Real-time PCR Detection of Trichomonas vaginalis
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Solution Overview
Problem
Current methods for detecting Trichomonas vaginalis, such as culture and microscopic examination, are not sufficiently sensitive and reliable, particularly for asymptomatic cases, leading to challenges in early detection and prevention of associated complications like HIV acquisition and adverse pregnancy outcomes.
Innovation Solution
A real-time polymerase chain reaction (PCR) method using specific primers and probes targeting the 5.8s ribosomal RNA gene of Trichomonas vaginalis, allowing for rapid and accurate detection in a single test tube, with the potential to differentiate it from closely related species like Trichomonas tenax and Pentatrichomonas hominis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If culture method is used for detection, then reliability is improved, but sensitivity deteriorates (38-82% sensitivity compared to molecular methods)
Solution Approach 1:
The patent replaces the mechanical/cultural system of traditional culture methods with a molecular amplification system (PCR). By using nucleic acid amplification technology, the method achieves both high sensitivity (comparable to or exceeding molecular methods) and high reliability (specific detection of T. vaginalis), resolving the contradiction between reliability and sensitivity that plagues traditional culture methods.
2Ease of operation
If wet-mount microscopic examination is used, then ease of operation is improved, but sensitivity deteriorates (35-80% sensitivity compared with culture)
Solution Approach 1:
The patent replaces the optical/mechanical system of microscopic examination with a molecular amplification and detection system. The real-time PCR method maintains ease of operation through automated cycling and fluorescent detection, while dramatically improving sensitivity by amplifying specific nucleic acid sequences, thus resolving the contradiction between ease of operation and sensitivity.
3Ease of operation
If wet-mount method is used, then ease of operation is improved, but reliability deteriorates due to dependency on microscopist experience and specimen transport time
Solution Approach 1:
The patent replaces the human-dependent optical examination system with an automated molecular amplification and fluorescent detection system. The real-time PCR process is standardized and automated, eliminating variability due to microscopist experience and specimen transport time, thereby improving reliability while maintaining ease of operation through a straightforward protocol.
4Measurement precision
If real-time PCR method is used, then sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single real-time PCR system: nucleic acid amplification, fluorescent probe hybridization, and signal detection all occur in the same reaction tube without requiring separate steps for each function. This integration reduces the overall complexity of the detection system while maintaining high sensitivity, as the amplification and detection processes are merged into one automated workflow.
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 enhanced sensitivity and specificity for detecting Trichomonas vaginalis, enabling early identification and potentially reducing the transmission of associated infections, including HIV, and improving pregnancy outcomes by facilitating timely intervention.
Implementation Method 1
performing an amplifying step including contacting the sample with a set of primers designed to target a specific TV gene to produce an amplification product if TV is present in the sample
Implementation Method 2
performing a hybridizing step including contacting the amplification product with one or more detectable probes to the target TV gene
Data Source
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AI summary
Methods for the rapid detection of the presence or absence of Trichomonas vaginalis (TV) 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 target TV gene, along with kits are provided that are designed for the detection of TV.