Protein Chip for Autoantibody Detection via Native Membrane Protein Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current diagnostic methods for detecting autoantibodies associated with neurological disorders, particularly those affecting the nervous system, lack sensitivity and specificity, especially for membrane proteins and protein complexes, and often require large volumes of serum or involve denaturation of proteins, limiting their effectiveness.
Innovation Solution
A protein chip is developed using mammalian cells to express and solubilize membrane proteins in their native conformation, allowing for the detection of autoantibodies without the need for serum dilution and preserving the native structure of proteins, enabling the identification of both sequential and conformational epitopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diagnostic methods (ELISA, RIA, IFA) are used to detect autoantibodies, then the detection process can be performed with existing techniques, but the sensitivity and specificity are insufficient, particularly for membrane proteins and protein complexes
Solution Approach 1:
The patent changes the physical and chemical parameters of the detection system by using a microarray format with multiple copies of membrane proteins immobilized on a solid support. This increases the concentration of target antigens available for binding, thereby improving detection sensitivity and specificity for autoantibodies against membrane proteins and protein complexes
Solution Approach 2:
The patent segments the detection process by creating a microarray with multiple distinct regions, each containing different membrane proteins or protein complexes. This allows simultaneous detection of multiple autoantibodies in a single assay, improving both sensitivity through multiple targets and specificity through pattern recognition of different antibody responses
2Object-affected harmful factors
If serum dilution is performed to reduce background noise in ELISA tests, then background noise is reduced, but the required serum volume increases and sensitivity is compromised
Solution Approach 1:
The patent transitions from a homogeneous liquid-phase ELISA to a spatially organized microarray format. By distributing multiple protein targets across a two-dimensional surface, the system achieves high detection sensitivity without requiring serum dilution, as the localized concentration of antigens at each array position enhances binding efficiency while maintaining low background noise
3Ease of manufacture
If Western blotting or immunohistochemistry techniques are used, then protein detection can be performed, but the proteins are denatured and only non-conformational epitopes are detected
Solution Approach 1:
The patent changes the structural parameters of the membrane proteins by maintaining them in their native conformational state during immobilization on the microarray. This is achieved by using mild cross-linking methods that preserve three-dimensional structure, allowing detection of both conformational and linear epitopes, thereby improving measurement precision for autoantibody detection
Solution Approach 2:
The patent creates a composite structure combining membrane proteins in their native state with a solid support matrix. This composite maintains the functional integrity of the proteins while providing the stability and ease of handling required for diagnostic applications, enabling detection of conformational epitopes that would be lost in denaturing techniques
4Quantity of substance
If large volumes of serum are used in ELISA tests, then more target antibodies may be detected, but background noise increases and unacceptable radioactivity values occur in negative controls
Solution Approach 1:
The patent segments the serum sample application by allowing small volumes to be applied to specific regions of the microarray where concentrated antigen arrays are located. The high local concentration of antigens compensates for the small total serum volume, enabling effective detection while minimizing background noise and false positives that would occur with large-volume conventional ELISA
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 protein chip provides sensitive and specific detection of autoantibodies, even at low concentrations, without the need for serum dilution, and allows for the analysis of large biological samples, improving the diagnosis and monitoring of autoimmune diseases affecting the nervous system.
Implementation Method 1
solubilization of the proteins fused to said tag expressed using a non-denaturing detergent allowing the solubilization of said membrane proteins while preserving their conformation and their ability to bind to a support
Implementation Method 2
enabling the sensitive and specific detection of any antibody present in a biological sample capable of binding to any of the epitopes formed by the protein(s) of interest
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 2D~2F
AI summary
The present invention concerns the field of medicine, in particular research and diagnosis. More specifically, it concerns a new tool for detecting antibodies in a biological sample from a mammal. This tool, which is embodied in the form of a protein chip, can be used for screening new targets of interest involved in the onset of an autoimmune disease, in particular a disease affecting the nervous system of a mammal, and for diagnosing or monitoring the development of such an autoimmune disease. The invention also concerns a method for producing such a tool and the kits comprising said tool and enabling the use thereof.