Circular RNA Vector Architecture for Prolonged Eukaryotic Translation
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Solution Overview
Problem
The short half-life of messenger RNA (mRNA) in biological systems limits its effectiveness for therapeutic and engineering applications, necessitating a solution to extend protein expression duration.
Innovation Solution
A vector is designed to produce circular RNA (circRNA) within eukaryotic cells, comprising specific elements such as 5' and 3' homology arms, group I intron fragments, and internal ribosome entry sites (IRES) to enhance stability and translation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If messenger RNA is used for therapeutic applications, then protein expression can be achieved, but the half-life is short limiting effectiveness
Solution Approach 1:
The patent applies circularization of the RNA molecule to resolve the short half-life problem. By converting linear mRNA into a circular structure, the molecule becomes resistant to exonuclease degradation, thereby extending its half-life from hours to days while maintaining protein expression capability. This structural transformation directly addresses the contradiction between duration and reliability.
2Stability of the object's composition
If circular RNA is produced using group I intron fragments, then stability is improved, but translation efficiency must be maintained
Solution Approach 1:
The patent uses Internal Ribosome Entry Sites (IRES) as intermediary elements within the circular RNA structure. These IRES sequences act as mediators that recruit ribosomes to the circular RNA template, ensuring efficient translation initiation despite the non-linear structure. This resolves the potential conflict between structural stability and translational productivity by introducing a specialized intermediary component.
Solution Approach 2:
The patent applies local quality optimization by incorporating specific functional elements (IRES, Kozak sequences, start codons) at precise locations within the circular RNA structure. These localized features ensure that translation efficiency is maintained at critical sites while the overall circular structure provides enhanced stability. The non-coding regions are designed with specific properties to facilitate ribosome binding and initiation.
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
The vector allows for the production of biologically active circRNA that provides prolonged protein expression and improved translation efficiency, enabling therapeutic and diagnostic applications.
Implementation Method 1
a 3′ group I intron fragment containing a 3′ splice site dinucleotide... a 5′ group I intron fragment containing a 5′ splice site dinucleotide
Data Source
AI summary
Circular RNA and methods and constructs for engineering circular RNA are disclosed. In some embodiments, the circular RNA includes the following elements arranged in the following sequence: a) a 3′ Group I self-splicing intron fragment, b) an internal ribosome entry site (IRES), c) a protein coding region or noncoding region, and d) a 5′ Group I self-splicing intron fragment.