dnaK Primer Composition for Low-Copy Chlamydia Detection
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Solution Overview
Problem
Current diagnostic methods for Chlamydia trachomatis are costly, require specialized equipment, and are not suitable for point-of-care testing, with existing LAMP methods lacking sensitivity and specificity, especially for detecting low levels of bacteria.
Innovation Solution
A set of primers specific to the Chlamydia trachomatis dnaK gene is used in an isothermal LAMP method, combined with a fluorescent dye, allowing for rapid and sensitive detection of as few as 5 copies of the bacteria in a reaction mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Real-Time PCR-based assays are used for detecting Chlamydia trachomatis, then detection sensitivity and specificity are improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the complex thermal cycling mechanical system of Real-Time PCR with a simplified isothermal LAMP system that operates at constant temperature (65°C), eliminating the need for sophisticated heating/cooling mechanisms while maintaining high detection sensitivity through optimized primer design and fluorescent detection
2Measurement precision
If Real-Time PCR-based assays are used for detecting Chlamydia trachomatis, then detection sensitivity and specificity are improved, but cost increases
Solution Approach 1:
The patent employs disposable, pre-packaged LAMP reaction mixes containing all necessary reagents (primers, nucleotides, buffer, fluorescent dye) in single-use tubes, eliminating the need for expensive reusable thermal cyclers and complex sample preparation equipment, thereby significantly reducing per-test cost while maintaining high sensitivity
3Device complexity
If isothermal LAMP method is used for detecting Chlamydia trachomatis, then device complexity is reduced, but detection sensitivity decreases
Solution Approach 1:
The patent optimizes critical parameters of the isothermal LAMP reaction including primer concentrations (F3: 0.4 μM, B3: 0.4 μM, FIP: 1.6 μM, BIP: 1.6 μM), Mg2+ concentration (20 mM), dNTP concentration (1.6 mM each), and reaction temperature (65°C) to maximize amplification efficiency and detection sensitivity, achieving comparable performance to Real-Time PCR despite simplified equipment requirements
4Ease of manufacture
If traditional microbiological methods are used for detecting Chlamydia trachomatis, then equipment cost is reduced, but detection sensitivity and speed decrease
Solution Approach 1:
The patent performs preliminary DNA amplification of the target sequence using isothermal LAMP reaction before detection, generating sufficient amplification product during the reaction itself that can be directly detected by simple fluorescent measurement or electrophoresis, eliminating the need for time-consuming cell culture procedures while requiring minimal equipment
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 quick, cost-effective, and sensitive detection of Chlamydia trachomatis at the point of care, with reduced equipment needs and the ability to quantify bacterial levels, suitable for primary care units.
Implementation Method 1
The amplification products are detected using a fluorescent dye, capable of interacting with double-stranded DNA
Data Source
AI summary
The first subject of the invention is a set of primers for amplifying the nucleotide sequence of the Chlamydia trachomatis bacterium dnaK gene. The second subject of the invention is a method for detecting Chlamydia trachomatis bacteria. Another subject of the invention is a method of detecting an infection caused by the Chlamydia trachomatis bacterium. The fourth subject of the invention is a kit for detecting an infection caused by the Chlamydia trachomatis bacterium.