RPA-LFD CAEV Detection Kit for Rapid Goat Diagnosis
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Solution Overview
Problem
Current methods for diagnosing caprine arthritis-encephalitis virus (CAEV) infections, such as serological tests, face challenges with delayed sera conversion, antigenic heterogeneity, and high costs associated with antigen preparation, leading to inefficiencies in early and precise diagnosis.
Innovation Solution
A method utilizing recombinase polymerase amplification (RPA) to amplify specific DNA sequences of CAEV, combined with a lateral flow dipstick (LFD) for rapid and sensitive detection, which includes labeled primers and probes for amplicon visualization on a strip with distinct binding agents, allowing for easy interpretation of results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If serological tests (AGID) are used for CAEV diagnosis, then the test can be performed with simple equipment, but the diagnosis is delayed due to delayed sera conversion
Solution Approach 1:
The patent replaces serological tests (which detect antibodies produced by the host immune system) with a direct molecular detection method using RPA-LFD to detect viral DNA. This substitution eliminates the delay caused by waiting for antibody production while maintaining operational simplicity through a direct detection approach that does not depend on host immune response timing.
Solution Approach 2:
The patent performs preliminary amplification of the viral DNA target sequence using RPA before the actual detection. This preliminary action concentrates the viral genetic material, enabling detection even when viral load is low or during early infection stages before antibody conversion occurs, thus resolving the timing issue of delayed diagnosis.
2Measurement precision
If ELISA test is used for CAEV diagnosis, then sensitivity is improved, but cost and time for antigen preparation increase
Solution Approach 1:
The patent extracts and amplifies only the essential viral DNA target sequence (gag segment) using RPA, eliminating the need for complex antigen preparation. By focusing on a specific genomic region rather than requiring purified viral proteins or antigens, the method achieves high sensitivity without the cost and complexity of antigen production and standardization.
Solution Approach 2:
The patent creates multiple copies of the viral DNA target sequence through RPA amplification, generating sufficient material for detection without needing to prepare actual viral antigens. This copying approach replaces the expensive and complex process of isolating and purifying viral proteins, maintaining sensitivity while reducing device complexity and cost.
3Measurement precision
If ELISA test is used for CAEV diagnosis, then detection sensitivity is improved, but antigenic heterogeneity may reduce sensitivity
Solution Approach 1:
The patent segments the viral genome and targets a specific conserved region (gag segment) for detection. By focusing on a particular genomic segment rather than relying on antigenic proteins that may vary between strains, the method achieves consistent detection across different CAEV strains, overcoming the problem of antigenic heterogeneity while maintaining sensitivity.
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 provides a rapid, cost-effective, and highly sensitive method for CAEV detection, capable of identifying the virus in a shorter time frame compared to existing methods, with higher specificity and sensitivity, and can be performed in less-equipped laboratories.
Implementation Method 1
amplifying gag-segment (nt 618-803) DNA of CAEV as a target sequence in the sample by recombinase polymerase amplification (RPA)
Implementation Method 2
applying an amount of the amplification product of step (a) to a lateral flow device/strip to flow laterally towards a distal end of the lateral flow device/strip
Implementation Method 3
one of the primers being labeled with a first label and the probe sequence being labeled with a second label such that amplification of the target sequence generates an amplicon labeled with both first and second labels
Implementation Method 4
said conjugate pad having mobile reporter labeled with a first agent which specifically binds to the first label or the second label of the amplicon
Data Source
AI summary
The invention is to provide a method and kit based on recombinase polymerase amplification (RPA) and lateral flow dipstick (LFD) for detection of caprine arthritis-encephalitis virus (CAEV) infection. The method and kit are suitable for both laboratory and field application, and are specific and sensitive for detecting CAEV proviral DNA in goats in a fast manner. The method and lit of the invention are also applicable for on-site utilization at farms and should be useful in both eradication programs and epidemiological studies.