Clostridium perfringens Pilus Polypeptide Vaccine for Poultry Necrotic Enteritis
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Solution Overview
Problem
Current vaccines against necrotic enteritis in poultry offer only partial protection and are not specific to necrotic enteritis-causing strains, necessitating the development of alternative Clostridium perfringens polypeptides as vaccine candidates.
Innovation Solution
Identification and utilization of Clostridium perfringens pilus polypeptides, such as CnaA, FimA, and FimB, as immunogenic agents to develop a vaccine that specifically targets necrotic enteritis-causing strains by eliciting an immune response in poultry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current vaccines against necrotic enteritis are used, then poultry receive some level of protection, but the protection is only partial and not specific to necrotic enteritis-causing strains
Solution Approach 1:
The vaccine approach is segmented by targeting specific virulence factors (NetB toxin, collagen adhesion proteins, pilus proteins) rather than using whole-cell or non-specific antigens. This segmentation allows the vaccine to specifically recognize and protect against necrotic enteritis-causing strains while ignoring other Clostridium perfringens strains that lack these specific virulence factors.
Solution Approach 2:
The vaccine employs local quality by using recombinant proteins expressed in E. coli that specifically mimic the virulence factors of C. perfringens type A strains. These recombinant antigens (NetB, CnaA, FimA, FimB) provide localized specificity to the immune response, enabling protection against strains with these specific virulence determinants while maintaining broad coverage among necrotic enteritis-causing strains.
2Reliability
If in-feed antibiotics are used to control necrotic enteritis, then disease control is achieved, but antimicrobial resistance spreads and production is phased out
Solution Approach 1:
The invention converts the harmful reliance on antibiotics into a beneficial vaccine-based approach. By using recombinant virulence factor proteins as vaccines, the harmful practice of antibiotic administration is replaced with a safe immunological approach that eliminates antimicrobial resistance while maintaining effective disease control through specific immune recognition of C. perfringens virulence factors.
Solution Approach 2:
The mechanical system of antibiotic administration is replaced with an immunological system. Instead of using antibiotics to directly kill bacteria, the vaccine stimulates the poultry's immune system to produce antibodies against specific C. perfringens virulence factors, providing passive and active immunity without the harmful side effects of antimicrobial resistance.
3Ease of manufacture
If previous Clostridium perfringens proteins are used as vaccine candidates, then vaccine development is possible, but protection is at best partial and proteins are not specific to necrotic enteritis strains
Solution Approach 1:
The vaccine approach achieves universality by targeting conserved virulence factors (NetB toxin, collagen adhesion proteins, pilus proteins) that are present across multiple necrotic enteritis-causing C. perfringens strains. The recombinant proteins expressed in E. coli serve as universal antigens that elicit broad protection against different strains while maintaining ease of manufacture through standardized recombinant expression systems.
Data Source
AI summary
An immunogenic polypeptide selected from an isolated Clostridium perfringens pilus polypeptide, a variant of the pilus polypeptide; a fragment of the pilus polypeptide; and a fragment of the variant, is useful for the preparation of a vaccine for the treatment or prevention of enteric necrosis in poultry. The isolated Clostridium perfringens pilus polypeptide includes an assembled pilus or the pilus subunits CnaA, FimA and/or FimB.