AAV Particle Quality Assessment via Capillary Isoelectric Focusing
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Solution Overview
Problem
Current methods for assessing the full or empty status of Adeno-Associated Virus (AAV) particles used in gene delivery are laborious, require long purification processes, and are not suitable for crude or unpurified samples, leading to inefficiencies in quality control and potential wastage.
Innovation Solution
A method involving capillary isoelectric focusing and immunoassays is used to determine the nucleic acid and protein content of AAV particles, allowing for the quantification and prediction of full, partial, and empty states in samples, even in crude form, by establishing a relationship between signal detection and known proportions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional purification methods are used to assess AAV particle quality, then measurement precision is improved, but productivity deteriorates due to laborious processes and long purification times
Solution Approach 1:
The patent extracts the nucleic acid content determination from the complex purification process by using selective binders that specifically bind to nucleic acids within AAV particles. This allows direct assessment of full versus empty particles without extensive purification, resolving the contradiction between measurement precision and productivity
Solution Approach 2:
The patent introduces selective binders as intermediaries that mediate between the AAV particles and the detection system. These binders specifically target and bind to nucleic acids, enabling indirect but accurate measurement of particle fullness without requiring direct observation or complex purification
2Measurement precision
If traditional purification processes are applied, then measurement precision is improved, but loss of time worsens due to extensive purification requirements
Solution Approach 1:
The patent performs preliminary binding of selective binders to nucleic acids in AAV particles before any purification steps. This preliminary action allows the assessment to proceed directly on crude samples, eliminating the need for time-consuming purification while maintaining measurement precision
Solution Approach 2:
The patent skips the traditional purification step entirely by using a detection method that works directly on crude or unpurified samples. The selective binders enable rapid assessment without rushing through purification protocols, thus eliminating time loss while preserving accuracy
3Measurement precision
If conventional assessment methods are used, then measurement precision is improved, but device complexity worsens due to complex purification and analysis systems
Solution Approach 1:
The patent extracts the essential measurement function (nucleic acid detection) from the complex purification and analysis system by using selective binders that directly target nucleic acids. This simplification maintains measurement precision while dramatically reducing device complexity
Solution Approach 2:
The patent replaces complex mechanical purification systems with a biochemical detection system based on selective binding. This substitution maintains measurement precision while replacing cumbersome mechanical purification equipment with simpler binding and detection mechanisms
4Measurement precision
If traditional quality control methods are applied, then measurement precision is improved, but loss of substance worsens due to sample wastage during purification
Solution Approach 1:
The patent extracts the nucleic acid determination capability from the sample without requiring physical separation or purification steps that cause sample loss. The selective binders enable direct measurement on the original sample, preserving valuable material while maintaining characterization accuracy
Solution Approach 2:
The patent creates a binding complex copy of the nucleic acid-bound selective binder that can be detected without destroying or losing the original AAV particles. This copying mechanism allows accurate measurement while preserving the sample for further use
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
Enables efficient, rapid assessment of AAV particle quality in gene delivery samples, reducing the need for extensive purification and improving the accuracy of quality control by determining the proportion of full, partial, and empty particles.
Implementation Method 1
separating the plurality of viral vectors by applying a voltage between the first running buffer and the second running buffer
Implementation Method 2
separating the plurality of viral vectors in the sample by applying a voltage between the first running buffer and the second running buffer
Data Source
AI summary
Embodiments disclosed include systems, devices, and methods for analysis of samples containing particles used for gene delivery to determine a quality of the sample and/or an indication that the gene delivery particles are in a full, partial, and/or empty state. The present disclosure also relates to determining a protein and/or NA content in samples with known proportions of gene delivery particles in a full, partial, and/or empty state and based on the determination, establish a relationship between NA content and proportions of gene delivery particles in a full state. The present disclosure also relates to using such an established relationship to predict a proportion of the gene delivery particles in a full, partial, and/or empty state in test samples having the gene delivery particles in an unknown state.