Chlamydia trachomatis Detection Primers and Probes
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Solution Overview
Problem
Current nucleic acid amplification tests (NAAT) for Chlamydia trachomatis (CT) infections are inadequate in detecting a variant strain with a deletion in the cryptic plasmid, leading to false negatives and inefficiencies in diagnosis, particularly in regions like Sweden where this variant is prevalent.
Innovation Solution
Development of specific polynucleotide reagents, including primers and probes with high sequence identity, designed to detect and differentiate the variant strain (CTSW) from wild-type CT strains, enabling accurate amplification and detection of CT and CTSW strains using PCR-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional NAAT using cryptic plasmid as template is used, then detection of wild-type CT strains is achieved, but detection of variant strain with deletion (CTSW) fails leading to false negatives
Solution Approach 1:
The detection system is segmented into multiple primer-probe combinations, each targeting different regions of the cryptic plasmid. This segmentation allows the system to detect both wild-type strains (with intact plasmid) and variant strains (with deletions), as different segments remain intact in different strain types.
Solution Approach 2:
The patent creates a universal detection system that can identify multiple strain types (wild-type and variant) using a single assay platform. The multi-functional primer-probe set can adapt to detect different genetic configurations within the same species, making the test versatile across strain variations.
2Ease of operation
If serological markers are used for diagnosis, then antibody production detection is achieved, but false positives and false negatives occur reducing diagnostic reliability
Solution Approach 1:
The patent replaces the serological detection mechanism (antibody-antigen interaction) with a nucleic acid amplification mechanism (PCR). This substitution eliminates the limitations of serology such as false positives from cross-reacting species and false negatives from undetectable antibody titers, providing more reliable direct detection of the pathogen's genetic material.
3Reliability
If cell culturing is used for diagnosis, then bacterial growth detection is achieved, but time-consuming procedures and difficulty in growing clinical isolates reduce productivity
Solution Approach 1:
The patent replaces the biological cultivation process with a biochemical amplification process. Instead of waiting for bacteria to grow in culture media (which may take days and fail for difficult isolates), the system directly amplifies and detects bacterial DNA/RNA from clinical samples, dramatically reducing turnaround time while maintaining diagnostic 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 solution provides sensitive, specific, and reproducible detection of both CT and CTSW strains, allowing for simultaneous identification of either or both in clinical samples, improving diagnostic accuracy and reliability.
Implementation Method 1
a first, a second and a third polynucleotide... useful for detecting and/or amplifying CT and CTSW
Data Source
AI summary
The present invention relates to primers and probes that can be used in various assays to detect a new strain of Chlamydia trachomatis. The invention further provides for the simultaneous detection of other diseases, especially Neisseria gonorrhoeae