGB fluorescence probes.Upstream primer sequence is Primer F: 5' CCATGGAAACCTGGAGATTCA 3', downstream primer sequence is Primer R: 5' GCGGCCTAGCAAGCACAA 3'.Visit Pin sequence is Probe: 5'FAM- CACCTCCAGATGCC-MGB 3'.The fluorescent reporter group of probe 5' ends mark is FAM, 3' ends mark fluorescent quenching group is Non-fluorescent quencher and Minor Groove Binder (MGB).
The extraction and cDNA synthesis of 1.4 viral RNAs
With DNA/RNA nucleic acid, extraction reagent kit extracts viscera tissue homogenate, viral cultures and blood respectively by its operational manual altogether Clear total serum IgE, is dissolved in the water that 20 μ L are free of RNase, for synthesizing cDNA.The μ L of total serum IgE 5.5 are taken to add 20 μ L reverse transcription systems In, wherein being free of RNase water comprising 4 μ L 5 × All-In-One RT MasterMix and 10.5 μ L, mix after 25 DEG C 10min, 42 DEG C of 30min, gained cDNA can be directly used for quantitative fluorescent PCR or put -20 DEG C saving backup.
The preparation of 1.5 plasmid standards
By primer of Primer F/R by standard PCR amplification PRRSV ORF6 target gene, the recovered kits of product PMD19-T carriers are connected afterwards, and conversion to E.coli DH5 α Escherichia coli is by sequencing acquisition positive colony plasmid Plasmid standard.Determine after DNA concentration, be converted into copy number, and be diluted to 1010copies μ L-1, -20 DEG C of preservations, before Dilution is used as plasmid standard.
The optimization of 1.6 quantitative fluorescent PCR reaction conditions
Using plasmid standard as template, Standard PCR reaction is carried out under different annealing temperature, amplified production passes through Ago-Gel Electrophoresis is analyzed, it is determined that optimal primer annealing temperature.Application matrix method is entered to the primer and probe concentration of quantitative fluorescent PCR Row optimization, to obtain optimal reaction system and reaction condition.
The foundation of 1.7 quantitative fluorescent PCR standard curves
It is 101-108copies μ L by 10 times of doubling dilutions of plasmid standard to concentration range-1.Each dilution factor sets 3 weights It is multiple, fluorescence quantitative PCR detection is carried out, standard curve is drawn.
1.8 specific test
Using the fluorescence quantifying PCR method of foundation to CSFV(CSFV), Pseudorabies virus(PRV), Porcine Epidemic Diarrhea Poison(PEDV), transmissible gastro-enteritis virus(TGEV), rotavirus(RV)And porcine circovirus 2 type(PCV2)Deng virus DNA is detected;Simultaneously using set up method to PRRSV classical strainses, highly pathogenic mutant strain and in recent years I Emerging NADC30-like strains carry out the specificity of detection checking this method in state swinery.
1.9 sensitivity tests
It is 10 every microlitre by 10 times of doubling dilutions to least concentration by positive DNA to copy, carries out quantitative fluorescent PCR reaction.Together When using the DNA as template, carry out Standard PCR reaction, upstream and downstream primer be respectively 5'CCAGCCAGTCAATCARCTGTG 3' and 5' GCGAATCAGRCGCACWGTATG 3'.The μ L of amplified production 10 are taken, are analyzed with 1.5% agarose gel electrophoresis, than Compared with the difference of the two sensitiveness.
1.10 replica test
Carry out the replica test in 4 batches between batch respectively with the standard items plasmid of 5 kinds of concentration and counted according to Ct values Calculate the coefficient of variation.
The detection of 1.11 pairs of clinical samples
By new hope six and dynamic guarantor's suspicious 120 parts of PRRSV clinical samples of central collection, fluorescence quantitative RT-RCR detection is carried out respectively With conventional RT-PCR detection, comparative analysis result.
