Poly-tailed mRNA Stability via Segmentation and Merging
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Solution Overview
Problem
mRNA therapeutics face challenges of instability, toxicity, short-term efficacy, and potential immunological responses, limiting their clinical applications due to rapid degradation by exonucleases, which reduces their stability and translation efficiency.
Innovation Solution
Modified mRNAs with extended poly-A tails and/or multiple 5′ caps are introduced, using click chemistry or dendrimer attachment to enhance stability and translation efficiency by protecting against exonuclease activity and recruiting translation machinery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional poly-A tails and 5′ caps are used to protect mRNA, then translation efficiency is improved, but mRNA stability deteriorates due to rapid exonuclease degradation
Solution Approach 1:
The patent divides the protective function into multiple segments by using multiple poly-A tails (e.g., 2-10 tails) and/or multiple 5′ caps (e.g., 2-10 caps) instead of single conventional structures. This segmentation provides redundant protection against exonuclease degradation while maintaining translation efficiency through multiple binding sites for translation machinery.
Solution Approach 2:
The patent creates composite mRNA structures by combining multiple poly-A tail units and/or multiple 5′ cap units into a single mRNA molecule. These composite structures integrate protective functions with translational activation functions, achieving both stability and translation efficiency simultaneously.
2Stability of the object's composition
If modified nucleotides are introduced to inhibit exonuclease activity, then mRNA stability is improved, but enzyme incorporation efficiency deteriorates
Solution Approach 1:
The patent applies modifications locally rather than globally by using unmodified nucleotides in the main body of the mRNA for easy enzymatic incorporation, while introducing modified nucleotides (e.g., 2′-O-methyl, pseudouridine) specifically in the poly-A tail regions and 5′ cap regions where exonuclease activity is highest. This localized modification strategy achieves stability enhancement without significantly impairing overall synthesis and translation.
3Stability of the object's composition
If multiple poly-A tails and 5′ caps are ligated to mRNA, then mRNA stability and translation efficiency are improved, but device complexity increases
Solution Approach 1:
The patent merges multiple poly-A tail units and/or multiple 5′ cap units into integrated composite structures that function as unified protective and translational elements. This merging reduces the practical complexity of implementation while achieving enhanced stability and translation efficiency through the combined functionality of multiple units.
Data Source
AI summary
Disclosed herein are modified mRNAs with poly(A) tails containing one or more additional poly-A tails or 5′ caps, which may be made by ligation of nucleic acids onto the 3′ terminal end or 5′ terminal end of an RNA, respectively. Also provided are compositions comprising one or more modified mRNAs provided herein, and methods of using said compositions for therapeutic or agricultural applications.