Clostridioides difficile Surface Protein Antigens for Vaccine Design

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Solution Overview

Problem

Previous vaccines against Clostridioides difficile infection (CDI) have been unsuccessful due to targeting toxins systemically rather than the bacterial cell surface, failing to prevent colonization.

Innovation Solution

A vaccine composition comprising specific C. difficile surface proteins or immunogenic fragments thereof, such as FIgG, FIgE, and FIgK, is developed to target the bacterial cell surface, potentially preventing colonization and infection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If C. difficile toxins are used as antigens in vaccines, then neutralization of toxins is achieved, but colonization by the organism is not prevented

Engineering Contradiction:

Improvevaccine efficacyVSAvoidprevention of colonization

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent extracts the surface proteins (FIgG, FIgE, FIgK) from the complete C. difficile organism and uses them as isolated antigens in the vaccine composition. This extraction allows the vaccine to target specific surface structures involved in colonization without including the toxins, thereby preventing colonization while avoiding toxin-related side effects

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses surface proteins as intermediary antigens that mediate between the immune system and the bacterial cell surface. These proteins serve as safe intermediaries that elicit protective immune responses against colonization without the harmful effects of toxins, bridging the gap between immune activation and safe antigen use

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-generated harmful factors

If toxins are targeted systemically, then toxin neutralization occurs, but the source of infection (bacterial cell surface) is not addressed

Engineering Contradiction:

Improvetoxin neutralizationVSAvoidcolonization prevention

Core Design Contradiction:

Object-generated harmful factorsVSObject-affected harmful factors

Solution Approach 1:

Instead of targeting the toxins produced by C. difficile (the harmful output), the patent inverts the approach and targets the surface proteins on the bacterial cell surface (the source of infection). This inversion allows prevention of colonization at its origin, stopping the infection before toxins are produced and released

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The vaccine composition effectively reduces weight loss and mortality in animal models, elicits an immune response, and does not increase serum IgG or fecal IgA levels, indicating its potential in preventing CDI.

Implementation Method 1

the vaccine composition effectively reduces weight loss and mortality in animal models, elicits an immune response

Methodology Applied

Scientific EffectImmune response:

Data Source

PatentUS20240390470A1Non-Toxin Antigens For Clostridioides Difficile Vaccine

Publication Date: 2024.11.28 VANDERBILT UNIV

AI summary

Disclosed herein are C. difficile surface proteins that can serve as antigens in a vaccine to prevent C. difficile infection. While many trials have been focused on the use of the C. difficile toxins as antigens, the neutralization of toxins does not prevent colonization by the organism.