Porcine pseudorabies virus gene deletion strain, vaccine composition, preparation method and application thereof

A technique for porcine pseudorabies virus and vaccine composition, applied in the field of animal virology

Active Publication Date: 2019-11-12
PULIKE BIOLOGICAL ENG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the pigs are immunized with vaccines in the prior art, they cannot completely resist the wild virus attack, and symptoms such as high fever, depression, loss of appetite or extinction will still occur, the infection rate exceeds 80%, the morbidity rate exceeds 30%, and the mortality rate is between 10%. Between 20%
For example, Peng Jinmei et al. Isolation and identification of new epidemic strains of porcine pseudorabies virus and analysis of antigenic differences. Chinese Journal of Preventive Veterinary Medicine, 2013, 35(1): 1-4; Tong Wu et al. Isolation of pseudorabies virus in infected piglets after immunization and Identification. Chinese Journal of Animal Infectious Diseases, 2013,21(3):1-7; Yu et al., Pathogenic Pseudorabies Virus, China, 2012.Emerging infectious Diseases.2014,20(1):102-104; An et al. al., Pseudorabies virus variant in Bartha-K61-vaccinated pigs, China, Emerging infectious Diseases.2013.19 (11): 1749-1755), there is no vaccine in the prior art to solve the pseudorabies caused by the pig pseudorabies variant

Method used

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  • Porcine pseudorabies virus gene deletion strain, vaccine composition, preparation method and application thereof
  • Porcine pseudorabies virus gene deletion strain, vaccine composition, preparation method and application thereof
  • Porcine pseudorabies virus gene deletion strain, vaccine composition, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1, the preparation of PRV HN1201 strain UL21 deletion strain

[0070] 1.1 Construction of PRV HN1201GFP recombinant virus transfer vector

[0071] According to the sequence of the UL21 gene to be deleted, design homology arms at its two ends, respectively UL21A and UL21B. UL21A and UL21B were cloned into pUC19 vector and named pUCUL21AB. Then the GFP gene was cloned into pUCUL21AB to obtain a recombinant virus transfer vector, which was named pUCUL21A-GFP-B. The homology arms in the transfer vector are the sequences on both sides of UL21, so the recombinant virus obtained after recombination is the deletion of the UL21 gene. The schematic diagram of recombinant transfer vector construction is shown in figure 1 , figure 2 is the location of the UL21A and UL21B homology arms on the genome.

[0072] 1.1.1. Amplification and cloning of homologous recombination arm

[0073] 1.1.1.1 Primer design and template preparation

[0074] According to the gene seque...

Embodiment 2

[0115] Embodiment 2, the preparation of PRV HN1201 strain TK / gE / gI / deletion strain

[0116] 1. Preparation of TK deletion strain

[0117] 1.1 Construction of GFP intermediate transfer vector required for deletion of PRV HN1201TK

[0118] According to the sequence of the TK gene to be deleted, design homology arms at its two ends, respectively TKA and TKB. TKA and TKB were cloned into pUC19 vector, named pUCTKAB. Then the GFP gene was cloned into pUCTKAB to obtain the recombinant virus transfer vector, which was named pUCTKA-GFP-B. The homologous arms in the transfer vector are sequences on both sides of TK, so the recombinant virus obtained after recombination is a virus with TK gene deletion. Figure 4 It is a schematic diagram of the deletion position of the TK gene and the position of the TKA and TKB homology arms on the genome.

[0119] 1.1.1. Amplification and cloning of homologous recombination arm

[0120] 1.1.1.1 Primer design and template preparation

[0121] A...

Embodiment 3

[0207] Example 3 Preparation of PRV HN1201TK- / gE- / gI- / UL21-deleted strain

[0208] 3.1 Construction of GFP intermediate transfer vector required for deletion of UL21 in PRV HN1201

[0209] Prepare PRV HN1201TK with embodiment 2 - / gE - / gI - strain. According to the sequence of the UL21 gene to be deleted, design homology arms at its two ends, respectively UL21A and UL21B. UL21A and UL21B were cloned into pUC19 vector and named pUCUL21AB. Then the GFP gene was cloned into pUCUL21AB to obtain a recombinant virus transfer vector, which was named pUCUL21A-GFP-B. The homology arms in the transfer vector are the sequences on both sides of UL21, so the recombinant virus obtained after recombination is the deletion of the UL21 gene. The schematic diagram of recombinant transfer vector construction is shown in figure 1 , figure 2 is the location of the UL21A and UL21B homology arms on the genome.

[0210] 3.1.1. Amplification and cloning of homologous recombination arm

[0...

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Abstract

The invention provides an attenuated strain of porcine pseudorabies virus, wherein the attenuated strain of porcine pseudorabies virus is a mutant strain of porcine pseudorabies virus lacking the UL21 gene. The invention also provides a vaccine composition comprising the antigen of the attenuated strain of porcine pseudorabies virus, a preparation method and application thereof. Live vaccine immunogenicity test and pathogenicity immunogenicity test prove that the porcine pseudorabies live vaccine has good protection, basically has no clinical symptoms, and shows good immune protection.

Description

technical field [0001] The invention relates to a porcine pseudorabies virus gene deletion strain, a prepared vaccine composition thereof, a preparation method and application thereof, and belongs to the field of animal virology. Background technique [0002] Pseudorabies, also known as Aujeszky's disease, is a disease of pigs, cattle, sheep and other domestic animals, poultry and wild animals caused by porcine herpesvirus type Ⅰ (Suid herpesvirus 1 strain) in the α subfamily of Herpesviridae (Herpesviridae) An acute infectious disease characterized by fever, severe itching (except pigs) and encephalomyelitis. Pseudorabies in pigs is widespread in our country and is seriously harmful. It is one of the main diseases restricting the production of large-scale pig farms. It can cause abortion in pregnant sows, stillbirth or mummified fetuses and piglets with neurological symptoms, paralysis, and high mortality. PRV has strong pantropicity, neurotropicity, and latent infection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N7/04A61K39/245A61K39/295A61P31/22C12R1/93
Inventor 张许科孙进忠谭菲菲肖燕田克恭
Owner PULIKE BIOLOGICAL ENG INC
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