Multiplexed Bead Arrays for Proteomics via Mass Spectrometry Encoding
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Solution Overview
Problem
Current bead array technologies lack methods for encoding reactive sites solely by the molecular weights of target analytes that bind to capture agents, particularly for scenarios where a capture agent can bind multiple distinct target analytes, and existing solutions do not provide a means to uniquely identify reactive sites without positional, optical, or mass tag encoding.
Innovation Solution
A bead array with multiple reactive sites, each containing a unique combination of capture agents that bind distinct proteinaceous compounds with specific molecular weights, allowing for the encoding of each site by a combination of molecular weights of bound targets, and a decoding method using mass spectrometry to identify targets based on their molecular weights and corresponding signals in a mass spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional bead array encoding methods (optical labels, fluorescent labels, mass tags) are used, then bead identity can be determined, but device complexity and assay cost increase
Solution Approach 1:
The target analyte itself serves as the encoding element through its intrinsic molecular weight, eliminating the need for external encoding tags. The molecular weight of the bound target analyte directly provides the identification information, making the system self-identifying without additional complexity
Solution Approach 2:
The encoding function is extracted from separate components (optical labels, mass tags) and integrated into the target analyte itself. The molecular weight of the target analyte becomes the identifier, removing the need for additional encoding layers
2Adaptability or versatility
If a capture agent binds multiple distinct target analytes, then binding versatility increases, but identification of specific targets becomes ambiguous
Solution Approach 1:
The identification problem is segmented by analyzing the molecular weight spectrum to detect multiple distinct peaks, each corresponding to a specific target analyte. This allows differentiation of multiple targets bound to the same capture agent through their unique molecular weight signatures
Solution Approach 2:
The system intentionally allows excessive binding (multiple targets to one capture agent) and then uses mass spectrometry to selectively identify which targets are present based on their molecular weights, converting a potential problem into a multiplexing advantage
3Ease of operation
If positional encoding is eliminated in bead arrays, then ease of operation improves, but means of identifying capture agent identity must be added
Solution Approach 1:
The mechanical/positional encoding system is replaced with a spectroscopic identification method. Instead of determining identity by bead position, the system uses mass spectrometry to detect the molecular weight of bound targets, substituting a mechanical identification approach with a spectral one
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 the unambiguous identification of target analytes in bead arrays without the need for positional, optical, or mass tag encoding, allowing for efficient analysis of complex biological samples and increased multiplexing capabilities in analytical assays.
Implementation Method 1
a first capture agent that is associated with the first bead and specifically recognizes a naturally occurring epitope and specifically binds at least two distinct targets that contain such epitope
Implementation Method 2
Each of the first and the second reactive sites is associated with a unique combination that includes at least two distinct values, which are derived from the molecular weights of targets that specifically bind to the corresponding reactive site
Data Source
AI summary
Bead arrays suitable for analysis by mass spectrometry are disclosed. In an embodiment, a bead array includes multiple reactive sites, each of the reactive sites being capable of binding multiple distinct target analytes.