2 results
The preparation of 2.1 plasmid standards
Pass through standard PCR amplification PRRSV ORF6 target gene by primer of Primer F/R(Fig. 1), the recovered reagent of product Box connects pMD19-T carriers after purification, and conversion to E.coli DH5 α Escherichia coli obtains positive colony matter by sequencing Grain is plasmid standard.Determine after DNA concentration, be converted into copy number, and be diluted to 1010copies μ L-1, -20 DEG C of guarantors Deposit, plasmid standard is used as with preceding dilution.
The optimization of 2.2 quantitative fluorescent PCR reaction conditions
By the optimization to annealing temperature and primer and concentration and probe concentration, the peak optimization reaction of fluorescence quantifying PCR method is finally determined Condition.Quantitative fluorescent PCR reaction system is altogether 25 μ L, containing 12.5 μ L 2 × Premix Ex Taq(Probe qPCR), 10 μ L Water, 0.5 μ L Probe(10μM), 0.5 μ L Primer F(10μM), 0.5 μ L Primer R(10μM), the μ L of plasmid standard 1. Reaction condition is: 95℃5min;95 DEG C of 15sec, 60 DEG C of 45sec, 40 circulations.
The foundation of 2.3 quantitative fluorescent PCR standard curves
It is 101-108copies μ L to take concentration-1Standard items plasmid carry out fluorescent quantitative PCR for template and set up mark Directrix curve.From Fig. 2 and Fig. 3, linear relationship is good, and standard curve is successfully established, available for clinical detection.
2.4 specific test
Testing result is equal to be detected to CSFV, PRV, PEDV, TGEV, RV and PCV2 with the fluorescence quantifying PCR method set up For feminine gender, these viral amplification curves are horizontal line, not up to detect threshold value, and PRRSV classical strainses, highly pathogenic Emerging NADC30-like strains have good amplification in variation strain and in recent years China swinery(Fig. 4), experiment knot Fruit shows that this method has good specificity.
2.5 sensitivity tests
The DNA profiling least concentration that fluorescence quantifying PCR method can be detected is 101copies μ L-1(Fig. 2), and Standard PCR energy The template least concentration of detection is 1.2 × 103copies μ L-1(Fig. 5), show set up fluorescent quantitative PCR detection method Sensitiveness be 100 times of conventional RT-PCR.
2.6 replica test
Carry out the replica test in batch between batch respectively with the standard items plasmid of 5 kinds of concentration.Test result indicates that, batch The coefficient of variation of the interior replica test between batch is respectively less than 2.5%(Table 1 and Fig. 6), show that this method has good repeatability With stability.
The PRRSV TaqMan-MGB quantitative fluorescent PCR replica test results of table 1
2.7 clinical sample testing results
To 120 parts of the suspicious PRRSV clinical samples of collection, fluorescence quantitative RT-RCR detection and conventional RT-PCR detection are carried out respectively (Table 2).Testing result to clinical sample shows, fluorescent quantitative RT-PCR method positive rate(59.2%)Than conventional RT- PCR method(46.7%)It is higher.In addition, there are 3 parts of sample Standard PCR testing results to be the positive in clinical sample detection process, and it is glimmering The quantitative testing result of light is feminine gender, finally determines that this 3 parts of samples are false positive with sequencing by rechecking, this shows that fluorescence is determined Amount method has higher specificity and sensitiveness, is more suitable for PRRSV clinical detection, especially infects early stage viral level When relatively low.
The clinical sample testing result of table 2
Technical characteristic of the invention without description can be realized by or using prior art, will not be repeated here, certainly, above-mentioned Illustrate it is not limitation of the present invention, the present invention is also not limited to the example above, those skilled in the art The variations, modifications, additions or substitutions made in the essential scope of the present invention, should also belong to protection scope of the present invention.

