Candida Auris Detection Using 5.8S/ITS2 rRNA PCR
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Solution Overview
Problem
Candida auris is a multidrug-resistant fungus that is difficult to identify with standard laboratory methods, leading to misidentification and inappropriate management, particularly in healthcare settings where it can cause severe invasive infections.
Innovation Solution
A method for rapid detection of Candida auris in biological or non-biological samples using real-time polymerase chain reaction (PCR) with specific primers and probes designed to target the 5.8s/ITS2 rRNA gene, allowing for discrimination against nearest neighbors Candida haemulonii and Saccharomyces cerevisiae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard laboratory methods are used for identification, then the process is simple and accessible, but the identification accuracy is low leading to misidentification
Solution Approach 1:
The invention segments the identification process into multiple specific PCR tests targeting different genetic regions (beta-tubulin gene, ITS region, 5.8S rRNA gene). Each test focuses on specific genetic markers that differentiate C. auris from other Candida species, thereby improving identification accuracy through divided detection approaches rather than relying on a single complex method.
Solution Approach 2:
The invention introduces specific oligonucleotide primers and probes as intermediary elements that bind to unique genetic sequences of C. auris. These molecular intermediaries enable specific detection of the target organism by bridging the gap between the sample and the detection system, allowing accurate identification without requiring complex cultural or biochemical testing.
2Loss of time
If culture methods are used for diagnosis, then the approach is conventional and widely available, but the detection time is prolonged and identification is delayed
Solution Approach 1:
The invention performs preliminary genetic amplification using PCR to enrich target DNA sequences before detection. By pre-amplifying specific genetic regions known to be unique to C. auris, the method accelerates the detection process while ensuring that subsequent identification steps focus on highly specific markers, thereby reducing both time and improving accuracy.
Solution Approach 2:
The invention replaces traditional mechanical culture-based identification methods with molecular biology techniques (PCR and hybridization). This substitution eliminates the need for prolonged cultural growth and manual biochemical testing, significantly reducing detection time while providing more precise genetic-level identification of the species.
3Reliability
If broad-spectrum identification methods are used, then multiple Candida species can be detected, but the specificity for C. auris is reduced leading to false positives
Solution Approach 1:
The invention applies local quality by designing detection reagents that target specific local genetic features unique to C. auris. The primers and probes are engineered to recognize particular sequences in the beta-tubulin gene, ITS region, and 5.8S rRNA gene that are distinct from other Candida species, thereby achieving high specificity without sacrificing the ability to detect other organisms through separate targeted assays.
Solution Approach 2:
The invention changes the detection parameters by targeting specific genetic sequences rather than using broad-spectrum cultural or biochemical methods. By adjusting the specificity of the oligonucleotide probes to match unique genetic markers of C. auris, the method achieves high reliability in distinguishing this species from others, reducing false positives while maintaining the capability to identify different organisms through dedicated assays.
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 enables accurate and rapid detection of Candida auris, reducing the risk of misidentification and facilitating timely implementation of infection control precautions in healthcare settings.
Implementation Method 1
performing an amplifying step including contacting the sample with a set of oligonucleotide primers designed to target a specific CA gene to produce an amplification product if CA is present in the sample
Implementation Method 2
performing a hybridizing step including contacting the amplification product with one or more detectable oligonucleotide probes to the target CA gene
Data Source
AI summary
Methods for the rapid detection of the presence or absence of Candida auris (CA) in a biological or non-biological sample are described. The methods can include performing an amplifying step, a hybridizing step, and a detecting step. Furthermore, primers, probes targeting the CA 5.8s/ITS2 rRNA gene, along with kits are provided that are designed for the detection of CA.