Cleavable Plasmid Backbone for High-Purity Insert Separation
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Solution Overview
Problem
Current methods for separating polynucleotide inserts from vector backbones are cumbersome and time-consuming, often resulting in lower yields due to the need for multiple steps and difficulty in separating fragments with similar sizes, especially when high purity and efficiency are required.
Innovation Solution
A polynucleotide vector backbone designed with specific cleavage sites that allow the backbone to be degraded into small fragments using cleavage means like restriction enzymes, leaving the insert intact, facilitating easy separation using techniques such as spin columns or size exclusion columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional restriction enzyme digestion and agarose gel separation is used to separate insert from vector backbone, then separation can be achieved, but the process becomes cumbersome and time-consuming with multiple steps
Solution Approach 1:
The vector backbone is divided into multiple small fragments through the introduction of multiple cleavage sites distributed throughout its sequence. When cleavage means are applied, the backbone is segmented into numerous small pieces that can be easily separated from the intact insert by size-based methods such as spin columns or size exclusion columns, eliminating the need for time-consuming gel electrophoresis and manual extraction steps
Solution Approach 2:
The cleavage sites are pre-introduced into the vector backbone sequence before the actual separation process. This preliminary design allows the backbone to be rapidly degraded into small fragments upon contact with cleavage means, automatically facilitating separation from the insert without requiring subsequent complex purification steps
2Manufacturing precision
If conventional digestion and gel extraction is used, then insert can be purified, but yield is reduced due to multiple handling steps and potential loss during transfer
Solution Approach 1:
By segmenting the backbone into many small fragments through multiple cleavage sites, the size difference between the backbone debris and the insert is maximized. This enables highly efficient separation using simple size-based methods like spin columns that retain the larger insert while allowing small backbone fragments to pass through, minimizing insert loss and maximizing yield
Solution Approach 2:
The multiple cleavage sites act as intermediaries that facilitate the separation process. When cleaved, these sites generate numerous small backbone fragments that serve as a convenient intermediary form for separation from the insert through size-based methods, avoiding the need for complex gel extraction procedures that cause yield loss
3Manufacturing precision
If the size difference between insert and vector backbone is small, then cloning is more difficult, but conventional methods still require extensive optimization and multiple steps
Solution Approach 1:
Even when the insert and original backbone are similar in size, introducing multiple cleavage sites throughout the backbone sequence segments it into numerous small fragments. This transformation creates a significant effective size difference between the backbone debris and insert, enabling rapid separation by simple size-based methods without requiring extensive protocol optimization
Solution Approach 2:
The invention changes the size parameter of the backbone from a single large fragment to multiple small fragments through the introduction of multiple cleavage sites. This parameter change transforms the separation problem, making it solvable by simple size-based methods regardless of the original size relationship between insert and backbone
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 method simplifies the separation process, improves yield, and enhances the purity of polynucleotide inserts by allowing for efficient removal of unwanted backbone debris, suitable for applications in molecular biology and gene therapy.
Implementation Method 1
contacting the recombinant vector with cleavage means capable of specifically cleaving the first plurality of cleavage sites to produce backbone fragments
Implementation Method 2
separating the insert from the backbone fragments by using a separation technique... the fragments are separated from each other and from the insert based on a size-determined difference in migration
Data Source
AI summary
The invention relates to a method for separating a polynucleotide insert from a polynucleotide vector backbone. The backbone has a plurality of cleavage sites distributed such that the backbone is converted into fragments when the sites are cleaved. This allows straightforward separation of the insert from the backbone. The invention also relates to backbones for use in such a method, and to plasmids and kits comprising such backbones.