T7-Pep Phage Library for Antibody Detection
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Solution Overview
Problem
Traditional phage display systems lack sensitivity and accuracy in detecting antigenic variations, particularly for viral antigens, due to skewed representation of cDNAs and low expression efficiency, making it challenging to identify autoantibody targets and antiviral responses effectively.
Innovation Solution
A proteomic technology combining a T7-Pep phage library with high-throughput DNA sequencing to uniformly express peptide libraries, including a comprehensive set of human and viral peptides, allowing for precise and accurate detection of antiviral antibody responses and identification of cross-reactive epitopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional phage display systems are used to detect viral antigens, then the system can identify antibody responses, but the sensitivity and accuracy are insufficient due to skewed cDNA representation and low expression efficiency
Solution Approach 1:
The patent changes the fundamental parameters of the phage display system by using synthetic peptide libraries with controlled sequences and lengths (e.g., 15-20 amino acids) instead of random cDNA fragments. This standardization ensures uniform expression levels and eliminates the skewed representation problem, directly improving both detection accuracy and expression efficiency
Solution Approach 2:
The patent creates accurate copies of viral epitopes through synthetic peptide sequences that are designed to match known viral antigen structures. These synthetic copies are then displayed on phage surfaces, providing reliable and reproducible antigen representations that improve detection precision while maintaining consistent expression across the library
2Ease of manufacture
If fragmented cDNA libraries are used in phage display, then the system can be constructed, but the representation is highly skewed with only a small fraction of clones expressing in the correct reading frame
Solution Approach 1:
The patent changes from using fragmented cDNA (variable length, variable composition) to synthetic peptides with controlled parameters (standardized length of 15-20 amino acids, defined sequences). This ensures that nearly all clones in the library can be expressed correctly, eliminating the reading frame problem while maintaining ease of library construction through synthetic biology methods
Solution Approach 2:
The patent creates a universal peptide display system where standardized peptide sequences can be displayed on different phage types and used across multiple detection applications. This universal approach eliminates the need for application-specific library construction while maintaining high expression accuracy across all clones
3Reliability
If full-length folded proteins are used as antigens, then native epitopes are preserved, but detection sensitivity decreases compared to shorter peptides
Solution Approach 1:
The patent segments full-length viral proteins into smaller peptide fragments (15-20 amino acids) that correspond to specific epitopic regions. This segmentation allows the library to focus on the most immunogenic portions of viral proteins, improving detection sensitivity while maintaining epitope authenticity through targeted selection of known antigenic sequences
Solution Approach 2:
The patent applies local quality by concentrating the peptide library on specific high-value epitopic regions of viral proteins rather than uniformly distributing peptides across entire protein sequences. This ensures that the most immunologically relevant regions are over-represented, improving detection sensitivity for clinically important antigens while maintaining biological authenticity
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
Enables simultaneous detection of antiviral antibody responses across virtually all known viruses infecting humans, improving diagnostic capabilities and vaccine design by providing a systematic approach to identify viral causes of disease and autoimmune epitopes with high precision and speed.
Implementation Method 1
contacting a reaction sample comprising a display library with a biological sample comprising antibodies, wherein the display library comprises a plurality of peptides derived from a plurality of pathogens
Implementation Method 2
detecting a peptide bound to at least one antibody, thereby detecting an antibody capable of binding the peptide
Implementation Method 3
By combining T7-Pep phage library with high-throughput DNA sequencing
Data Source
AI summary
Provided herein are methods of detecting an antibody directed against a pathogen and uses thereof.