Recombinant Cynomolgus Monkey TPO Immunoassay for Thyroid Disease Diagnosis
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Solution Overview
Problem
Current immunoassays for detecting anti-thyroid peroxidase antibodies rely on human-derived TPO, which is costly, difficult to purify, and varies significantly from lot to lot, requiring multiple non-human secondary antibodies.
Innovation Solution
The use of recombinant cynomolgus monkey thyroid peroxidase (rTPO) with specific amino acid sequences, linked to solid supports, to form complexes with anti-thyroid peroxidase antibodies for detection, employing various immunoassay formats such as antigen bridge, IgG class capture, and competition/inhibition assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If human-derived TPO is used in immunoassays, then the assay can detect anti-thyroid peroxidase antibodies, but the method becomes costly, difficult to purify, and variable from lot to lot
Solution Approach 1:
The patent uses recombinant cynomolgus monkey TPO (rTPO) as a copy of human TPO that retains the essential epitopes for antibody detection while eliminating the manufacturing and purification problems associated with human-derived TPO. The rTPO is produced using baculovirus expression systems in insect cells, providing consistent, scalable production without lot-to-lot variability.
Solution Approach 2:
The patent changes the source organism parameter from human to cynomolgus monkey, and the production method from tissue extraction to recombinant protein expression. This parameter change maintains the functional capability for antibody detection while fundamentally improving manufacturability and consistency.
2Reliability
If human-derived TPO is used, then anti-TPO antibodies can be detected, but multiple non-human secondary antibodies are required
Solution Approach 1:
By using cynomolgus monkey TPO as the antigen, the patent enables the use of monkey-derived secondary antibodies that recognize the TPO epitopes. This eliminates the need for multiple non-human secondary antibodies and simplifies the assay system while maintaining detection capability.
3Ease of manufacture
If recombinant cynomolgus monkey TPO is used, then cost and variability are reduced, but the assay format complexity increases
Solution Approach 1:
The patent demonstrates that the recombinant cynomolgus monkey TPO can be used across multiple immunoassay formats including sandwich ELISA, competition ELISA, and immunoprecipitation assays. This multi-functionality allows the same rTPO platform to serve various detection purposes, reducing overall system complexity despite the advanced nature of the recombinant protein.
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
Provides a cost-effective, reliable, and consistent method for diagnosing thyroid diseases by detecting anti-thyroid peroxidase antibodies, offering high sensitivity and specificity with reduced variability.
Implementation Method 1
In the presence of the anti-thyroid peroxidase antibody, a complex comprising the labeled cynomolgus monkey rTPO, the anti-thyroid peroxidase antibody and the unlabeled cynomolgus monkey rTPO, and the solid support is formed
Data Source
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AI summary
Disclosed herein are immunoassays for detecting an anti-thyroid peroxidase antibody in a biological sample from a subject and/or diagnosing a thyroid disease in a subject. The disclosed immunoassays employ a recombinant cynomolgus monkey thyroid peroxidase (rTPO) and assess the level of anti-thyroid peroxidase antibody-induced formation or disruption of complexes comprising a solid support and the rTPO.