Modified Poly(A) Tail Composition for Stable High-Expression mRNA
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Solution Overview
Problem
Existing mRNA production processes face challenges in achieving high fidelity during bacterial cloning and enhancing the expression level and stability of mRNA therapeutics, necessitating improved compositions and methods for recombinant protein expression.
Innovation Solution
Incorporation of a modified poly(A) tail sequence with specific cytidine-containing segments and a linker sequence in mRNA molecules to minimize copy errors and enhance expression levels, utilizing optimized cytosine-containing tail sequences in artificial poly(A) sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard poly(A) tail is used in mRNA molecules, then the mRNA can be produced and expressed, but copy errors occur during bacterial cloning and expression levels are suboptimal
Solution Approach 1:
The patent applies local quality by introducing a specific cytidine-containing segment within the poly(A) tail sequence. This localized modification (positions 70-90 out of 100 nucleotides) creates a distinct functional region that differs from the standard poly(A) composition, thereby improving both cloning fidelity and mRNA stability without altering the entire tail structure
Solution Approach 2:
The patent changes the compositional parameters of the poly(A) tail by incorporating a specific number of cytidine residues (about 20-40 cytosines) at defined positions within the tail. This parameter change from the standard homogeneous poly(A) structure to a heterogenous poly(A-C) structure resolves the contradiction between replication fidelity and mRNA stability
2Productivity
If modified poly(A) tail sequences are incorporated to enhance mRNA stability and expression, then protein expression levels increase, but the complexity of the nucleic acid construct increases
Solution Approach 1:
The patent segments the poly(A) tail into functionally distinct regions: a 5′ terminal adenine segment (nucleotides 1-69), a cytidine-containing segment (nucleotides 70-90), and a 3′ terminal adenine segment (nucleotides 91-100). This segmentation allows each region to perform optimized functions while maintaining overall structural organization, thereby increasing productivity without excessive complexity
Solution Approach 2:
The modified poly(A) tail with cytidine-containing segment serves multiple functions simultaneously: it enhances cloning fidelity during bacterial propagation, stabilizes the mRNA molecule against degradation, and boosts protein expression levels. This multi-functionality achieves high productivity without proportionally increasing construct complexity
Data Source
AI summary
The present invention discloses a modified poly(A) sequence for use in a recombinantly produced mRNA molecule for the purpose of improving the production process of the mRNA and subsequent protein expression from the mRNA. Thus, new and effective compositions and methods are provided for use in various applications involving improved production process of an mRNA of interest as well as enhanced expression of the mRNA-encoded protein.