AAV Capsid Singleton Correction for Packaging Yield
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Solution Overview
Problem
Existing AAV vectors often exhibit low packaging yield, transduction efficiency, and gene transfer efficiency due to the presence of singletons in their capsid sequences.
Innovation Solution
The method involves correcting singletons in AAV capsid sequences by altering them to conform to the amino acids found in functional AAV capsid sequences, thereby improving packaging yield, transduction efficiency, and gene transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AAV vectors contain singleton amino acids in their capsid sequences, then they can be produced through standard viral replication, but their packaging yield, transduction efficiency, and gene transfer efficiency are reduced
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence parameters of the AAV capsid protein. Specifically, singletons (rare or unique amino acids at particular positions) are replaced with consensus amino acids that are more commonly found in functional AAV capsids. This sequence parameter modification restores optimal capsid structure and function, thereby improving packaging yield and transduction efficiency simultaneously.
Solution Approach 2:
The patent employs copying by using sequence alignment and conserved region analysis to identify and replicate successful capsid sequences from functional AAVs. The method copies the amino acid sequences from known functional AAV capsids onto the capsid of interest, replacing singletons with consensus sequences from the aligned functional sequences, thus creating an optimized capsid design.
2Productivity
If AAV vectors have non-functional or weakly functional capsids, then they can still be produced, but their gene transfer efficiency is compromised
Solution Approach 1:
The patent modifies the capsid sequence parameters by identifying and correcting singletons through alignment with functional AAV sequences. This parameter optimization ensures that the capsid structure achieves the necessary functional properties for efficient gene transfer while maintaining high production levels of infectious particles.
Solution Approach 2:
The patent implements feedback by using sequence alignment data from functional AAV capsids to guide the correction of singletons in non-functional or weakly functional capsids. The alignment results provide feedback information about which amino acid changes are likely to improve function, allowing iterative optimization of the capsid sequence.
Data Source
AI summary
A method of correcting singletons in a selected AAV sequence in order to increasing the packaging yield, transduction efficiency, and/or gene transfer efficiency of the selected AAV is provided. This method involves altering one or more singletons in the parental AAV capsid to conform the singleton to the amino acid in the corresponding position(s) of the aligned functional AAV capsid sequences.