Engineered Targeting Molecules for Microbe Detection
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Solution Overview
Problem
Current methods for detecting microbes in septic patients, such as MALDI-TOF MS, are limited by the need for blood culture positivity and the inability to distinguish closely related species, and often require culturing steps that are not feasible in time-sensitive situations, especially when patients are blood culture negative or have low pathogen levels.
Innovation Solution
The use of engineered microbe-targeting molecules linked to supports for isolating microbes or their components, followed by mass spectrometric detection, which eliminates the need for culturing and allows for rapid identification of pathogens directly from whole blood, even in blood culture-negative patients, using techniques like immunomagnetic separation and clustering processes to enhance signal-to-noise ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MALDI-TOF MS is used for microbial identification, then identification accuracy is improved, but the method requires blood culture positivity which limits applicability to only 15-30% of septic patients
Solution Approach 1:
The method segments the detection process into two independent parts: (1) enrichment of microbial components using engineered targeting molecules that bind specifically to pathogen-associated molecular patterns, and (2) identification using MALDI-TOF MS. This segmentation allows the system to work with blood culture-negative patients by enriching microbial components directly from blood samples without requiring live culture growth.
Solution Approach 2:
Engineered microbe-targeting molecules serve as intermediaries between the patient's blood sample and the MALDI-TOF MS detection system. These molecules specifically bind to microbial components while being resistant to proteolysis and heat, enabling the detection of microbial signatures even when live cultures cannot be obtained.
2Measurement precision
If culturing steps are performed for microbial identification, then species differentiation is improved, but detection time increases which is not feasible in time-sensitive situations
Solution Approach 1:
The method performs preliminary enrichment of microbial components using engineered targeting molecules before detection. This preliminary action concentrates pathogen-associated molecular patterns from the blood sample, enabling direct MALDI-TOF MS analysis without requiring time-consuming culturing steps, thus reducing detection time from hours to minutes while maintaining species differentiation capability.
3Measurement precision
If standard MALDI-TOF MS is used on cultured samples, then identification is achieved, but the method cannot distinguish closely related species such as Shigella spp. and E. coli
Solution Approach 1:
The method applies local quality by using engineered targeting molecules with specific binding properties that enrich for particular microbial components. The clustering process then applies localized analysis to specific mass spectral regions, enhancing the ability to distinguish closely related species by focusing on species-specific molecular signatures rather than attempting to resolve all spectral features.
4Productivity
If broad-spectrum antibiotics are administered empirically, then initial treatment is provided, but toxicity increases and treatment may not be optimal for the specific infectious agent
Solution Approach 1:
The method implements feedback by rapidly identifying the specific pathogen causing sepsis through engineered targeting molecule enrichment combined with MALDI-TOF MS detection. This feedback loop provides clinicians with specific pathogen identification within minutes to hours, enabling transition from empirical broad-spectrum antibiotic therapy to targeted pathogen-specific treatment, thereby reducing antibiotic toxicity while maintaining effective treatment.
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
This approach enables rapid, culture-free detection of microbes in septic patients, reducing the time to identification from hours to minutes and improving patient outcomes by providing targeted therapies, even in cases where standard methods fail due to low pathogen levels or antibiotic treatment.
Implementation Method 1
contacting a sample with at least one engineered microbe-targeting molecule linked to a support; isolating the microbe(s) or microbe components bound to the at least one engineered microbe-targeting molecule
Implementation Method 2
detecting the microbe(s) or microbe components using a mass spectrometric method; Matrix-Assisted Laser Desorption-Ionization Time-of-Flight mass spectrometry
Implementation Method 3
Matrix-Assisted Laser Desorption-Ionization Time-of-Flight mass spectrometry (MALDI-TOF MS)
Data Source
AI summary
The technology described herein is directed to methods for detection of microbes and microbe components. In some embodiments of any of the aspects, the methods comprise methods of microbe isolation, sample preparation, mass spectrometry, or analysis. In some embodiments of any of the aspects, such methods can be applied to detect at least one microbe or at least one microbial component in a sample, including not limited to a patient sample, an animal model sample, an environmental sample, or a non-biological sample.