Mass Spectrometry Drug Resistance Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining drug resistance in microorganisms are neither rapid nor accurate, often requiring several hours or days for results and prone to false positives, which is problematic in infectious disease and bioterrorism scenarios where time is critical.
Innovation Solution
A system utilizing mass spectrometry with isotopic labeling and algorithmic analysis to detect and characterize drug resistance by comparing mass shifts of biomarker molecules from samples grown in isotopically-labeled and control media, allowing for rapid and accurate identification of drug-resistant microorganisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If classical microbiology techniques are used to determine drug resistance, then the determination can be performed with standard equipment, but the process takes between 24 and 48 hours which is too slow for critical scenarios
Solution Approach 1:
The patent replaces classical microbiological methods with mass spectrometry technology. Instead of monitoring organism proliferation through optical density changes over 24-48 hours, the system uses mass spectrometry to detect drug resistance through isotopic labeling of biomolecules, reducing determination time to hours while maintaining accuracy through spectral analysis of labeled versus unlabeled biomarkers.
Solution Approach 2:
The system changes the measurement parameter from optical density (turbidity) to mass-to-charge ratio of ionized biomolecules. By incorporating isotopically labeled amino acids into growing microorganisms and detecting the mass shift in biomolecules through mass spectrometry, the system achieves rapid drug resistance determination without requiring prolonged incubation periods.
2Adaptability or versatility
If PCR methods are used for antibiotic susceptibility testing, then the results are faster than classical methods, but the methods are narrow-band and require organism identification first
Solution Approach 1:
The mass spectrometry system performs multiple functions simultaneously: it identifies the microorganism through spectral pattern recognition, determines drug resistance through isotopic labeling analysis, and characterizes biomolecular changes all in a single integrated workflow. This eliminates the sequential process required by PCR methods where organism identification must precede susceptibility testing.
Solution Approach 2:
The system incorporates isotopically labeled amino acids into the growth medium beforehand, so that when microorganisms grow, they automatically incorporate these labels into their biomolecules. This preliminary labeling action enables direct detection of drug resistance effects without requiring prior organism identification or separate preparation steps.
3Reliability
If existing drug resistance determination systems are used, then the processes are established and reliable, but they produce false positives and require hours or days for results
Solution Approach 1:
The system uses isotopically labeled amino acids as intermediaries to track drug resistance effects. By incorporating these labeled building blocks into microbial biomolecules during growth, the system creates a detectable mass shift signal that directly reflects whether the microorganism is growing in the presence of the drug, providing clear evidence of resistance or susceptibility without relying on indirect growth measurements that produce false positives.
Solution Approach 2:
The mass spectrometry system provides real-time feedback by continuously monitoring the mass-to-charge ratio of ionized biomolecules from the growing culture. The algorithmic analysis compares observed mass shifts against predicted shifts, providing immediate feedback on drug resistance status and enabling rapid determination within hours rather than days.
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
Enables rapid and accurate determination of drug resistance in microorganisms, reducing the time required for identification and minimizing false positives, thereby improving response times in infectious disease and bioterrorism scenarios.
Implementation Method 1
isotopic labeling is the technique used to label and track drugs or molecules that incorporate defined isotopes
Implementation Method 2
mass spectrometry acquisition module down-stream from the sample growth and processing module for detecting and analyzing the isotopically-labeled and processed sample
Data Source
AI summary
The present invention is based on the discovery that drug resistance in microorganisms can be rapidly and accurately determined using mass spectrometry. A mass spectrum of an intact microorganism or one or more isolated biomarkers from the microorganism grown in drug containing, isotopically-labeled media is compared with a mass spectrum of the intact microorganism or one or more isolated biomarkers from the microorganism grown in non-labeled media without the drug present. Drug resistance is determined by predicting and detecting a characteristic mass shift of one or more biomarkers using algorithms. The characteristic mass shift is indicative that the microorganism is growing in the presence of the drug and incorporating the isotopic label into the one or more biomarkers, resulting in change in mass.