NEAR Isothermal Amplification for Rapid Streptococcus Detection
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Solution Overview
Problem
Current methods for diagnosing Streptococcus pyogenes infections, such as culturing throat swab samples, are slow and do not provide timely results, leading to potential life-threatening complications due to delayed antibiotic treatment.
Innovation Solution
The use of Nicking and Extension Amplification Reaction (NEAR) for isothermal nucleic acid amplification, which involves specific templates and probes complementary to the S. pyogenes cepA gene sequence, allowing for rapid detection of S. pyogenes nucleic acid in biological samples without the need for temperature cycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional culturing methods are used to diagnose S. pyogenes, then accurate detection is achieved, but diagnostic time is excessively long (2-3 days)
Solution Approach 1:
The patent changes the fundamental parameter of the detection process by using isothermal nucleic acid amplification (NEAR) instead of traditional bacterial culturing. This shifts the detection target from whole bacteria to specific nucleic acid sequences, enabling rapid amplification and detection within minutes while maintaining high accuracy through sequence-specific primers and probes.
Solution Approach 2:
The patent replaces the mechanical/biological process of bacterial culturing with a molecular biology-based nucleic acid amplification system. The NEAR reaction uses enzymatic processes (nicking enzymes and DNA polymerase) to amplify target sequences in vitro, substituting the slow biological growth process with a controlled biochemical reaction that completes in minutes.
2Speed
If biochemical detection methods are used, then speed is improved, but sensitivity is insufficient for point-of-care testing
Solution Approach 1:
The patent incorporates preliminary amplification of the target nucleic acid sequence before detection. The NEAR reaction pre-amplifies the S. pyogenes-specific sequences to high concentrations, ensuring that even trace amounts of bacterial DNA in clinical samples are sufficient for sensitive detection. This preliminary amplification step enables both rapid and sensitive detection suitable for point-of-care settings.
Solution Approach 2:
The patent uses specific oligonucleotide primers and probes as intermediaries to detect S. pyogenes. These sequence-specific molecules bind to target DNA regions, providing highly specific and sensitive detection. The intermediaries enable discrimination between S. pyogenes and other bacteria, achieving the required sensitivity for point-of-care diagnostics.
3Loss of time
If rapid detection methods are implemented, then diagnostic time is reduced, but complexity of the testing system increases
Solution Approach 1:
The patent designs the NEAR reaction to be self-contained and self-amplifying. The reaction mix includes all necessary components (templates, nicking enzymes, DNA polymerase, nucleotides, and detection probes) that automatically amplify and detect the target sequence without requiring complex external equipment or multiple processing steps. This self-service approach reduces system complexity while achieving rapid detection.
Solution Approach 2:
The patent combines amplification and detection functions into a single integrated NEAR reaction system. The amplification products are directly detected using fluorescence probes or other detection methods within the same reaction mixture, eliminating the need for separate amplification and detection steps. This merging of functions simplifies the overall testing system while maintaining rapid diagnostic capability.
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 enables rapid and sensitive detection of S. pyogenes, reducing diagnostic time from days to minutes, facilitating point-of-care testing and improving patient outcomes by providing timely antibiotic treatment.
Implementation Method 1
a nicking enzyme binding site and a nicking site upstream of said recognition region
Implementation Method 2
Nicking and Extension Amplification Reaction (NEAR) to detect Streptococcus pyogenes
Implementation Method 3
a recognition region at the 3' end that is complementary to the 3' end of the S. pyogenes target nucleic acid sequence
Data Source
AI summary
This invention relates to compositions, methods and kits for detecting the presence or absence of a bacterial species in a biological sample using isothermal nucleic acid amplification.