Plasmid Homopolymer Positioning for Replication Yield
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Solution Overview
Problem
Homopolymeric sequences in plasmid vectors hinder efficient replication and lead to decreased yield and stability during fermentative production, as they can disrupt the replication process and be partially deleted.
Innovation Solution
A linear plasmid DNA template is designed with a homopolymeric region, such as a poly(A) sequence, positioned at least 2200 bp away from the origin of replication, allowing for efficient replication and transcription, and a method for producing RNA using this template involves in vitro transcription with a DNA-dependent RNA polymerase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homopolymeric sequences are included in plasmid vectors, then RNA transcription capability is improved, but replication efficiency deteriorates
Solution Approach 1:
The plasmid vector is segmented into functional regions with the homopolymeric sequence (poly(A)) separated from the origin of replication by a defined distance. This spatial segmentation allows the homopolymeric region to function for RNA transcription while the origin of replication maintains its replication efficiency, resolving the contradiction between transcription capability and replication reliability.
2Device complexity
If homopolymeric sequences are positioned close to the origin of replication, then vector complexity is reduced, but DNA stability deteriorates
Solution Approach 1:
The vector structure is designed with different local qualities: the homopolymeric sequence region is optimized for RNA transcription function, while the origin of replication region is optimized for replication stability. The spatial separation ensures that the homopolymeric sequence does not disrupt replication, maintaining DNA stability while preserving transcription capability.
3Adaptability or versatility
If homopolymeric sequences are included in plasmid vectors, then RNA therapeutics production is enabled, but fermentation yield deteriorates
Solution Approach 1:
The plasmid vector is pre-designed with the homopolymeric sequence positioned at an optimal distance from the origin of replication before fermentation. This preliminary configuration ensures that during fermentative production, the homopolymeric sequence will not disrupt replication processes, thereby maintaining high fermentation yield while enabling RNA therapeutics production.
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 configuration enhances fermentation time and yield of the recombinant DNA molecule by preventing replication disruptions and ensuring stable transcription, while also facilitating the production of RNA therapeutics.
Implementation Method 1
a method for producing RNA by in vitro transcription using the linear DNA template
Data Source
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AI summary
The present invention relates to a covalently closed circular recombinant DNA molecule comprising an origin of replication and an insert comprising a homopolymeric region, wherein the homopolymeric region is located at a distance of least 500 bp from the origin of replication in the direction of replication and/or wherein the insert comprising a homopolymeric region is oriented so that the direction of transcription of the insert is the same as the direction of replication of the origin of replication. The invention further relates to the use of the covalently closed circular recombinant DNA molecule for increasing the yield and/or shortening the fermentation time during fermentation.