Chimeric Antigen Vaccine for Cattle Tick Control
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Solution Overview
Problem
Current vaccines for protecting cattle against Rhipicephalus microplus tick infestations are either ineffective or require frequent booster injections, and there is a need for a vaccine that can provide consistent and efficacious protection against this economically significant tick species.
Innovation Solution
A modified M. haemolytica lktCA gene cluster cassette is used, incorporating a polynucleotide encoding a tetanus toxin P2 epitope and a tick aquaporin 1 protein fragment, which is inserted downstream of the native leukotoxin A start codon, to elicit an immune response and reduce tick infestation in cattle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bm86 immunomodulator is used to protect cattle against R. microplus tick infestations, then protection effectiveness is improved (30-40% effective), but the duration of action is insufficient requiring frequent booster injections every 6 months
Solution Approach 1:
The patent modifies the Bm86 protein structure by fusing it with a tetanus toxin P2 epitope and a tick aquaporin 1 protein fragment, creating a chimeric antigen that enhances both the effectiveness and duration of protection. This structural parameter change allows the vaccine to elicit a more persistent immune response, reducing the frequency of booster injections required while maintaining reliable protection against R. microplus.
2Reliability
If Combavac 3 in 1 live tick fever vaccine is used, then protection against tick-borne diseases is provided, but the vaccine is not registered in the USA and does not directly kill ticks
Solution Approach 1:
The patent combines multiple functional elements into a single chimeric antigen: the Bm86 immunomodulator domain for immune system modulation, the tetanus toxin P2 epitope for enhanced immunogenicity, and the tick aquaporin 1 protein fragment for direct tick-specific targeting. This merging creates a versatile vaccine that can both protect against tick-borne diseases and provide direct tick control, making it adaptable for USA registration and implementation.
3Object-affected harmful factors
If acaricides are used to treat cattle at the Texas-Mexico border to prevent reintroduction of SCFT, then tick control is achieved, but acaricide-resistant cattle tick populations have developed
Solution Approach 1:
The patent replaces the mechanical/chemical approach of acaricide treatment with a biological approach using a recombinant chimeric antigen vaccine. Instead of relying on chemical substances that ticks can develop resistance against, the vaccine utilizes a genetically engineered antigen that stimulates the cattle's own immune system to produce antibodies against tick-specific targets, particularly the aquaporin 1 protein, thereby substituting chemical control with immunological control.
Data Source
AI summary
This invention relates to novel fusion peptides and immunogenic compositions containing the fusion peptides useful in the control and prevention of tick infestations. The invention also relates to compositions comprising said fusion peptides, methods of vaccination against tick infestation using said fusion peptides and compositions, and kits for use with such compositions and methods.