ANV Diagnostic Test Using Conserved 3'UTR Primers
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Solution Overview
Problem
Current diagnostic tests for Avian Nephritis Virus (ANV) face challenges due to limited knowledge of sequence variability, leading to difficulties in detecting and quantifying ANV using RT-PCR, as well as identifying suitable primers, which restricts the identification of antigentically different ANV types and their disease impact.
Innovation Solution
Determination of partial nucleic acid sequences of 20 ANV genomes, elucidating representative sequences for antigenically different types, and utilizing conserved 3'UTR sequences to design primers and probes for enhanced specificity in RT-PCR tests, allowing for improved detection of ANV types beyond ANV-1 and ANV-2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RT-PCR tests are used with limited sequence knowledge, then the test can be performed with existing methods, but the detection capability is restricted to known ANV types (ANV-1 and ANV-2) and cannot detect antigenically different ANV types
Solution Approach 1:
The patent applies preliminary action by conducting extensive sequence analysis of 20 ANV genomes before developing the diagnostic test. This preliminary sequencing and identification of conserved regions (particularly in the 3'UTR) enables the design of primers and probes that can detect multiple ANV types, including antigenically different ones not previously detected by conventional methods
Solution Approach 2:
The patent achieves universality by designing primers and probes based on highly conserved sequences in the 3'UTR region that are common across multiple ANV types. This allows a single diagnostic test to detect various ANV types (ANV-1, ANV-2, and antigenically different types) rather than requiring separate tests for each type
2Measurement precision
If primers are designed based on limited sequence data, then the primer design process is simpler, but the specificity and sensitivity of detection is reduced
Solution Approach 1:
The patent applies parameter changes by shifting the target region for primer design from variable regions to highly conserved regions (3'UTR) of the ANV genome. This parameter change in target selection enables high detection specificity and sensitivity across multiple ANV types, as the conserved sequences provide consistent binding targets regardless of antigenic differences in other regions
3Reliability
If immunostaining-based methods are used with virus specific antisera, then the method can detect specific ANV types, but the antisera do not cross-react with antigenically different ANVs
Solution Approach 1:
The patent replaces the immunological detection mechanism (antisera-antigen binding) with a nucleic acid-based detection mechanism (PCR amplification and hybridization). This substitution eliminates the limitation of antigenic variability that prevents cross-reactivity in immunostaining methods, as nucleic acid sequences in the 3'UTR region are highly conserved across different ANV types, enabling reliable detection through molecular rather than immunological recognition
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 method enables specific and sensitive detection of ANV through enhanced primer specificity and the use of nucleic acid probes, facilitating the identification of antigenically different types and potentially mediating an immune response, thereby improving diagnostic accuracy and vaccine development.
Implementation Method 1
synthesising a first strand of DNA from said isolated RNA using a reverse primer which is complementary to a portion of the 3' untranslated region (UTR) of the virus
Implementation Method 2
amplifying said first strand of DNA to form an amplified product
Implementation Method 3
a method for detecting avian nephritis virus in a sample to be tested comprising the steps: a. isolating total RNA from a sample to be tested, b. synthesising a first strand of DNA from said isolated RNA
Implementation Method 4
detecting the amplified product
Data Source
AI summary
Unique Avian Nephritis Virus (ANV) nucleic acid sequences have been determined. Primers and probes have been developed using the isolated nucleic acid sequences and a reverse transcription PCR has been developed to detect the presence of ANV in commercial flocks. Furthermore, use of the nucleic acid sequences and amino acids sequences encoded therefrom and antibodies to said amino acids is discussed.