NS1 Wing Domain Polypeptide for Flavivirus Antibody Detection
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Solution Overview
Problem
Current immunoassays for detecting flavivirus antibodies, such as those for Zika, Dengue, and West Nile viruses, suffer from limited specificity due to cross-reactivity with antibodies raised against related viruses, leading to false positive results and inaccurate diagnosis.
Innovation Solution
Development of a polypeptide specific to the NS1 wing domain of flaviviruses, excluding the β-ladder domain, which is used to create a soluble and stable antigen for detecting specific antibodies, reducing cross-reactivity and enabling precise diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full-length NS1 antigen is used for detecting flavivirus antibodies, then the assay has high sensitivity, but the specificity is limited due to cross-reactivity with antibodies against related viruses
Solution Approach 1:
The NS1 antigen is divided into distinct functional domains: the wing domain (amino acids 1-190) and the beta-ladder domain (amino acids 191-352). By using only the wing domain in the diagnostic assay, the patent achieves specific detection of flavivirus antibodies while avoiding cross-reactivity with antibodies against other flaviviruses that target the beta-ladder domain.
Solution Approach 2:
The patent extracts and isolates only the wing domain portion of the NS1 antigen for use in the diagnostic assay. This extracted domain specifically binds to antibodies against Zika virus, Dengue virus, and other flaviviruses without binding to antibodies against other flaviviruses, thereby eliminating false positives while maintaining diagnostic sensitivity.
2Measurement precision
If full-length NS1 antigen is used, then comprehensive antibody detection is achieved, but cross-reactivity with antibodies from other flaviviruses causes false positives
Solution Approach 1:
The NS1 antigen is segmented into two functional domains, and only the wing domain is utilized in the assay. This segmentation allows the diagnostic to achieve high diagnostic accuracy by specifically detecting antibodies against the target flavivirus while the excluded beta-ladder domain prevents cross-reactivity with antibodies from other flaviviruses.
Solution Approach 2:
The patent applies local quality by making the antigen composition specific to the detection target. The wing domain is used when detection of Zika, Dengue, or other flavivirus antibodies is required, while the beta-ladder domain is excluded to prevent cross-reactivity. This localized selection of antigen components optimizes the assay for specific diagnostic purposes.
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 NS1 wing domain-specific polypeptide achieves superior specificity in detecting antibodies, effectively distinguishing between Zika, Dengue, and West Nile viruses, even in the presence of antibodies from other flaviviruses, thereby improving diagnostic accuracy and reducing false positives.
Implementation Method 1
The isolated biological sample is incubated with a flavivirus NS1 wing domain-specific polypeptide under conditions allowing binding of flavivirus-specific antibodies present in the sample to the polypeptide
Data Source
AI summary
The disclosure relates to a polypeptide suitable for detecting antibodies against a flavivirus in an isolated biological sample having a flavivirus NS1 wing domain specific amino acid sequence, wherein no amino acid sequences from the NS1 β-ladder domain of said flavivirus are present in the polypeptide. In an embodiment, the flavivirus is selected from Zika virus (ZIKV), West-Nile virus (WNV), Dengue virus types 1-4 (DENV1-4), tick-borne encephalitis virus (TBEV), yellow fever virus (YFV) and Japanese encephalitis virus (JEV). Also disclosed is a method for producing said flaviviral NS1 wing domain specific polypeptides, a method for detecting antibodies specific for a first flavivirus species, the use of said flaviviral NS1 wing domain specific polypeptides for detecting antibodies as well as a reagent kit for detecting said flavivirus antibodies that has a flavivirus NS1 wing domain polypeptide.