CN102337358B - Primers and probe for detecting mouse Sendai virus and method thereof - Google Patents
Primers and probe for detecting mouse Sendai virus and method thereof Download PDFInfo
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Abstract
The invention discloses primers and a probe for detecting mouse Sendai virus and a method thereof. The primers have a pair of oligonucleotides constituted by an upstream primer with the SEQ ID No. 1 (sequence identity number 1) in a sequence table and a downstream primer with the SEQ ID No. 2 in the sequence table, and the probe matched with the primers has a nucleotide sequence of the SEQ ID No. 3 in the sequence table. By using the method and a kit for detecting the mouse Sendai virus, the advantages of rapidness, simplicity, high sensitivity, strong specificity and high recovery rate are realized, the defects of being complex and time-consuming in the existing detection means, being long in period and having certain requirements for an operation laboratory are overcome, and the application prospects are great.
Description
Technical field
The present invention relates to field of biological detection, particularly relate to a kind of primer for detection of little murine sendai virus, probe and method thereof.
Background technology
The virus of natural infection laboratory animal is a lot, according to the hazardness to the mankind, can be divided three classes; One class is zoonosis virus, can infect people and primate; Two classes there is no at present sign and show to infect people, but copy in the people that can cultivate in vitro, ape and monkey source sexual cell, to being potentially dangerous property of the mankind; Three viroids are infection animal itself only under field conditions (factors), there is no at present sign and shows to infect people, therefore the mankind is threatened not quite.
Now, mouse, as a main source of the biological products such as monoclonal antibody, protein medicaments, has potential virus and pollutes.In tri-of < < Pharmacopoeia of People's Republic of China (version in 2010) > >, stipulated that mouse biological products need 8 kinds of mouse source viruses of quality inspection, its small mouse Sendai virus belongs to a class, zoonosis virus, can infect people and primate, concerning human body, have very large danger.
Sendai virus (Sendai virus, SEV) belongs to Paramyxoviridae, paramyxovirus genus.Nineteen fifty-three finds in Japanese celestial platform first, and isolated the first strain virus Fushimi strain, and people conduct extensive research and report Sendai virus afterwards.
Sendai virus is sub-thread minus-stranded rna virus, and it is rounded mostly virus particle is, diameter 130～250nm.The nucleoprotein of the inner spiral shape symmetrical structure by diameter 18nm of virus forms, and is surrounded by lipoprotein cyst membrane outward, has the fibre of radial arrangement prominent on it, fine prominent long 8～15nm, wide 2～4nm.
The natural reservoir (of bird flu viruses) of little murine sendai virus is rodent.Sendai virus can condense and dissolve the red corpuscle of many animals, as the red corpuscle of mouse, cavy, people, chicken, rat, sheep, rabbit.
Mouse infection originally can have two kinds of phenotypes after being ill.Chronic type is more common in the mouse of young mouse to 42 age in days, is subclinical infection, and virus exists for a long time in mouse group, and it is popular to be region.The sick mouse of acute often shows clinical symptom, thick disorderly by hair, have difficulty in breathing, become thin etc.Pregnant mouse still birth rate improves, and Neonatal Mouse mortality ratio rises.Little murine sendai virus also can infect the mankind simultaneously, causes respiratory tract system disease.
For the quality of objective evaluation mouse biological products, guarantee that people ' s health will play a positive role, pharmacopeia has been formulated the standard that mouse source virus detects.Wherein the mouse source method for detecting virus of regulation has: test cell line, animal's antibody produce experiment and chicken embryo infection experiment.These methods detect the potentially contaminated of mouse source virus from biological effect angle, detection means complexity is time-consuming, and the cycle is long, and the laboratory of operation be there are certain requirements, the Quality Control means that should not produce as a kind of guidance of routine.
