AAV Stability Characterization by Variable-Temperature CD-MS
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Solution Overview
Problem
Existing methods like differential scanning fluorimetry and calorimetry fail to distinguish the stability of different AAV subpopulations within a sample, limiting the characterization of Adeno-associated viral (AAV) capsids used in gene therapy and vaccine delivery systems.
Innovation Solution
A method combining charge-detection mass spectrometry (CD-MS) with variable-temperature electrospray analysis is employed to differentiate the stability of various forms of AAV particles, including fully assembled, partially filled, and over-filled virions, by detecting and quantifying them based on their mass-to-charge ratios at different temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential scanning fluorimetry or calorimetry are used to measure thermal stability of AAVs, then global stability measurement is achieved, but the ability to distinguish stability of different AAV subpopulations is lost
Solution Approach 1:
The invention segments the AAV sample into distinct subpopulations (empty capsids, partially filled virions, fully filled virions) based on their buoyant density differences. Each subpopulation is separated and analyzed independently to determine their respective thermal stabilities, thereby preserving subpopulation differentiation information while achieving precise stability measurements for each group.
Solution Approach 2:
The invention extracts specific AAV subpopulations from the mixed sample using density gradient centrifugation. By taking out each subpopulation separately based on their unique buoyant densities, the method enables individual stability analysis of each virion type without the information loss that occurs in global measurement approaches.
2Productivity
If global methods are used to measure AAV stability, then overall sample stability is obtained, but differentiation between fully assembled, partially filled, and over-filled virions is impossible
Solution Approach 1:
The method segments AAV virions into distinct types (empty, partially filled, fully filled, over-filled) based on their buoyant density characteristics. This segmentation allows each virion type to be measured separately for thermal stability, achieving precise differentiation while maintaining measurement efficiency through automated density gradient analysis.
Solution Approach 2:
The invention uses buoyant density as an intermediary property to differentiate between various AAV subpopulations. By measuring and separating virions according to their density characteristics, the method enables precise identification and stability measurement of each virion type without requiring complex direct observation techniques.
3Measurement precision
If charge-detection mass spectrometry with variable-temperature electrospray is used, then discrimination of different AAV forms is enhanced, but measurement complexity increases
Solution Approach 1:
The invention segments the AAV sample into distinct subpopulations using density gradient centrifugation before analysis. This pre-segmentation simplifies the subsequent mass spectrometry analysis by reducing the complexity of the sample matrix, allowing for enhanced discrimination of different AAV forms without requiring overly complex measurement systems.
Solution Approach 2:
The invention replaces complex mechanical separation methods with charge-detection mass spectrometry combined with variable-temperature electrospray. This substitution uses electromagnetic fields and thermal energy to achieve precise discrimination of AAV subpopulations, enhancing measurement precision while managing system complexity through the use of well-established spectrometric techniques.
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
This approach provides enhanced discrimination and characterization of AAV stability, enabling the selection of optimal viral clones for gene therapy and vaccine development by identifying and quantifying different viral particle types.
Implementation Method 1
detecting and quantifying them based on their mass-to-charge ratios
Implementation Method 2
variable-temperature electrospray analysis is employed to differentiate the stability of various forms of AAV particles
Data Source
AI summary
A first method of analyzing recombinant viruses is provided. The method comprises infusing a sample of recombinant viruses into a charge-detection mass spectrometer, the spectrometer comprising an electrospray needle that is maintained at a first temperature for a first period of time; detecting a first analyte during the first period of time; maintaining the electrospray needle at a second temperature higher than the first temperature for a second period of time; and detecting the first analyte during the second period of time. A second method of using the first method to compare stability of two or more distinct viral suspensions is also provided.