Claims (6)

1. specific primer pair and probe for porcine reproductive and respiratory syndrome virus specific detection, it is characterised in that institute The nucleotide sequence difference for stating two primers of specific primer centering is as follows:
Sense primer:5' CCATGGAAACCTGGAGATTCA 3'
Anti-sense primer:5' GCGGCCTAGCAAGCACAA 3';
The probe sequence is as follows:
5' FAM-CACCTCCAGATGCC-MGB 3'。
2. the fluorescence quantitative RT-PCR kit for porcine reproductive and respiratory syndrome virus specific detection, it is characterised in that The kit includes following components:Reaction mixture, water and specific amplification porcine reproductive and respiratory syndrome virus ORF6 genes Specific primer pair and probe;
The nucleotide sequence difference of described two primers of specific primer centering is as follows:
Sense primer:5' CCATGGAAACCTGGAGATTCA 3'
Anti-sense primer:5' GCGGCCTAGCAAGCACAA 3'
The probe sequence is as follows:
5' FAM-CACCTCCAGATGCC-MGB 3'。
3. fluorescence quantitative RT-PCR kit according to claim 2, it is characterised in that the reaction mixture be purchased from The Premix Ex Taq of TaKaRa companies(Probe qPCR).
4. fluorescence quantitative RT-PCR kit according to claim 2, it is characterised in that the water is available from for water The RNase-free Water of TaKaRa companies.
5. the fluorescence quantitative RT-RCR according to claim 2 for porcine reproductive and respiratory syndrome virus specific detection Application of the kit in porcine reproductive and respiratory syndrome virus detection reagent is prepared.
6. application according to claim 5, it is characterised in that this kit is in PRRSV classical strainses, highly pathogenic mutant The application of strain and NADC30-like strains.
CN201710516979.1A 2017-06-29 2017-06-29 A kind of fluorescent quantitation RT PCR kits and application for porcine reproductive and respiratory syndrome virus specific detection Pending CN107236824A (en)

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CN110453015A (en) * 2019-08-30 2019-11-15 苏州西山生物技术有限公司 PRRS virus real-time fluorescence quantitative PCR detection kit and primer
CN114107570A (en) * 2021-12-30 2022-03-01 青岛嘉智生物技术有限公司 TGEV fluorescent quantitative RT-PCR detection primer probe combination, kit and detection method
CN115820929A (en) * 2022-09-14 2023-03-21 温氏食品集团股份有限公司 Fluorescent quantitative PCR (polymerase chain reaction) detection kit for NADC34-like porcine reproductive and respiratory syndrome virus
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CN108611439A (en) * 2018-04-19 2018-10-02 河北农业大学 Kit for identifying and detecting porcine reproductive and respiratory syndrome virus and application thereof
CN110453015A (en) * 2019-08-30 2019-11-15 苏州西山生物技术有限公司 PRRS virus real-time fluorescence quantitative PCR detection kit and primer
CN114107570A (en) * 2021-12-30 2022-03-01 青岛嘉智生物技术有限公司 TGEV fluorescent quantitative RT-PCR detection primer probe combination, kit and detection method
CN115820929A (en) * 2022-09-14 2023-03-21 温氏食品集团股份有限公司 Fluorescent quantitative PCR (polymerase chain reaction) detection kit for NADC34-like porcine reproductive and respiratory syndrome virus
CN116064961A (en) * 2022-11-14 2023-05-05 盐城师范学院 Products and methods for fluorescent RT-RAA detection of genotype 2 porcine reproductive and respiratory syndrome virus
CN117844988A (en) * 2024-03-06 2024-04-09 赛锐思生物技术(吉林)有限公司 RT-qPCR detection primer and kit for porcine reproductive and respiratory syndrome virus and application of RT-qPCR detection primer and kit
CN117844988B (en) * 2024-03-06 2024-05-14 赛锐思生物技术(吉林)有限公司 RT-qPCR detection primer and kit for porcine reproductive and respiratory syndrome virus and application of RT-qPCR detection primer and kit

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Application publication date: 20171010