And it is high to develop at present very ripe Real-Time Fluorescent Quantitative PCR Technique (Real-time Fluorence Quantitative Polymerase Chain Reaction is called for short Real Time PCR) detection sensitivity, simple and convenient, and also very low to Laboratory Request.Real Time PCR releases in 1996 Nian You U.S. Applied biosystems companies, to add fluorophor in PCR reaction system, utilize the whole PCR process of fluorescent signal accumulation Real-Time Monitoring, each circulation is become " visible ", the method for finally by Ct value and typical curve, the initial concentration of the DNA in sample (or cDNA) being carried out to quantitative analysis.The method is since producing, and development is perfect, and particularly, along with the widespread use of Taqman fluorescent probe, up to the present this technology is very ripe.The PCR of Taqman fluorescent probe detects and refers to while carrying out pcr amplification, when adding pair of primers in reaction system, also add a specific fluorescent probe, this probe is an oligonucleotide, and two ends are a report fluorogene of mark and a cancellation fluorophor respectively.When probe is complete, the fluorescent signal that reporter gene is launched is quenched gene and absorbs, during amplification along with Taq enzyme runs into the probe of being combined with template in chain extension process, its 5 '-3 ' exonuclease activity is cut degraded by probe enzyme, report fluorophor is separated with cancellation fluorophor, thereby fluorescence detecting system can monitor fluorescent signal, template often copies once, just has a probe to be cut off the release of following a fluorescent signal.Because d/d fluorophor number and PCR product quantity are one-one relationships, so signal accumulation and PCR product Complete Synchronization.After whole reaction finishes, just can obtain an amplification curve, by the amplification curve of concentration known standard model, can obtain a typical curve, according to the amplification curve in this typical curve and sample, can carry out quantitative analysis to sample.
Real-Time Fluorescent Quantitative PCR Technique not only realized to DNA/RNA template quantitatively, and thering is sensitivity and the feature such as specificity is high, can realize multiple reaction, level of automation is high, pollution-free, real-time and accurate, this has been widely used in a plurality of fields such as immunoassay, bacterium, virus detection.Up to now, Real-Time Fluorescent Quantitative PCR Technique detects mouse Sendai virus aspect and yet there are no report, has undoubtedly very wide development space.
Summary of the invention
In order to solve the deficiency of existing mouse Sendai virus detection method, the invention provides primer, probe and method thereof that a kind of real-time fluorescence quantitative PCR detects little murine sendai virus, the method is simple and convenient, highly sensitive and detection time is short.
An object of the present invention is to provide a pair of primer for detection of little murine sendai virus.
Primer provided by the invention is a pair of oligonucleotide being comprised of the upstream primer with the SEQ ID NO:1 in sequence table and the downstream primer with the SEQ ID NO:2 in sequence table.
SEQ ID NO:1 in sequence table is by 21 based compositions; SEQ ID NO:2 in sequence table is by 19 based compositions.
The inventor has designed multipair PCR primer, through long-term a large amount of experiment, has filtered out the primer pair being comprised of above-mentioned upstream primer and downstream primer from numerous primer pairs.Its amplification segment size is 100bp.The little murine sendai virus of this primer pair has the conservative property of height, and does not have significant homology with mouse genome, uses this primer to carry out pcr amplification, can realize accurate qualitative and quantitative analysis.
Another object of the present invention is to provide a kind of probe for detection of little murine sendai virus, and described probe has the nucleotide sequence of the SEQ ID NO:3 in sequence table, and described probe 5 ' end is connected with fluorescence report group, and 3 ' end is connected with fluorescent quenching group.
In described probe, fluorescence report group can be selected from and include but not limited to any one in FAM, VIC, JOE, HEX be preferably FAM; Described fluorescent quenching group is selected from TAMRA or Eclipse, is preferably TAMRA.
SEQ ID NO:3 in described sequence table is by 25 based compositions.
A further object of the present invention is to provide a kind of method for detection of little murine sendai virus, and described method use is above-mentioned mentions that primer and probe carry out real-time fluorescence quantitative PCR detection.
Preferably, the reaction system of described real-time fluorescence quantitative PCR also comprises Sendai virus RT-PCR amplifing reagent, positive RNA standard substance, yeast tRNA diluent, negative quality control product, blank.
Preferably, the annealing temperature of described real-time fluorescence quantitative PCR is 60 ℃.
