Chitin-Binding Protein Magnetic Capture for Rapid Fungal Detection
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Solution Overview
Problem
Current methods for detecting invasive fungal infections are inefficient, often requiring long turnaround times and lack specificity, especially in immunocompromised individuals, leading to missed diagnoses and treatment failures.
Innovation Solution
A chitin-binding protein (CBP) is used in conjunction with magnetic beads and a rapid amplification method, specifically recombinase polymerase amplification (RPA) combined with CRISPR/Cas12a, to rapidly and accurately detect fungal pathogens, particularly Candida albicans, in clinical samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fungal culture methods are used, then the detection can identify fungal pathogens, but the turnaround period is long and sensitivity is low
Solution Approach 1:
The patent combines chitin affinity magnetic separation with RPA-CRISPR/Cas12a detection into a unified workflow. The magnetic beads coated with chitin-binding protein first capture fungal cells from clinical samples, then the captured cells are directly processed for RPA amplification and CRISPR/Cas12a detection in the same system, eliminating separate culture steps and achieving both high sensitivity and rapid results within 120 minutes
Solution Approach 2:
The patent performs preliminary enrichment of fungal targets using chitin affinity magnetic separation before detection. The magnetic beads coated with chitin-binding protein pre-capture fungal cells from complex clinical samples, concentrating the target organisms and removing interfering substances beforehand. This preliminary action enables subsequent rapid detection with high sensitivity without requiring lengthy culture periods
2Measurement precision
If molecular techniques like PCR and MALDI-TOF mass spectrometry are used, then detection accuracy improves, but equipment cost and technical requirements increase
Solution Approach 1:
The patent replaces complex mechanical detection systems (PCR thermal cyclers, MALDI-TOF mass spectrometers) with an isothermal amplification system (RPA) combined with CRISPR/Cas12a detection. The RPA reaction proceeds at constant temperature (37-42°C) without thermal cycling equipment, and the CRISPR/Cas12a detection generates fluorescent signals that can be read by simple fluorometers or even visualized colorimetrically, eliminating the need for expensive specialized equipment while maintaining high detection accuracy
Solution Approach 2:
The patent changes the detection parameters from high-complexity equipment-based methods to isothermal chemical-biological reactions. By using isothermal amplification instead of thermal cycling PCR, and CRISPR/Cas12a cleavage-based detection instead of mass spectrometry, the system achieves comparable or superior detection accuracy with significantly reduced equipment requirements and technical complexity
3Productivity
If RPA-CRISPR/Cas12a system is used, then detection speed and sensitivity improve, but interference between RPA and CRISPR/Cas12a systems occurs
Solution Approach 1:
The patent segments the detection system into distinct functional modules with separate reaction compartments or sequential processing steps. The RPA amplification and CRISPR/Cas12a detection are performed in a coordinated manner where each system operates in its optimized condition, minimizing mutual interference while maintaining rapid detection speed and high reliability
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 method allows for rapid, sensitive, and specific detection of fungal pathogens within 120 minutes, achieving a detection sensitivity of 3×10 colony-forming units per milliliter, and is suitable for point-of-care testing.
Implementation Method 1
Chitin is a polysaccharide synthesized by a broad family of chitin synthase (CHS) enzymes and covalently bound to the dextran to form a complex polysaccharide network, which forms a firm structure and clastic basis of fungal cell walls
Implementation Method 2
A chitin-binding protein (CBP) is used in conjunction with magnetic beads and a rapid amplification method
Implementation Method 3
recombinase polymerase amplification (RPA) combined with CRISPR/Cas12a, to rapidly and accurately detect fungal pathogens
Implementation Method 4
recombinase polymerase amplification (RPA) combined with CRISPR/Cas12a, to rapidly and accurately detect fungal pathogens
Data Source
AI summary
A chitin-binding protein for detecting fungi and an application thereof, and an affinity molecule detection method of the fungi are provided, relating to the field of fungus detection technologies. The chitin-binding protein includes ChBD2, ChBD3, EfCBP-1, PfCBP-A, PfCBP-B, BcCBP-1, or ScCBP-1. The chitin-binding protein can be used to detect the fungi. The affinity molecule detection method of the fungi can quickly and accurately quantitatively detect Candida albicans by combining a chitin affinity protein with recombinase polymerase amplification-clustered regularly interspaced short palindromic repeats/CRISPR related protein 12a (RPA-CRISPR/Cas12a). The whole reaction can be completed within 120 minutes, and the detection sensitivity of Candida albicans reaches 3×101 colony-forming units per milliliter (CFU/mL).