AAV Vector Heat Inactivation Buffer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods of heat inactivation for helper viruses during AAV vector production often result in the destruction or degradation of AAV vector genomes, particularly for larger genomes, leading to reduced quality and quantity of recovered AAV vectors.
Innovation Solution
The method involves heating a sample containing both AAV and helper virus particles in the presence of a buffer with kosmotropic salts or divalent/trivalent cations to selectively inactivate the helper virus while preserving AAV integrity, using temperatures between 45°C and 65°C and varying heating times, with specific conditions optimizing the preservation of AAV particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat inactivation is applied to helper virus particles, then helper virus is inactivated, but AAV vector genome is destroyed or degraded
Solution Approach 1:
The patent applies parameter changes by modifying the chemical environment (adding kosmotropic salts or divalent/trivalent cations) during heat inactivation to selectively protect AAV vectors while inactivating helper viruses. This changes the thermal stability parameters of the viral particles in the sample.
Solution Approach 2:
The patent uses kosmotropic salts or divalent/trivalent cations as intermediary substances that mediate the heat inactivation process. These intermediaries bind to helper virus particles and stabilize them against thermal degradation, while having minimal effect on AAV vector particles, thus enabling selective inactivation.
2Reliability
If higher temperature is used for heat inactivation, then helper virus inactivation is enhanced, but AAV vector degradation is increased
Solution Approach 1:
The patent introduces kosmotropic salts or divalent/trivalent cations as intermediary substances that protect AAV vectors from thermal degradation during high-temperature inactivation of helper viruses. These intermediaries act as thermal shields that allow higher temperatures to be used without compromising AAV vector integrity.
Solution Approach 2:
The patent changes the chemical parameters of the buffer system by adding kosmotropic salts or metal cations, which modifies the thermal stability landscape. This allows the system to withstand higher temperatures during inactivation while preserving AAV vector integrity, thus enhancing inactivation efficiency without proportional loss of vector recovery.
3Reliability
If longer heating time is applied, then helper virus inactivation is improved, but AAV vector integrity is compromised
Solution Approach 1:
The patent uses kosmotropic salts or divalent/trivalent cations as protective intermediaries that shield AAV vector particles from prolonged thermal exposure. These intermediaries stabilize the AAV vector structure during extended heating periods, allowing complete helper virus inactivation without compromising AAV vector genome stability.
Solution Approach 2:
The patent modifies the buffer chemistry by incorporating kosmotropic salts or metal cations, which changes the thermal protection parameters. This chemical modification allows longer heating times to be applied for complete helper virus inactivation while the modified buffer environment protects AAV vectors from thermal damage.
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 achieves a significant log reduction of helper virus while maintaining the genomic integrity and biological activity of AAV particles, as demonstrated by increased recovery rates and stability of AAV vectors with intact genomes.
Implementation Method 1
The buffer includes a concentration of 10 mM or greater kosmotropic salts and/or a concentration of 10 mM or greater of divalent or trivalent cations
Implementation Method 2
heating, to a temperature greater than or equal to 45° C. a sample containing helper virus particles, AAV particles, and a buffer
Implementation Method 3
heating, to a temperature greater than or equal to 45° C. a sample containing helper virus particles
Data Source
AI summary
The present disclosure generally relates to methods of protecting the genomic integrity and/or biological activity of AAV viral particles in a sample containing both AAV particles and helper virus particles during heat inactivation. The methods include heating, to a temperature greater than or equal to 45° C., a sample containing helper virus particles, AAV particles, and a buffer. The buffer includes a concentration of 10 mM or greater kosmotropic salts and/or a concentration of 10 mM or greater of divalent or trivalent cations.