Preferably, the reaction conditions of described real-time fluorescence quantitative PCR is: 48 ℃, and 15min; 95 ℃, 10min; 95 ℃, 15sec, 60 ℃, 40sec, totally 40 circulations.
Preferably, described method also comprises the foundation of typical curve, method is: amplification is containing the pMD18-T carrier of the base homologous sequence shown in SEQ ID NO:4 in sequence table, obtain the DNA fragmentation of 100bp, the RNA that described in in-vitro transcription, DNA fragmentation purifying obtain is as positive RNA standard substance, by its ten times positive plasmid standards for quantitations that are diluted to different concns, the described positive plasmid standards for quantitation of usining carries out real-time fluorescence quantitative PCR detection as template, obtains the typical curve for detection of little murine sendai virus.
Another object of the present invention is to provide a kind of test kit for detection of little murine sendai virus, and described test kit is containing the above-mentioned primer probe of mentioning.
Preferably, the reaction system of described test kit also comprises Sendai virus RT-PCR amplifing reagent, positive RNA standard substance, yeast tRNA diluent, negative quality control product, blank.
Preferably, described RT-PCR amplifing reagent is 2 * Taqman PCR Mix, 40 * TaqmanRT-Enzyme MIX, also can directly use Taqman RNA-Ct 1-Step kit.
Preferably, described positive RNA standard substance obtain by following method: amplification is containing the pMD18-T carrier of the base homologous sequence shown in SEQ ID NO:4 in sequence table, obtain the DNA fragmentation of 100bp, to obtain RNA be standard substance for DNA fragmentation purifying described in in-vitro transcription.
Application when also object of the present invention is to provide the above-mentioned primer of mentioning or probe Sendai virus is residual in detecting mouse source biological products.
Compare with existing detection method, fluorescence quantifying PCR method provided by the invention detects little murine sendai virus and has the following advantages:
1, simple and quick: existing pharmacopeia mouse Sendai virus detection method is: test cell line, animal's antibody produce experiment and chicken embryo infection experiment, latent infection from biological effect angle detection of biological goods small mouse Sendai virus, take long (1～4 time-of-week), and the present invention detects Sendai virus from nucleic acid angle, from sample RNA, extract and start only to need about 6 hours to obtaining result, what wherein quantitative fluorescent PCR of the present invention was used is single stage method reaction system, operate more easy fast, only need the time of 1 hour 45 minutes.And the present invention is not high to operation laboratory environmental requirement, evade the issuable leak ，Ke of former sampling observation product enterprise and realized batch batch detection, further improved biological products Quality Control;
2, highly sensitive: existing detection method is the latent infection from biological effect angle detection of biological goods small mouse Sendai virus, wherein because of preparation, in preparation process, passed through the processing of a plurality of processing steps, the possibility that the live virus antigen of residual mouse source virus and antiviral antibody exist is minimum, and the present invention detects from viral nucleic acid angle, relatively aforementioned pharmacopeia prescriptive procedure, has improved the sensitivity detecting.While utilizing real-time fluorescence quantitative PCR in the present invention to detect in the biological products of mouse source Sendai virus, can accurate quantitative analysis, target RNA is 10
2～10
7in concentration range, there is good linear relationship, the highly sensitive 20copies/ μ l (100copies/reaction) that reaches;
3, repeatability, accuracy and specificity: the primer in the present invention and probe be according to the design of mouse SEV genome sequence, and with mouse genome without homology, detection specificity is strong, reproducible;
4, accuracy is higher: what the present invention used is RNA standard substance, more presses close to viral native state; Meanwhile, when detecting, standard substance and sample are all RNA, on extraction and amplification system, have consistence, have made up and have used DNA standard substance cannot weigh the defect of the detection efficiency in RT step, and accuracy is higher;
5, the rate of recovery is high: the present invention's from extraction step (and not being quantitative fluorescent PCR process) has weighed the feasibility of whole method.In industry, the universal standard requires the rate of recovery of detection method will reach more than 50%, and the real time fluorescence quantifying PCR method rate of recovery of the present invention has all reached more than 80%, is a kind of detection method of desirable alternative existing pharmacopeia regulation.
