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Duck circovirus genetic engineering subunit vaccine and preparation method and application thereof

A duck circovirus, amino acid technology, applied in genetic engineering, botanical equipment and methods, biochemical equipment and methods, etc., can solve problems such as superficial understanding and difficulty, achieve strong immunogenicity, high expression level, low The effect of production costs

Inactive Publication Date: 2019-09-17
苏州世诺生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the late discovery of DCV and the lack of methods for in vitro proliferation and culture of DCV, there are still many difficulties in the study of its pathogenic mechanism and harm, and the understanding is still very superficial.

Method used

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  • Duck circovirus genetic engineering subunit vaccine and preparation method and application thereof
  • Duck circovirus genetic engineering subunit vaccine and preparation method and application thereof
  • Duck circovirus genetic engineering subunit vaccine and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Example 1 Construction and Identification of Shuttle Vector pF-Cap

[0111] 1. Amplification and purification of DCV Cap protein gene The codon-optimized DCVCap protein gene (SEQ ID NO: 1) was synthesized in Nanjing GenScript Company and cloned into the pUC17 plasmid to obtain the pUC-Cap plasmid vector. Use the pUC-Cap plasmid as a template, and Cap-F and Cap-R as upstream and downstream primers for PCR amplification (the gene sequences of Cap-F and Cap-R are shown in SEQ ID NO: 3 and 4), and the amplification system is shown in the table 1.

[0112] Table 1 Cap protein gene amplification system

[0113]

[0114] The reaction conditions were: 95°C pre-denaturation for 5 minutes; 94°C denaturation for 45 seconds, 54°C annealing for 45 seconds, 72°C extension for 1 minute, 35 cycles; 72°C extension for 10 minutes.

[0115] Perform gel electrophoresis on the PCR product to verify the size of the target gene, such as figure 1 As shown, the target band appeared at the...

Embodiment 2

[0128] Embodiment 2 recombinant baculovirus genome Bac-Cap construction

[0129] 1. Transformation of DH10Bac bacteria Take 1 μl of the pF-Cap plasmid in Example 1 and add it to 100 μl of DH10Bac competent cells, mix well, put in an ice bath for 30 minutes, heat shock in a 42°C water bath for 90 seconds, and then ice for 2 minutes, add 900 μl of DH10Bac without Amp LB liquid medium, cultured at 37°C for 5 hours. After 100 μl of bacterial solution was diluted 81 times, 100 μl of diluted bacterial solution was spread on LB solid medium containing gentamicin, kanamycin, tetracycline, X-gal and IPTG, and cultured at 37°C for 48 hours.

[0130] 2. Select a single clone Use an inoculation needle to pick up large white colonies, then streak on LB solid medium containing gentamicin, kanamycin, tetracycline, X-gal and IPTG, and culture at 37°C for 48 hours. Then pick a single colony and inoculate it into LB liquid medium containing gentamicin, kanamycin and tetracycline for culture, p...

Embodiment 3

[0131] Example 3 Recombinant Baculovirus Transfection

[0132] Inoculate 0.8×10 per well in a six-well plate 6 Sf9 cells, the cell confluence is 50-70%. Prepare the following complexes for each well: dilute 4 μl of Cellfectin transfection reagent with 100 μl of transfection medium T1, and briefly vortex; dilute 3 μg of the recombinant Bacmid-Cap plasmid in Example 2 with 100 μl of transfection medium T1, Prepare the transfection mixture by mixing the diluted transfection reagent and plasmid separately and blowing gently. Add the above-mentioned transfection complex after the cells adhere to the wall, incubate at 27°C for 5 hours, remove the supernatant, add 2ml of SF-SFM fresh medium, culture at 27°C for 4-5 days, and harvest the supernatant. The recombinant baculovirus rBac-Cap was obtained, and the virus titer of the harvested P1 generation recombinant baculovirus was detected by the MTT relative potency method, and the virus titer of the rBac-CapP1 seed virus was 3.4×10 ...

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Abstract

The invention provides a duck circovirus genetic engineering subunit vaccine and a preparation method and application thereof. A nucleic acid molecule of which the sequence is as shown in SEQID NO:1 or a nucleic acid molecule of which the nucleotide sequence is 95% or above same as that as shown in the SEQID NO:1 is used for coding duck circovirus outer capsid structural protein, an immune composition containing the duck circovirus outer capsid structural protein can be used for preparing the duck circovirus genetic engineering subunit vaccine, the antigenicity, the immunogenicity and the function of the vaccine are similar to those of natural protein, and the vaccine is high in expression level, high in immunogenicity and free from pathogenicity to ducks. The vaccine can be in large-scale serum-free suspension culture and preparation through a bioreactor, and the production cost of the vaccine can be greatly reduced.

Description

technical field [0001] The invention relates to a genetically engineered subunit vaccine, in particular to a duck circovirus genetically engineered subunit vaccine, which belongs to the technical field of animal immune medicines. Background technique [0002] Duck circovirus disease (DCVD) is an immunosuppressive disease caused by duck circovirus (Duck Circovirus, DCV) infection. All breeds and day-old ducks can be infected, and the clinical manifestations of the disease are poor feather development, shedding, emaciation, anemia, slow growth, and reduced feed conversion rate. [0003] Duck circovirus (DCV) belongs to the family Circoviridae (Circoviridae) Circovirus (Circovirus), virus particles are round or icosahedral symmetry, no envelope, diameter is about 15-16nm, is currently the smallest known duck virus. The virus has strong resistance to the external environment, and it is difficult for ducks to remove it once infected. Currently, it cannot be cultured in vitro. ...

Claims

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Application Information

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IPC IPC(8): A61K39/12A61K39/39A61P31/20C12N15/866C12N15/34C07K14/01
CPCA61K39/12A61K39/39A61K2039/552A61P31/20C07K14/005C12N15/86C12N2710/14143C12N2750/10034C12N2750/10051
Inventor 曹文龙孔迪滕小锘易小萍张大鹤
Owner 苏州世诺生物技术有限公司
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