Multiplexed Serum Bactericidal Assays for Resistant Gram-Negative Strains

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Solution Overview

Problem

Current assays for evaluating the efficacy of vaccines against antibiotic-resistant gram-negative bacteria are limited by the need for specialized equipment, complexity, and inability to be multiplexed, particularly for Shigella strains, which are a significant cause of diarrhea worldwide, and there is a need for high-throughput methods to assess protection against multiple strains.

Innovation Solution

A novel multiplexed serum-based bactericidal assay (SBA) using human or baby rabbit complement to detect the efficacy of vaccines against multiple gram-negative bacterial strains, including Shigella, Salmonella, and others, by complement-mediated cytotoxicity, with strains resistant to different antibiotics, allowing for multiplex format evaluation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a singleplex bactericidal assay is used to evaluate vaccine efficacy against one bacterial strain, then the assay is simple and requires minimal equipment, but it cannot assess protection against multiple strains simultaneously

Engineering Contradiction:

Improveability to assess multiple bacterial strainsVSAvoidassay complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple singleplex bactericidal assays into a single multiplexed assay by using a 96-well plate format where multiple bacterial strains are tested simultaneously. Each well contains a specific bacterial strain, and the assay evaluates vaccine efficacy against all strains in parallel, achieving both simplicity and multi-strain assessment capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The multiplexed bactericidal assay serves multiple functions simultaneously: it evaluates vaccine efficacy against different bacterial strains, determines antibody titers, and provides specificity data all in a single assay. The universal 96-well plate format accommodates various bacterial strains and vaccine candidates, making the system highly versatile without requiring separate assays for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If ATP measurement methods are used to determine killed bacteria, then high throughput is achieved, but specialized equipment is required and multiplexing is not possible

Engineering Contradiction:

ImprovethroughputVSAvoidspecialized equipment requirement

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces complex automated ATP measurement systems with a simpler visual readout method using chromogenic substrates. The bacterial ATP is converted to a colored product through enzymatic reaction, allowing manual or basic automated reading without requiring specialized equipment. This substitution maintains high throughput capability while eliminating the need for complex instrumentation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If fluorescent molecules are used to detect bacterial killing, then multiplexing is achieved, but the assay becomes highly complex and requires specialized equipment

Engineering Contradiction:

Improvemultiplexing capabilityVSAvoidassay complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent uses chromogenic substrates that produce color changes when acted upon by bacterial enzymes during ATP metabolism. Different bacterial strains produce different color patterns or intensities, allowing visual differentiation and multiplexing without requiring fluorescent detection equipment. The color change provides a simple, direct readout that maintains multiplexing capability while avoiding complex instrumentation requirements.

Inventive Principle:

Principle #32Color changes

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 assay effectively evaluates the ability of antiserum to kill multiple antibiotic-resistant bacterial strains, providing a robust, high-throughput method for assessing vaccine efficacy and specificity, suitable for use in kits with reagents and instructions, facilitating the development of multivalent vaccines.

Implementation Method 1

detect the ability of antiserum elicited against the putative vaccine to kill 3 or more different gram-negative bacterial strains optionally of the same genus by complement-mediated cytotoxicity (CDC)

Methodology Applied

Scientific EffectComplement-mediated cytotoxicity:

Data Source

PatentUS20250327110A1HIGH THROUGHPUT MULTIPLEXED SERUM BASED BACTERICIDAL ASSAYS (SBAs), AND KITS FOR USE THEREIN

Publication Date: 2025.10.23 SUNFIRE BIOTECHNOLOGIES

AI summary

The present disclosure provides multiplexed serum-based assays (SBA's) for detecting the efficacy and/or specificity of a putative vaccine to elicit protective or functional antibodies which elicit complement-mediated killing of 3 or more different gram-negative bacterial strains optionally of the same genus, wherein the SBA is conducted in multiplex format using (i) each of said 3 or more gram-negative bacterial strains which respectively are resistant to a different antibiotic relative to the other gram-negative bacterial strains and (ii) complement, e.g., baby rabbit complement.