Accompanying drawing explanation
1, Fig. 1 is the quantitative curve of real-time fluorescence quantitative PCR;
2, Fig. 2 is real-time fluorescence quantitative PCR typical curve.
Embodiment
Following illustrated embodiment, only for explaining the present invention, is not intended to limit protection scope of the present invention.
Reagent raw material described in following embodiment, except indicating source especially, is commercially available common raw material, and the preparation of reagent adopts ordinary method.The method not describing in detail in embodiment is this area routine operation, refers to the < < molecular cloning > > third edition.
The design of embodiment 1 mouse Sendai virus primer special and probe
Sendai virus RNA is comprised of 15383 Nucleotide altogether, encode 6 virus structural proteins and a Nonstructural Protein, 6 structural protein are L (large), P (RNA polymerase), NP (nucleocapsid), HN (hemagglutinin-neuraminidase), F (Fusion) and M (membrane).A Nonstructural Protein C is viral distinctive albumen.Its sequence in the gene order is that 3 '-Leader-NP-P+C-M-F-HN-L-Leader-5 ', respectively has one section of leader sequence at 3 ' end and 5 ' end.
By the genome of different strain SEV in comparison GenBank, choose homologous sequence conservative in viral Nonstructural Protein: i.e. nucleotide sequence shown in SEQ ID NO:4.
For the conservative homologous sequence region design real-time fluorescence quantitative PCR of finding out, detect primer special and probe sequence, the object clip size amplifying is 100 bases.Wherein preferred primer, probe sequence are:
Upstream primer QSEV-100bp-F:5 '-GAAAGAGATGGCTACATTGTT-3 ', i.e. nucleotide sequence shown in SEQ ID NO:1;
Downstream primer QSEV-100bp-R:5 '-AAACACATAACTCGCGTCT-3 ', i.e. nucleotide sequence shown in SEQ ID NO:2;
Described probe QSEV-100bp-P:
5 '-AGTCTTGGTGTAATCCAGTCTGCTC-3 ', i.e. nucleotide sequence shown in SEQ ID NO:3;
Fluorescence report group FAM mark for 5 ' end of described probe, fluorescent quenching group TAMRA mark for 3 ' end.
With primer, the probe of design, carry out finding that it has high conservative type to little murine sendai virus after sequence analysis, with mouse genome/EST and other nearly edge virus homology not, its specificity is higher.
The preparation of the positive RNA standard substance of embodiment 2
First the pMD18-T carrier that preparation contains nucleotide sequence shown in homologous sequence SEQ ID NO:4, take it as increase the to obtain DNA fragmentation of 100bp of carrier, in-vitro transcription reaction is carried out in recovery, and reaction finishes rear DNA digestion template purifying RNA, quantitatively after as positive RNA standard substance.
1, the preparation of in-vitro transcription template
Nucleotide sequence shown in synthetic SEQ ID NO:4, and be inserted in pMD18-T carrier and be prepared from (by Invitrogen company, being synthesized), called after pMD18T-SEV.Take pMD18T-SEV as template, use upstream primer SEV-100bp-F: 5 '-TAATACGACTCACTATAGGGCATCTATG-3 ' and downstream primer SEV-100bp-R:5 '-TTTGCAAACACAATAC-3 ' to increase, amplify the DNA fragmentation of 100bp, after agarose gel electrophoresis reclaims, as the template of in-vitro transcription.
2, in-vitro transcription is prepared a large amount of RNA
In the EP of RNase free pipe, prepare reaction system, concrete configuration proportion is as follows:
37 ℃ are reacted 4 hours.
3, the removal of DNA in RNA standard substance
1) in above-mentioned reaction system, add 10 μ l DNaseI, 37 ℃ are continued reaction 30min;
2) add DEPC-H
2o 50 μ l/ phenol are imitated 100 μ l, and Vortex mixes, and 4 ℃ are centrifugal, 12000rpm, and 10min, shifts supernatant, and repeats this step once;
3) add 1/10 volume 3M NaAc (pH5.2) and 2.5 times of volume dehydrated alcohols ,-20 ℃, 30～60min;
4) 4 ℃ centrifugal, 12000rpm, 10min, removes supernatant.70% ethanol (RNase free) that adds 1ml precooling is washed once;
5), after precipitation is dried, be dissolved in the water of 100 μ l RNase free;
6) RNA of take after purifying is template, with primer SEV-100bp-F, SEV-100bp-R, carries out pcr amplification, and agarose gel electrophoresis detects, if DNA digestion is described completely without amplified band, if there is the amplified band need be from step 1) start repetition.
