Oligonucleotide Probe Detection of Chlamydia Trachomatis Variants
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Recent genetic variants of Chlamydia trachomatis have evolved to evade detection in nucleic acid-based diagnostic assays, particularly targeting ribosomal nucleic acids, which are traditionally stable due to their structure-function relationship, making it difficult to differentiate between wildtype and variant sequences.
Innovation Solution
Development of a probe reagent comprising oligonucleotide probes with specific sequences and labels that can hybridize to both wildtype and variant C. trachomatis nucleic acids, including those with substitutions, allowing for accurate detection using chemiluminescent labels like acridinium ester, and a kit that includes these probes for reliable identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ribosomal nucleic acid targets are used in diagnostic assays, then detection reliability is maintained through evolutionary stability, but variant C. trachomatis strains can escape detection due to sequence mutations
Solution Approach 1:
The probe sequence is divided into multiple segments, with at least one segment containing a mismatch with the variant sequence. This segmentation allows the probe to maintain overall hybridization capability while the mismatched segment specifically targets and detects variant sequences that would escape conventional probes
Solution Approach 2:
The probe is designed with non-uniform properties along its length - certain regions have perfect complementarity to the target while other regions contain deliberate mismatches. This local variation in sequence quality enables simultaneous detection of both wildtype and variant sequences with a single probe
2Measurement precision
If probe sequence is made highly specific to wildtype sequence, then wildtype detection precision is improved, but variant detection capability is lost
Solution Approach 1:
The probe design incorporates dynamic mismatch positioning where the mismatch can be located at different positions (5', 3', or central regions) depending on the specific variant being targeted. This dynamic adaptation allows the same probe structure to maintain precision for wildtype while gaining versatility for variant detection
Solution Approach 2:
The probe sequence parameters are modified by introducing controlled mismatches at specific positions. This parameter change transforms the probe from a wildtype-specific detector to a dual-capability detector that can distinguish between wildtype and variant sequences based on hybridization efficiency differences
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 enables effective detection of both wildtype and variant C. trachomatis nucleic acids, improving diagnostic accuracy and specificity, even in cases where traditional assays fail to distinguish between them.
Implementation Method 1
The label can produce a detectable signal if the first oligonucleotide probe hybridizes to a wildtype C. trachomatis nucleic acid sequence
Implementation Method 2
In some embodiments, the label of the first oligonucleotide probe includes a chemiluminescent label. In some embodiments, the chemiluminescent label is an acridinium ester
Data Source
AI summary
Hybridization probe reagents that specifically detect nucleic acids of C. trachomatis, including wildtype and/or variant sequences identified as FI-nvCT C1515T (SEQ ID NO: 17), JP-nvCT C1522T (SEQ ID NO: 12), US-nvCT G1526A (SEQ ID NO:22), and NO-nvCT G1523A (SEQ ID NO:27). Certain probes include nucleotide analogs to enhance desirable binding properties.