IDF Permeabilization for Mycobacterium Detection
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Solution Overview
Problem
Current methods for cell permeabilization after fixation are either ineffective, too rigorous, or require expensive equipment, making it difficult to detect internal cellular components, especially for Mycobacterium species due to their thick cell walls, which hinder the delivery of probes for detection and differentiation.
Innovation Solution
The use of an IDF solution comprising chaotropic salts, ionic and non-ionic detergents, and other reagents to create channels in cell walls and membranes, allowing probes to penetrate and detect nucleic acids or proteins within Mycobacterium cells, even after fixation, using methods like in situ hybridization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fixation is performed to preserve cellular structure, then cellular molecules are set in place and degradation is prevented, but the ability to detect internal cellular components is hampered
Solution Approach 1:
The patent applies preliminary action by performing permeabilization treatment on fixed cells before probe hybridization. The IDF solution is applied to create channels in the cell wall and membrane structures after fixation, allowing probes to penetrate and detect internal components while the fixed structure remains preserved. This sequence resolves the contradiction by preparing the cell for detection without compromising the preserved state.
Solution Approach 2:
The patent uses an intermediary substance - the IDF solution comprising chaotropic salts, detergents, and other reagents - to mediate between the fixed cellular structure and the detection probes. This intermediary creates permeable channels that allow probe penetration while maintaining the fixed state of cellular molecules, thus resolving the contradiction between preservation and detectability.
2Difficulty of detecting and measuring
If standard lysis procedures with detergents are used to access internal components, then nucleic acids can be released, but the thick mycolate-rich cell wall of Mycobacterium prevents effective penetration
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and concentration parameters of the permeabilization solution. The IDF solution contains specific concentrations of chaotropic salts (0.5-4.5M), detergents (0.1-2.0%), and other reagents that are optimized to interact with the mycolate-rich cell wall. These parameter adjustments enable effective penetration through the thick cell wall while maintaining cell wall integrity during fixation.
Solution Approach 2:
The patent uses a composite permeabilization solution containing multiple components working together - chaotropic salts, ionic and non-ionic detergents, and other reagents in specific proportions. This composite formulation synergistically interacts with the mycolate-rich cell wall to create permeable channels, overcoming the barrier that would be insurmountable by any single agent.
3Ease of operation
If mechanical methods such as sonication or electroporation are used for permeabilization, then cell membranes can be disrupted, but expensive equipment is required and the methods usually only work on unfixed samples
Solution Approach 1:
The patent replaces mechanical permeabilization methods (sonication, electroporation) with a chemical permeabilization system. The IDF solution chemically disrupts the cell wall and membrane structures through chaotropic salts and detergents, eliminating the need for expensive mechanical equipment while maintaining effectiveness on fixed samples. This substitution resolves the contradiction by achieving permeabilization through chemistry rather than mechanics.
4Difficulty of detecting and measuring
If rigorous permeabilization methods are used to create channels in cell membranes, then probe penetration is improved, but the structures to be studied are destroyed
Solution Approach 1:
The patent applies local quality by creating localized channels or pores in specific regions of the cell wall and membrane while maintaining the integrity of the overall cellular structure. The IDF solution selectively permeabilizes the cell envelope to allow probe penetration without destroying the fixed cellular molecules and structures that need to be studied. This localized approach resolves the contradiction between penetration and structural integrity.
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 enhances the sensitivity and accuracy of detecting and differentiating Mycobacterium species by improving probe penetration and retention of cellular components, facilitating more effective diagnostic methods for clinical samples and cultures.
Implementation Method 1
The use of an IDF solution comprising chaotropic salts, ionic and non-ionic detergents, and other reagents to create channels in cell walls and membranes
Implementation Method 2
The use of an IDF solution comprising chaotropic salts, ionic and non-ionic detergents, and other reagents to create channels in cell walls and membranes
Implementation Method 3
allowing probes to penetrate and detect nucleic acids or proteins within Mycobacterium cells, even after fixation, using methods like in situ hybridization
Data Source
AI summary
The present invention relates to compositions and methods for detecting Mycobacterium genus (Mycobacterium sp.) bacteria (e.g., M. tuberculosis) and M. avium complex (MAC; M. avium, M. scrofulaceum and M. intracellulaire) in a clinical sample or culture. The present invention also relates to differentiating cultures or samples comprising (Mycobacterium sp.) bacteria (e.g., M. tuberculosis) from cultures or samples comprising M. avium complex (MAC; M. avium, M. scrofulaceum and M. intracellulaire).