4, the quantitative separating of RNA
The SEV RNA standard substance total length 100nt of in-vitro transcription, molecular weight 4.08 * 10
4da, i.e. RNA=1.48 * 10 of 1 μ g purifying
14copies.After ultraviolet is quantitative, SEV RNA standard substance are diluted to 2 * 10 with the yeast tRNA of 20ng/ μ l
7copies/ μ l, is distributed into the every pipe of 30～40 μ l, and-80 ℃ frozen.
The foundation of embodiment 3 real-time fluorescence quantitative PCR amplification methods
1, real-time fluorescence quantitative PCR template preparation---total RNA extracts:
According to operation instruction, use respectively Trizol/Trizol LS test kit (Invitrogen company provides) to extract sample RNA, concrete grammar is as follows:
1) in sample (as needed to grind homogenate for tissue), add appropriate TRIzol//Trizol LS, mix the standing 5min of room temperature;
2) add chloroform: primary isoamyl alcohol (24: 1) solution 200 μ l, with vortex, acutely mix 10s, room temperature is placed 5min, 4 ℃ of centrifugal 15min of 15000prm;
3) get supernatant, add equal-volume isopropanol precipitating, 4 ℃ of centrifugal 15min of 15000prm;
4) remove supernatant, add 75% ethanol (volume ratio 1: 1) of precooling to wash RNA precipitation, 4 ℃ of centrifugal 10min of 15000prm;
5) remove supernatant, vacuum-drying, by 50 μ l RNase-free water dissolution precipitations;
6) add DNase I Digestive system, hatch 30min for 37 ℃;
7) add 300 μ l RNase-free water, add phenol: chloroform: primary isoamyl alcohol (25: 24: 1) solution 400 μ l, acutely mix 30s with vortex, 4 ℃ of centrifugal 4min of 15000prm;
8) water intaking phase, adds chloroform: primary isoamyl alcohol (24: 1) solution 400 μ l, and vortex acutely mixes 30s, 4 ℃ of centrifugal 4min of 15000prm;
9) add 3M sodium-acetate (pH5.2) 20 μ l, vortex mixes.The dehydrated alcohol 1000 μ l that add precooling, vortex mixes 10s, 4 ℃ of centrifugal 15min of 15000prm;
10) remove supernatant, add 75% ethanol 500 μ l of precooling, 4 ℃ of centrifugal 10min of 15000prm;
11) vacuum-drying, adds RNase-free water 100 μ l and dissolves, and-80 ℃ standby.
2, real-time fluorescence quantitative PCR reaction system
It is template that the inventor be take SEV RNA standard substance, various combination to probe, primer is groped, and has finally determined the best of breed of probe and primer: 10 μ M probe 0.5 μ l, each 0.5 μ l of 10 μ M real-time fluorescence quantitative PCR upstream and downstream primers in 20 μ l reaction systems.
Particularly, while carrying out sample determination, take total RNA as template, carry out real-time fluorescence quantitative PCR, wherein reaction system is:
Reaction system (20 μ l):
In above-mentioned reaction system, agents useful for same can, purchased from AB company, also can directly be used its test kit Taqman RNA to C
t1-step kit (cat#4392938).
3, real-time fluorescence quantitative PCR reaction conditions
With above-mentioned reaction system, carry out real-time fluorescence quantitative PCR, the annealing temperature in response procedures is groped, determine that optimum annealing temperature is 60 ℃.
Concrete reaction conditions is:
48 ℃, 15min; 95 ℃, 10min; 95 ℃, 15sec, 60 ℃, 40sec, totally 40 circulations.Image data after each loop ends, reaction finishes rear according to amplification curve result of determination.
