Fed-Batch In Vitro Transcription With NTP Consumption Feedback
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Solution Overview
Problem
In vitro transcription (IVT) methods suffer from low yield, truncated transcripts, 3′ heterogeneity, and double-stranded contaminants, with batch reactions being limited by a single nucleotide and inefficient use of expensive cap analogs.
Innovation Solution
Empirically-balanced fed-batch IVT methods that adjust nucleotide ratios based on consumption rates to prevent depletion, allowing continuous supplementation of reactants, and incorporate co-transcriptional capping to enhance yield and integrity of RNA products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batch IVT reactions are used with initial concentrations of NTPs, then the reaction setup is simple, but the yield of RNA transcript is low due to limiting reagents
Solution Approach 1:
The patent implements fed-batch IVT reactions where NTPs are continuously supplemented during the reaction rather than providing all reagents at the beginning. This continuous supplementation ensures that NTP concentrations remain adequate throughout the transcription process, eliminating the limiting reagent problem that plagues batch reactions and significantly improving RNA transcript yield.
Solution Approach 2:
The patent dynamically adjusts NTP concentrations during the reaction by monitoring consumption rates and supplementing accordingly. Rather than using fixed initial concentrations, the system adapts NTP levels in real-time based on actual consumption patterns, optimizing the reaction conditions throughout the process to maximize yield.
2Productivity
If fed-batch methods are used to improve yield, then RNA production increases, but the process requires prior knowledge of RNA product sequence
Solution Approach 1:
The patent employs a feedback mechanism where the system monitors its own NTP consumption rates and uses this information to guide supplementation. The consumption rate data generated during the reaction serves the dual purpose of optimizing yield and enabling the method to be applied to any RNA sequence, as the feedback loop automatically adapts to the specific transcription requirements without requiring prior sequence knowledge.
Solution Approach 2:
The patent implements a feedback-controlled fed-batch system where NTP consumption is monitored in real-time and this information feeds back into the supplementation strategy. This feedback mechanism allows the system to automatically optimize NTP levels based on actual consumption patterns, making the method universally applicable to any RNA sequence while maintaining high yield.
3Productivity
If equimolar NTP concentrations are used, then the initial setup is straightforward, but one nucleotide becomes rate-limiting reducing overall efficiency
Solution Approach 1:
The patent changes the NTP concentration parameters from fixed equimolar ratios to dynamic, non-equimolar concentrations based on measured consumption rates. By adjusting the NTP ratio parameters to match actual consumption patterns, the system eliminates rate-limiting nucleotides and optimizes transcription efficiency without requiring complex manual optimization.
Solution Approach 2:
The patent uses feedback from measured NTP consumption rates to determine the optimal NTP ratios for supplementation. This feedback-driven approach automatically identifies and corrects imbalances in NTP consumption, ensuring that no single nucleotide becomes rate-limiting while simplifying the setup process compared to manual optimization.
4Productivity
If batch reactions are used, then the process is simple to operate, but expensive cap analogs are wasted due to inefficient use
Solution Approach 1:
The patent implements continuous supplementation of cap analogs during the fed-batch IVT reaction, ensuring that cap analog availability matches the ongoing transcription activity. This continuous provision of cap analogs maximizes capping efficiency throughout the reaction and minimizes waste, as cap analogs are supplied at rates that match actual consumption rather than being present in excess from the start.
Data Source
AI summary
The present disclosure provides methods of in vitro transcribing a ribonucleic acid (RNA) of interest. In some embodiments, such methods include determining consumption rates of nucleoside triphosphates (NTPs).