Oligonucleotide Probes for E. coli O157:H7 and O145:H28 Detection
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Solution Overview
Problem
Current methods for detecting Escherichia coli serotypes O157:H7 and O145:H28 are not specific or sensitive enough, requiring enrichment and lacking simplicity, which is a public health and economic concern due to their association with foodborne illnesses.
Innovation Solution
The use of newly identified sequence regions with high sequence identity between O157:H7 and O145:H28, along with specific oligonucleotides that can distinguish between these serotypes, allows for selective detection without enrichment, using PCR or other amplification methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used, then detection can be performed, but specificity and sensitivity are insufficient and enrichment is required
Solution Approach 1:
The invention segments the detection approach by using multiple specific oligonucleotide probes targeting different genomic regions of E. coli O157:H7 and O145:H28. This segmentation allows the detection system to achieve high specificity and sensitivity without requiring complex enrichment processes, as each probe independently targets unique sequence regions of the pathogenic serotypes.
Solution Approach 2:
The invention changes the detection parameters by using highly specific oligonucleotide sequences with unique genomic targets rather than broad-spectrum detection markers. This parameter change enables direct detection of low bacterial loads without enrichment, improving both sensitivity and specificity while simplifying the overall detection workflow.
2Measurement precision
If enrichment is performed to improve detection sensitivity, then low bacterial loads can be detected, but time and processing steps are increased
Solution Approach 1:
The invention performs preliminary action by designing oligonucleotide probes that target highly conserved and abundant genomic regions of E. coli O157:H7 and O145:H28. This preliminary design enables the detection system to achieve sufficient sensitivity directly from food samples without requiring time-consuming enrichment steps, thereby reducing total detection time while maintaining high sensitivity.
3Adaptability or versatility
If broad-spectrum detection is used, then various E. coli serotypes can be detected, but specificity for O157:H7 and O145:H28 is reduced
Solution Approach 1:
The invention applies local quality by using oligonucleotide probes that target specific local genomic regions unique to E. coli O157:H7 and O145:H28. Each probe is designed to hybridize to particular sequence regions that are present in the pathogenic serotypes but absent or different in other E. coli serotypes, thereby achieving high serotype specificity while maintaining the ability to detect both O157:H7 and O145:H28 through a coordinated probe set.
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 approach enables highly specific and sensitive detection of O157:H7 and O145:H28 in samples, even with low DNA copies, without the need for enrichment, improving public health and economic outcomes by ensuring food safety.
Implementation Method 1
The methods are based on the detection of newly identified sequence regions, which have a very high sequence identity between E. coli serotypes O157:H7 and O145:H28
Implementation Method 2
using PCR or other amplification methods
Data Source
AI summary
The present invention relates to methods and kits for the specific detection of Escherichia coli (E. coli) serotypes O157:H7 and/or O145:H28. The methods and kits are based on the detection of newly identified sequence regions, which have a very high sequence identity between E. coli serotypes O157:H7 and O145:H28 and which are not present in any other known E. coli serotype or bacteria. This sequence region thus allows for selective detection of E. coli O157:1-17 and/or O145:H28 from other bacteria, especially other E. coli serotypes. Furthermore the present invention shows that a 3 bp InDel sequence in O157:H7 allows for distinguishing between O157:H7 and O145:H28, which allows for selective detection of O157:H7 over O145:H28 and vice versa. Furthermore, the invention provides oligonucleotides useful for said detection.