Photochemical Viral Vector Release With Low DNA Contamination
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Solution Overview
Problem
Current methods for purifying viral vectors from production cells are inefficient, scalable, and result in contamination with cellular DNA, posing economic challenges and practical complexities.
Innovation Solution
A photochemical lysis method using photosensitizing agents to disrupt the plasma membrane of production cells, allowing selective release of viral vectors without releasing genomic DNA, followed by optional purification steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical lysis or physical disruption methods are used to release viral vectors from production cells, then the release efficiency is improved, but cellular DNA is released along with the viral vectors causing contamination
Solution Approach 1:
The patent applies local quality by creating pores of specific sizes in the plasma membrane that are large enough to allow viral vectors to escape but small enough to retain genomic DNA. This selective permeabilization is achieved through controlled photochemical treatment that generates pores with dimensions tailored to the size difference between viral vectors and DNA molecules, thus releasing viral vectors while preventing DNA contamination.
Solution Approach 2:
The patent utilizes porous materials by creating a porous structure in the plasma membrane through photochemical pore formation. The membrane transforms from an intact barrier into a controlled porous filter that selectively permits viral vector passage while blocking DNA, effectively using the pore structure as a size-based separation mechanism to achieve both release efficiency and purity.
2Manufacturing precision
If multistep purification processes are used to remove cellular DNA, then the purity of viral vectors is improved, but the process complexity and time consumption increase
Solution Approach 1:
The patent applies the extraction principle by removing the source of DNA contamination at the earliest possible stage - during the release step itself. Instead of allowing DNA to mix with viral vectors and then requiring complex purification to separate them, the method extracts DNA from the system by preventing its release through selective pore formation, thereby eliminating the need for subsequent DNA removal steps and simplifying the overall process.
Solution Approach 2:
The patent employs preliminary action by performing selective permeabilization before the purification stage. The photochemical pore formation is conducted as a preliminary step that pre-separates viral vectors from DNA based on size, creating a purified viral vector preparation before any formal purification process begins. This preliminary separation action eliminates the need for multiple subsequent purification steps.
3Productivity
If conventional lysis methods are used to open production cells, then viral vectors can be released, but the process results in contamination with cellular components and requires extensive purification
Solution Approach 1:
The patent converts the harmful effect of plasma membrane disruption into a beneficial selective release mechanism. Instead of using harsh chemical or mechanical lysis that causes complete membrane breakdown and DNA release, the method uses photochemical treatment to create controlled pores that exploit the size difference between viral vectors and DNA, transforming the membrane disruption from a harmful contaminating event into a beneficial selective separation process.
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
The method achieves efficient and scalable release of viral vectors with minimal DNA contamination, improving yield and purity.
Implementation Method 1
The method uses photochemical treatment as a means to disrupt the plasma membrane of cells in culture, in particular VV production cells, thereby allowing entrapped VVs to be released into solution for subsequent purification. This photochemical treatment is also referred to as photochemical lysis (PCL) herein. In these methods photosensitising agents are used to generate light-induced chemical reactions (mainly mediated by reactive oxygen species (ROS)) that disrupt the membranes of VV production cells.
Data Source
AI summary
The present invention provides a method of releasing viral vectors from cells producing those viral vectors by contacting the cells with a photosensitising agent which is then irradiated to disrupt the plasma membrane of the cells to release the viral vectors which may be collected and/or purified. The product of such methods as well as kits and apparatuses for performing the methods are also provided.