Modified Batch AAV Production with Perfusion for High-Density Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing AAV manufacturing technologies face challenges in achieving high-yielding, scalable, and cost-efficient processes to meet clinical and therapeutic needs, with batch mode increases in cell density leading to significant yield decreases and high production costs.
Innovation Solution
Implementing perfusion-based systems and methods in AAV production, allowing for continuous nutrient supplementation and waste removal, which maintain high cell density and increase AAV productivity by up to five-fold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell density is increased in batch mode to increase AAV volumetric yield, then cell density increases, but AAV volumetric yield decreases by over 100-fold
Solution Approach 1:
The patent applies continuous perfusion culture instead of batch mode, where fresh medium is continuously added and waste products are continuously removed. This maintains optimal nutrient levels and removes inhibitory metabolites throughout the culture period, allowing cells to remain productive at high densities without the yield degradation seen in batch mode. The continuous action of medium exchange sustains high AAV production rates.
Solution Approach 2:
The system dynamically adjusts cell density and medium composition over time through controlled perfusion rates. Cell density is actively managed at optimal levels (e.g., 1-5×10^6 cells/mL) rather than simply increasing it statically, and the perfusion rate is adjusted to maintain optimal culture conditions, enabling sustained high productivity without the detrimental effects of excessive cell density in batch culture.
2Quantity of substance
If cell density is increased to meet patient supply needs, then cell mass increases, but cost of goods increases due to decreased yield efficiency
Solution Approach 1:
The patent changes the operational parameters from batch mode to perfusion mode, fundamentally altering how cell mass is produced. Instead of simply scaling up batch cultures (which decreases yield efficiency), the system uses controlled perfusion to maintain optimal cell density and medium composition, achieving high cell mass with superior yield efficiency. This parameter change transforms the relationship between cell mass and cost, reducing cost of goods while meeting supply needs.
3Device complexity
If batch mode is used to simplify the manufacturing process, then process complexity is reduced, but AAV productivity decreases by up to five-fold
Solution Approach 1:
The perfusion system implements continuous medium exchange and cell retention, maintaining constant optimal conditions for AAV production. This continuous action sustains high cellular productivity throughout the culture period, achieving up to five-fold higher AAV productivity compared to batch mode. The system manages the added complexity through automated perfusion control and cell retention mechanisms.
Data Source
AI summary
This application provides modified batch systems and methods using perfusion (e.g., intensified perfusion) for increasing productivity and/or cell density in viral particle production to achieve high viral particle, e.g., AAV yield.