Embodiment 4 methodology checkings
1, the foundation of typical curve and the sensitivity of real-time fluorescence quantitative PCR
The SEV RNA standard substance that embodiment 2 is standby are diluted to 10,10
2, 10
3, 10
4, 10
5, 10
6, 10
7copies/ μ l is template, according to the reaction system in embodiment 3 and reaction conditions, carry out real-time fluorescence quantitative PCR reaction, after each loop ends along with PCR system, measure light absorption value, just obtained take cycle number as X-coordinate, light absorption value is that the quantitative curve of ordinate zou and the logarithmic value of standard substance concentration of take are X-coordinate, the typical curve that Ct is ordinate zou.Wherein, the implication of Ct value is: the cycle number that the fluorescent signal in each reaction tubes experiences while arriving the thresholding of setting.
The detection lower bound of real-time fluorescence quantitative PCR of the present invention: the dilution lower bound that occurs credible Ct value in 40 circulations, when every, differ from 10 times of template amounts, Ct value differs 3.3 Ct value and is considered to believable Ct value, quantitative curve as shown in Figure 1 can draw, the sensitivity of this real-time fluorescence quantitative PCR can reach 100copies/ μ l.
Research shows, the logarithm of the Ct value of each template and the initial copy number of this template exists linear relationship, and initial copy number is more, and Ct value is less.Utilize the positive plasmid standards for quantitation of known initial copy number to make typical curve, wherein X-coordinate represents the logarithm of initial copy number, and ordinate zou is for Ct value.Therefore,, as long as obtain the Ct value of unknown sample, can calculate from typical curve the initial copy number of this sample.
Typical curve as shown in Figure 2, typical curve R
2=0.998, linear dependence is good.
2, the repeatability of real-time fluorescence quantitative PCR, accuracy and specificity
It is 10 that SEV RNA standard substance are diluted to respectively to concentration
6, 10
4, 10
2copies/ μ l, as high, medium and low value Quality Control, is negative quality control product with the negative contrast of anosis mouse RNA, with RNase-free H
2o is blank, carries out real-time fluorescence quantitative PCR, and measuring result is as following table 1:
Table 1
From the above results,
1) blank is set up, and experimental result is effective; Anosis mouse RNA detected result is negative;
Senior middle school's low value Quality Control detected result is positive, therefore illustrate that this detection method has very strong specificity;
2) 3 experimental standard deviations, in 15% left and right, illustrate that the present invention is reproducible, and precision meets the requirements;
3) accuracy meets the requirements.
3, rate of recovery experiment
Get 4 parts of mouse liver tissues (numbering 1～4) and 4 parts of commercially available Soviet Union peptides raw (numbering 4～8, the injection liquid after dissolving), SEV RNA standard substance are diluted to concentration 10
8, 10
6, 10
4copies/ μ l, according to the form below 2 proportioning preparation test samples (simulation positive).
The preparation of table 2 test sample
The extracting method of pressing in embodiment 3 extracts RNA, as the template of PCR reaction, then by the reaction system of embodiment 3 and condition, carries out real-time fluorescence quantitative PCR reaction, and wherein blank is with RNase-free H
2o is template, and three times reproducible results is as shown in table 3, calculates the rate of recovery of the method.
Table 3
From the above results,
Blank is set up, negative control no signal, and positive is all positive, and this experiment is set up, and this detection method rate of recovery is all more than 80%, than industry standard 50% height simultaneously.
The real-time fluorescence detection kit of embodiment 5 little murine sendai viruses
By above-mentioned for little murine sendai virus being carried out to the upstream and downstream primer probe mixed solution 500 μ l of real-time fluorescence quantitative PCR detection, 2 * Taqman RT-PCR Mix 10ml, 40 * Taqman RT-Enzyme MIX 0.5ml, positive RNA standard substance (1 * 10
7copies/ μ l) 50 μ l and yeast tRNA diluent 10ml, negative control product 25 μ l, RNase-free H
2o10ml packs jointly, obtains the real-time fluorescence detection kit of little murine sendai virus.
