Charge Detection Mass Spectrometry for AAV Vector Characterization
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Solution Overview
Problem
Current methods for characterizing recombinant adeno-associated virus (AAV) vector preparations are inefficient and lack high-resolution analysis, particularly in distinguishing between full, partial, and empty genome-containing particles, which is crucial for gene therapy applications due to potential immunotoxicity concerns.
Innovation Solution
The use of charge detection mass spectrometry (CDMS) to resolve the mass landscape of AAV vector preparations, allowing for the differentiation of empty, partial, and full genome-packaging virus particles, as well as contaminants, by measuring the charge and mass-to-charge ratio of individual ions, providing a high-resolution profile in a significantly shorter time than traditional methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass spectrometry is used to analyze virus particles, then the analysis can be performed, but the peaks in the m/z spectrum broaden and shift due to mass heterogeneity, preventing charge state assignment and accurate mass deduction
Solution Approach 1:
The patent replaces conventional mass spectrometry measurement methods with a different physical approach. Instead of relying on m/z spectrum analysis that suffers from peak broadening, the invention uses a method that directly measures mass without charge state complications, substituting the measurement mechanism to avoid the fundamental limitation of peak resolution in heterogeneous samples
Solution Approach 2:
The invention changes the measurement parameters from m/z (mass-to-charge ratio) to direct mass measurement. By altering the measured parameter from a ratio that depends on charge state to an absolute mass value, the method eliminates the problem of peak broadening and shifting caused by mass heterogeneity and charge state variations in virus particles
2Measurement precision
If electron microscopy is used to characterize AAV vector preparations, then ultrastructural composition can be visualized, but the method is time consuming, subjective, and requires large datasets to obtain accurate representation
Solution Approach 1:
The patent replaces electron microscopy with a mass-based detection method. Instead of visualizing ultrastructure through imaging that requires subjective interpretation and large datasets, the invention uses mass measurement to directly quantify particle composition, substituting an imaging-based mechanical system with a measurement-based system that provides objective, quantitative data
Solution Approach 2:
The invention creates a mass-based copy or representation of the viral particle composition rather than relying on visual images. By measuring the mass of individual particles and deriving compositional information from mass values, the method creates an alternative representation of particle ultrastructure that is objective and requires minimal data for accurate characterization
3Productivity
If analytical ultracentrifugation is used for AAV characterization, then low-resolution analysis can be obtained, but the resolution is insufficient to distinguish between different particle types
Solution Approach 1:
The patent replaces analytical ultracentrifugation with a direct mass measurement method. Instead of using centrifugal separation that provides only low-resolution size-based classification, the invention uses mass spectrometry to directly measure the mass of individual particles, substituting a separation-based mechanical system with a direct measurement system that provides high-resolution differentiation of particle types
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
CDMS enables rapid and accurate identification of AAV vector components, improving the analysis of vector purity and homogeneity, and providing insights into genome packaging efficiency and thermal-induced disassembly, thereby enhancing the quality control of AAV vector preparations for gene therapy.
Implementation Method 1
The use of charge detection mass spectrometry (CDMS) to resolve the mass landscape of whole virus particles, capsid intermediates, and viral genomes, allowing for the differentiation of empty, partial, and full genome-packaging virus particles, as well as contaminants, by measuring the charge and mass-to-charge ratio of individual ions.
Data Source
AI summary
The present invention provides a method of identifying components present in a preparation of virus particles, comprising: a) analyzing the preparation of virus particles with single molecule mass spectrometry to obtain a mass histogram; and b) interpreting the mass histogram of (a) to identify different components present in the preparation.