Heat-resistant phenotype stable inheritance, avirulent strain of recombinant foot-and-mouth disease virus carrying negative markers and bivalent inactivated vaccine of type o/a foot-and-mouth disease

A technology of foot-and-mouth disease virus and avirulent strains, applied in the direction of virus/phage, virus, vaccine, etc., can solve problems such as failure to find, limitation of animal species, attenuation, etc., to increase stability, solve hidden safety hazards, improve quality effect

Active Publication Date: 2022-03-04
HARBIN VETERINARY RES INST CHINESE ACADEMY OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of using traditional passage adaptation technology or modern genetic engineering technology, FMDV attenuation research has encountered an insurmountable obstacle, that is, the attenuated phenotype produced is limited by animal species, and the three Effective method and approach for attenuating poison of main artiodactyly pigs, cattle and sheep
Existing studies on genetic engineering attenuation of foot-and-mouth disease virus mainly focus on the non-structural proteins L, 3A and 3D of the virus, but none of them can solve this problem

Method used

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  • Heat-resistant phenotype stable inheritance, avirulent strain of recombinant foot-and-mouth disease virus carrying negative markers and bivalent inactivated vaccine of type o/a foot-and-mouth disease
  • Heat-resistant phenotype stable inheritance, avirulent strain of recombinant foot-and-mouth disease virus carrying negative markers and bivalent inactivated vaccine of type o/a foot-and-mouth disease
  • Heat-resistant phenotype stable inheritance, avirulent strain of recombinant foot-and-mouth disease virus carrying negative markers and bivalent inactivated vaccine of type o/a foot-and-mouth disease

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1 FMDV (R4) virus strain is to the evaluation of pig pathogenicity

[0056] Previous studies have found that the IRES chimeric virus FMDV (R4) generated by replacing FMDV IRES domain 4 (IRES-Fd4) with bovine rhinovirus (BRBV) IRES domain 4 (IRES-Bd4) has a 10 6 TCID 50 / The first dose of neck muscle inoculation of natural host pigs does not show any clinical symptoms of foot-and-mouth disease, does not produce viremia, oral and nasal cavity does not shed toxin, and the virus does not induce antibodies in pigs, indicating that the virus has lost replication in susceptible animals For details, please refer to the Chinese invention patent (CN108085302A) and the international PCT patent (application publication number: WO / 2018 / 090994). In order to further evaluate the pathogenicity of FMDV (R4) to pigs, the most sensitive heel intradermal inoculation route was used, and a higher FMDV (R4) inoculation dose (10 7 TCID 50 / head or 10 8 TCID 50 / head), and inoc...

Embodiment 2

[0060] Example 2 Comparison of molecular labeling methods on 3B protein

[0061] In order to construct a molecular marker virus that can be used for differential diagnosis, this experiment conducted a comparative study on the molecular marker methods on the 3B protein. The inventor's laboratory obtained a monoclonal antibody 2H1 against FMDV non-structural protein 3B2 in the previous research, and determined the antigenic epitope it recognizes. The epitope motif is 34 KPLKVK 39 , K 34 、K 37 and V 38 It is the key amino acid of this epitope (CN109295005A, invention patent application number: 201811126187.4). In order to inactivate the epitope recognized by the monoclonal antibody 2H1 and introduce the antigen molecular marker, the key amino acid K of the 2H1 epitope is replaced with alanine (A) at the same time 37 and V 38 , construct the eukaryotic expression plasmid pCI-3B1 of this 3B1 epitope inactivation m twenty three. In addition, the analysis of the antigenicity ...

Embodiment 3

[0062] Example 3 Screening of genetically stable FMDV heat-resistant mutants and determination of molecular determinants of heat-resistant phenotype

[0063] 1 Test method

[0064] 1.1 Thermal stress screening method for foot-and-mouth disease virus

[0065] The thermal pressure screening of the virus is to heat at a specific temperature for 30 minutes to inactivate 99.99% of the virus titer per unit volume, and to carry out repeated heat inactivation tests under the condition of gradually increasing the temperature until the temperature before and after heating Virus titers are approximately the same. Multiple rounds of heat selection were performed at temperatures of 51°C, 53°C, and 56°C until the emergence of highly heat-adapted virus mutants.

[0066] 1.2 Detection method of virus capsid stability

[0067] After the virus is treated at a higher temperature, the proportion of the 146S intact virus capsid is determined, which is a key indicator for judging the thermal sta...

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Abstract

The invention discloses a recombined foot-and-mouth disease virus avirulent strain with stable inheritance of heat-resistant phenotype and a negative marker and an O / A type foot-and-mouth disease bivalent inactivated vaccine. The present invention constructs FMDV virus cDNA infectious cloning plasmid, which carries the molecular determinants of the heat-resistant phenotype of the virus capsid, the molecular factors of losing the replication ability in vivo, the negative marker factors of the deletion of 3A and 3B protein epitopes, and the coding in P1 The introduction of Pst I enzyme cutting sites on both sides of the region can quickly construct and rescue a heat-stable and marked avirulent strain of foot-and-mouth disease virus by replacing its capsid protein coding region for any epidemic strain, and can be used as a seed virus for foot-and-mouth disease inactivated vaccine. Use this general-purpose plasmid to construct two strains of recombinant viruses against the current two dominant epidemic strains and use them to prepare O / A type foot-and-mouth disease bivalent inactivated vaccines, immunize animals to induce high levels of neutralizing antibodies and produce immune protection; use this vaccine to vaccinate animals for antibody The assay enables the differential diagnosis of vaccinated animals from naturally infected animals.

Description

technical field [0001] The present invention relates to virus full-length cDNA infectious cloning plasmid and the recombinant virus strain obtained by rescue using the full-length cDNA infectious cloning plasmid, especially relates to FMDV full-length cDNA infectious cloning plasmid and adopting reverse genetic technology to rescue the heat-resistant surface An avirulent recombinant foot-and-mouth disease virus strain with stable genetics and a negative marker of 3B epitope, the present invention further relates to the preparation of the O / A type foot-and-mouth disease bivalent inactivated vaccine by the recombinant foot-and-mouth disease virus avirulent strain or the preparation of differential diagnosis of foot-and-mouth disease vaccination animals The use in reagents for naturally infecting animals belongs to the field of construction and application of recombinant foot-and-mouth disease virus avirulent strains carrying markers stably in capsids. Background technique [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N7/04A61K39/295A61K39/135A61P31/14
CPCC07K14/005C12N7/00A61K39/12A61P31/14C12N2770/32122C12N2770/32162C12N2770/32134A61K2039/5252A61K2039/552
Inventor 于力杨德成王海伟周国辉孙超
Owner HARBIN VETERINARY RES INST CHINESE ACADEMY OF AGRI SCI
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