This test kit using method:
Using by the total RNA of the sample extracting in embodiment 3-1 as template, positive RNA standard substance 1 * 10
7copies/ μ l, as positive control template, is used negative control, RNase-free H simultaneously
2o blank, carries out real-time fluorescence quantitative PCR according to the reaction conditions of the reaction system of embodiment 3-2 and embodiment 3-3, simultaneously with reference to the method for embodiment 4-1, positive RNA standard substance dilution is carried out to real-time fluorescence quantitative PCR production standard curve for different concns.
Interpretation of result, when positive control, negative control, blank are all normal, as long as obtain the Ct value of unknown sample, can calculate from typical curve the initial copy number of this sample.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (14)
1. the combination of the probe being used in conjunction with for detection of the primer of little murine sendai virus with described primer, it is characterized in that, described primer is a pair of oligonucleotide that the downstream primer shown in the upstream primer shown in the SEQ ID NO:1 in sequence table and the SEQ ID NO:2 in sequence table forms; Described probe is the nucleotide sequence shown in the SEQ ID NO:3 in sequence table.
2. combination according to claim 1, is characterized in that, described probe 5 ' end is connected with fluorescence report group, and 3 ' end is connected with fluorescent quenching group.
3. combination according to claim 2, is characterized in that, described fluorescence report group is selected from any one in FAM, VIC, JOE, HEX, and described fluorescent quenching group is selected from TAMRA or Eclipse.
4. combination according to claim 2, is characterized in that, described fluorescence report group is FAM, and described fluorescent quenching group is TAMRA.
5. one kind for detection of the residual method of Sendai virus in the biological products of mouse source, it is characterized in that, described method right to use requires the primer for detection of little murine sendai virus described in any one in 1 to 4 and real-time fluorescence quantitative PCR detection is carried out in the combination of the probe that is used in conjunction with described primer.
6. method according to claim 5, is characterized in that, the reaction system of described real-time fluorescence quantitative PCR also comprises RT-PCR amplifing reagent, positive RNA standard substance, yeast tRNA diluent, negative quality control product, blank.
7. according to the method described in claim 5 or 6, it is characterized in that, the annealing temperature of described real-time fluorescence quantitative PCR is 60 ℃.
8. according to the method described in claim 5 or 6, it is characterized in that, the reaction conditions of described real-time fluorescence quantitative PCR is: 48 ℃, and 15min; 95 ℃, 10min; 95 ℃, 15sec, 60 ℃, 40sec, totally 40 circulations.
9. according to the method described in claim 5 or 6, it is characterized in that, described method also comprises the foundation of typical curve, method is: amplification is containing the pMD18-T carrier of the base homologous sequence shown in SEQ ID NO:4 in sequence table, obtain the DNA fragmentation of 100bp, the RNA that described in in-vitro transcription, DNA fragmentation purifying obtain is as positive RNA standard substance, by its ten times positive plasmid standards for quantitations that are diluted to different concns, the described positive plasmid standards for quantitation of usining carries out real-time fluorescence quantitative PCR detection as template, obtains detecting the typical curve of little murine sendai virus.
10. a test kit that detects little murine sendai virus, is characterized in that, described test kit contains the primer for detection of little murine sendai virus described in any one in claim 1 to 4 and the combination of the probe that is used in conjunction with described primer.
11. test kits according to claim 10, is characterized in that, the reaction system of described test kit also comprises RT-PCR amplifing reagent, positive RNA standard substance, yeast tRNA diluent, negative quality control product, blank.
12. test kits according to claim 11, is characterized in that, described RT-PCR amplifing reagent is 2 * Taqman PCR Mix, 40 * Taqman RT-Enzyme MIX.
13. according to the test kit described in claim 11 or 12, it is characterized in that, described positive RNA standard substance obtain by following method: amplification is containing the pMD18-T carrier of the base homologous sequence shown in SEQ ID NO:4 in sequence table, obtain the DNA fragmentation of 100bp, the RNA that DNA fragmentation purifying obtain described in in-vitro transcription is standard substance.
Being combined in of the primer for detection of little murine sendai virus in 14. claims 1 to 4 described in any one and the probe that is used in conjunction with described primer detected in the biological products of mouse source application when Sendai virus is residual.
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