Circular DNA Template mRNA Synthesis Without Plasmid Fermentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for nucleic acid amplification, particularly DNA and RNA synthesis, are time-consuming and inefficient, especially in the absence of plasmids and bacterial fermentation, necessitating improved in vitro transcription processes for rapid response to viral changes.
Innovation Solution
A cell-free enzymatic method for nucleic acid synthesis involving a circular double-stranded DNA template, primers, and RNA polymerase, conducted without polyamines, with controlled temperature and time parameters, and optionally including restriction enzymes and capture methods like oligo (dT) magnetic beads, to produce mRNA molecules efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multi-step methods using plasmids and bacterial fermentation are used, then DNA templates can be produced, but the process is time-consuming and cannot provide rapid response to viral changes
Solution Approach 1:
The patent extracts and eliminates the time-consuming steps of plasmid construction and bacterial fermentation from the workflow. By using pre-synthesized circular gDNA templates that skip these intermediate steps, the method achieves rapid mRNA production in under 4 hours, directly addressing the time loss issue without sacrificing productivity
Solution Approach 2:
The patent employs preliminary action by pre-synthesizing the circular gDNA templates before mRNA production. These templates are prepared in advance through cell-free DNA synthesis, so that when viral changes occur, the laboratory can immediately begin mRNA synthesis without waiting for bacterial fermentation cycles, thus reducing response time while maintaining high productivity
2Productivity
If traditional in vitro transcription methods are used, then mRNA can be synthesized, but multiple intermediate purification steps are required which reduce efficiency
Solution Approach 1:
The patent merges multiple separate steps into a single integrated reaction system. The circular gDNA template, primer, dNTPs, and DNA polymerase are combined in one reaction vessel, followed by direct addition of RNA polymerase and ribonucleotides for in vitro transcription. This consolidation eliminates intermediate purification steps, improving efficiency while reducing device complexity
Solution Approach 2:
The patent creates a universal reaction system that performs both DNA synthesis and mRNA transcription functions within the same workflow. The circular gDNA template serves multiple purposes: it acts as the transcription template and eliminates the need for separate plasmid preparation steps. This multi-functionality reduces the number of reaction steps and improves overall efficiency without adding complexity
3Reliability
If polyamines are used in the transcription reaction system, then transcription can proceed, but the reaction requires additional components that increase complexity
Solution Approach 1:
The patent extracts and removes polyamines from the transcription reaction system. By formulating the reaction without polyamines and using alternative components (buffer, magnesium ion, reducing agent), the method maintains reliable transcription efficiency while simplifying the reaction composition and reducing device complexity
Solution Approach 2:
The patent changes the chemical parameters of the reaction system by substituting polyamines with a different set of components. The transcription reaction proceeds reliably using a buffer, magnesium ion, and reducing agent instead of polyamines, achieving the same functional outcome with simpler, more controllable reaction conditions that reduce system complexity
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
Facilitates the production of high-purity, clinical-grade mRNA molecules rapidly and reproducibly, suitable for vaccines and therapeutics, while adhering to good manufacturing practices, without intermediate purification steps.
Implementation Method 1
cell-free enzymatic synthesis of DNA
Implementation Method 2
synthesis of DNA molecules and templates for IVT
Implementation Method 3
synthesis of RNA molecules via in vitro transcription (IVT)
Implementation Method 4
in vitro transcription reaction system comprising an RNA polymerase and ribonucleotides
Implementation Method 5
contacting the incubated composition with a restriction endonuclease to obtain a digested composition
Implementation Method 6
capturing the mRNA molecule using a capture method selected from the group consisting of an oligo (dT) magnetic bead
Implementation Method 7
oligo (dT) magnetic bead
Data Source
AI summary
Described are methods for producing RNA molecules in an in vitro transcription reaction. Also described are methods for producing an mRNA molecule from a circular double-stranded DNA template using an in vitro transcription reaction system wherein the in vitro transcription reaction system lacks a polyamine. Also described are in vitro transcription reaction systems comprising enzymatic 5′ capping and oligo (dT) purification.