Single-Cell Reporter Analysis for Rapid Pathogen Identification
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Solution Overview
Problem
Conventional methods for identifying and characterizing disease-causing cells (DCCs) are limited by sensitivity, require complex sample preparation, and struggle with multiplex assays due to nonspecific interactions between reporter species, leading to inaccurate results and inefficiencies in detecting fastidious organisms and drug-resistant microbes.
Innovation Solution
An integrated workflow using a universal reporter molecule and single-step automated process that monitors time-dependent signals from cellular metabolism, respiration, and permeability without lysis or washing, allowing for rapid identification and characterization of DCCs in sub-nanoliter droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nucleic acid amplification tests are used for pathogen identification, then sensitivity is improved, but device complexity and sample preparation complexity increase
Solution Approach 1:
The patent extracts and eliminates the cell lysis step from the diagnostic workflow by using intact cells for analysis. This removes the need for complex nucleic acid extraction and purification steps while maintaining sensitivity through direct analysis of cellular properties and metabolites
Solution Approach 2:
The patent employs a universal reporter molecule that can detect multiple different pathogens and their drug resistance profiles simultaneously through a single assay platform, eliminating the need for pathogen-specific primers and probes required in traditional NATs
2Measurement precision
If cell lysis is performed to extract nucleic acid, then nucleic acid extraction efficiency is improved, but PCR inhibition increases due to lysis reagent carryover
Solution Approach 1:
The patent completely removes the cell lysis step from the workflow by analyzing intact cells directly. This eliminates the source of PCR inhibition (lysis reagents) while maintaining detection sensitivity through alternative detection methods that do not require nucleic acid extraction
Solution Approach 2:
The patent uses metabolic reporters and cellular metabolites as intermediary signals that can be detected without cell lysis. These intermediaries provide information about pathogen presence and drug resistance through metabolic activity rather than requiring direct nucleic acid amplification
3Adaptability or versatility
If multiplex NAT assays are designed to detect multiple targets, then pathogen identification capability is improved, but false positives and false negatives increase due to nonspecific interactions
Solution Approach 1:
The patent uses a universal reporter molecule that interacts with cellular components in a consistent manner across different pathogen targets. This universal approach avoids the nonspecific interactions between multiple pathogen-specific reporters that plague multiplex NAT assays
Solution Approach 2:
The patent segments the detection process by analyzing individual cellular properties (metabolite profiles, membrane permeability, respiration rates) separately and independently. Each property provides orthogonal information about pathogen identity and drug resistance, avoiding cross-interference between targets
4Ease of operation
If conventional analytical techniques are used for DCC identification, then method simplicity is maintained, but detection sensitivity is insufficient for low-abundance pathogens
Solution Approach 1:
The patent changes the detection parameters by measuring metabolic activity, respiration rates, and membrane permeability properties of intact cells rather than requiring nucleic acid amplification. This maintains operational simplicity while achieving high sensitivity through direct measurement of cellular physiological parameters
Solution Approach 2:
The patent replaces the mechanical and chemical processes of cell lysis and nucleic acid extraction with a non-invasive optical detection system that measures cellular properties in intact cells, simplifying the workflow while enhancing sensitivity
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 method provides rapid phenotypic susceptibility results within 4-6 hours, achieving the analytical sensitivity of nucleic acid amplification tests while offering clinical validity comparable to culture-based methods, enabling accurate and precise multiplexed identification and quantification of DCCs.
Implementation Method 1
a reporter that is reduced by cellular metabolism to produce a time-dependent signal
Implementation Method 2
each disease-causing cell exhibits unique metabolism, respiration, and permeability characteristics
Implementation Method 3
each disease-causing cell exhibits unique metabolism, respiration, and permeability characteristics
Data Source
AI summary
Certain embodiments of the invention are directed to evaluating and identifying cells by recording and interpreting a time-dependent signal produced by unique cell respiration and permeability attributes of isolated viable cells.