Circular Epitope Peptides for Specific AQP5 Autoantibody Detection
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Solution Overview
Problem
Current methods for diagnosing Sjogren's syndrome using anti-AQP5 autoantibodies have low specificity due to the detection of all autoantibodies, regardless of their functional impact, leading to false positives in healthy subjects, and do not effectively address the underlying cause of salivary and lacrimal gland dysfunction.
Innovation Solution
Development of specific epitopes, such as GCSMNPARSFGC, CMNPARSFGC, CWPSALPTC, and CNNNTTQGC, which can form circular structures, for detecting AQP5 autoantibodies that inhibit the function of aquaporin 5, allowing for targeted detection and potential therapeutic use by neutralizing these autoantibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If full-length AQP5 is used as an antigen for detection, then all anti-AQP5 autoantibodies are detected, but specificity is very low with 32% false positives in healthy subjects
Solution Approach 1:
The full-length AQP5 protein is divided into multiple epitope peptides (SEQ ID NO: 1-6) corresponding to specific functional regions. This segmentation allows detection to focus on functionally relevant autoantibodies rather than all autoantibodies, thereby improving specificity while maintaining detection coverage
Solution Approach 2:
Different epitope peptides are assigned to detect different functional regions of AQP5. By using multiple specific epitopes rather than a single full-length antigen, the detection system achieves higher local quality in terms of specificity for functionally impactful autoantibodies
2Ease of operation
If current diagnostic criteria are used, then diagnosis can be performed, but diagnostic factors related to disease activity and cause of gland dysfunction are not provided
Solution Approach 1:
Epitope-specific autoantibody detection serves as an intermediary that provides deeper mechanistic information. By detecting which specific epitopes are targeted, the system reveals information about disease activity and pathogenic mechanisms that standard diagnostic criteria cannot provide
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 epitopes significantly improve specificity in detecting functional AQP5 autoantibodies, reducing false positives in healthy subjects and effectively reversing the inhibitory effects on tear and saliva secretion, offering a therapeutic benefit for Sjogren's syndrome treatment.
Implementation Method 1
The present polypeptides specifically recognize anti-AQP5 autoantibodies
Implementation Method 2
the polypeptide or epitopes with SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 5, and SEQ ID NO: 6 may form a circular structure by binding between the cysteine residues included in each sequence
Data Source
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AI summary
Disclosed are: an epitope, which is an epitope of aquaporin 5 (AQP5) and specifically recognizes an anti-aquaporin 5 (AQP5) autoantibody; and a use thereof. An epitope disclosed in the present application can detect an anti-aquaporin 5 autoantibody that inhibits the function of aquaporin 5, can be used as a major diagnostic marker reflecting Sjogren's syndrome disease activity, and removes/neutralizes an anti-AQP5 antibody to reverse the AQP5 function-inhibiting effect of the autoantibody, and thus can be usefully used as a therapeutic agent.