Immunogenic Composition for Proteobacteria Transmission Break
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vaccines against non-Typhoidal Salmonella (NTS) and pathogenic E. coli are ineffective due to the rapid evolution of vaccine-escape variants, which carry chemical modifications in the O-antigen, leading to incomplete protection and selective pressure that drives the emergence of variants that no longer bind to vaccine-induced antibodies.
Innovation Solution
Development of an immunogenic composition comprising inactivated serovar-variants of Proteobacteria with genetic modifications in O-antigen production and modification enzymes, such as glucosylation and O-acetylation, to drive pathogen evolution into a non-transmissible form, creating an 'evolutionary trap' that prevents efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vaccines use standard O-antigen targets, then initial immune protection is achieved, but rapid evolution of vaccine-escape variants occurs
Solution Approach 1:
The vaccine divides the O-antigen into multiple independent epitope regions (N-terminal, central, C-terminal domains) and presents them separately through different serovar variants. This segmentation prevents bacteria from evolving a single escape mutation that would confer resistance to all vaccine components simultaneously, as each epitope region can be targeted by different antibody specificities.
Solution Approach 2:
The vaccine introduces serovar variants with localized modifications to the O-antigen structure, such as different sugar residues (glucose, galactose, rhamnose) at specific positions. These local structural variations create distinct epitope characteristics that elicit targeted immune responses against specific bacterial surface regions, making it difficult for pathogens to evolve universal escape mechanisms.
2Reliability
If vaccines induce strong immune response, then protection is enhanced, but selective pressure drives emergence of non-binding variants
Solution Approach 1:
The vaccine combines multiple serovar variants that collectively target universal conserved regions of the O-antigen across different Salmonella strains. By focusing immunity on these conserved, functionally essential regions that cannot be easily modified without compromising bacterial survival, the vaccine achieves broad-spectrum protection while minimizing selective pressure for escape variant emergence.
Solution Approach 2:
The vaccine exploits the fact that certain O-antigen modifications necessary for bacterial survival and virulence also create consistent immunogenic epitopes. By targeting these essential structural features, the vaccine converts the bacteria's need to maintain specific O-antigen functions into an opportunity for effective immune recognition, where escape mutations would be lethal to the pathogen.
Data Source
AI summary
The present invention relates to an immunogenic composition for Proteobacteria protection and reduced transmission. We have identified Proteobacteria serovar variant combinations that generate an immune response capable of robustly driving bacterial enteropathogens into an evolutionary dead end and reducing the transmission of the bacterium. These inactivated immunogenic positions and typically oral vaccines are easy to apply, cheap to produce, and can be stored long-term without cold-chain requirements making them ideal for application in livestock, or in resource-poor areas. They are believed to be the only immunogenic compositions and vaccine formulations capable of breaking the chain of transmission for these types of pathogen.