Multiplexed Lysosomal Enzyme Assay via Mass Spectrometry
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Solution Overview
Problem
Current methods for newborn screening of mucopolysaccharidoses lack a fast, inexpensive, and reliable diagnostic procedure using dried blood spots, which is essential for early detection and treatment initiation before irreversible symptoms occur.
Innovation Solution
A method involving a solution with nine lysosomal enzymes, including α-glucosidase, α-galactosidase, and others, using specific substrates, metal cations, inhibitors, and surfactants, followed by mass spectrometric analysis to determine enzyme product quantities, allowing for multiplexed enzyme analysis in dried blood spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional separate enzyme assays are used for each lysosomal enzyme, then measurement precision for individual enzymes is maintained, but productivity and time consumption worsen due to multiple separate tests
Solution Approach 1:
The patent combines multiple separate enzyme assays into a single multiplexed assay that simultaneously measures nine different lysosomal enzymes (including α-glucosidase, α-galactosidase, β-glucocerebrosidase, and others) in one reaction well using dried blood spots, thereby increasing productivity and reducing time loss
Solution Approach 2:
The invention creates a universal assay platform that can analyze multiple different lysosomal enzymes using a common protocol, reagent system, and detection method, allowing the same system to perform multiple functions rather than requiring separate specialized assays for each enzyme
2Reliability
If complex diagnostic procedures are developed for early detection, then measurement precision and reliability improve, but device complexity and cost increase
Solution Approach 1:
The assay utilizes dried blood spots that require minimal preparation and processing, allowing the sample to essentially serve itself through the assay protocol without complex sample preparation steps, thereby maintaining reliability while reducing procedural complexity
Solution Approach 2:
The invention changes the physical state parameter of the blood sample from liquid to dried spot form, which simplifies handling, storage, and processing while maintaining enzyme activity detection capability, thus improving reliability without increasing complexity
3Productivity
If multiple enzymes are analyzed simultaneously in a single assay, then productivity improves, but measurement precision may worsen due to potential interference between enzymes
Solution Approach 1:
The patent employs enzyme-specific substrates for each of the nine lysosomal enzymes being assayed, ensuring that each enzyme reacts only with its specific substrate to produce a unique detectable signal, thereby maintaining measurement precision for each individual enzyme even while analyzing multiple enzymes simultaneously in the same reaction well
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 and accurate assessment of multiple lysosomal enzyme activities in a single assay, facilitating early detection of mucopolysaccharidoses and guiding timely treatment.
Implementation Method 1
a metal cation effective for precipitating sulfate ions
Implementation Method 2
determining the quantities of the enzyme products comprises determining the ratio of each product to its internal standard by mass spectrometric analysis
Data Source
Figure 1A~1D
Figure 1E~1I
Figure 2a~3
AI summary
Multiplex enzyme assay methods and compositions for simultaneously assaying the activities of a plurality of lysosomal enzymes.