Quadruplet Codon Biocontainment System
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Solution Overview
Problem
Existing genetic biocontainment technologies face challenges in efficiently preventing the theft or misuse of biological resources, such as nucleic acid molecules or microbial strains, due to limitations in strain manipulation and potential environmental impacts.
Innovation Solution
The use of a quadruplet codon and its decoding system to create a genetic biocontainment system, where a nucleic acid molecule is expressed as a protein only in the presence of a specific tRNA and aminoacyl-tRNA synthetase, minimizing strain engineering and potential environmental burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional biocontainment technologies are used (removing essential genes, using non-natural amino acids, CRISPR enzyme), then biocontainment is achieved to some extent, but the microbial strain requires significant genome modifications and engineering
Solution Approach 1:
The invention changes the fundamental parameter of codon structure from triplet to quadruplet, creating a genetic code that cannot be read by natural translation systems. This parameter change achieves biocontainment without requiring extensive genome modifications, as the containment is built into the genetic code itself rather than requiring removal or modification of essential genes
Solution Approach 2:
The invention introduces a synthetic tRNA as an intermediary component that bridges the quadruplet codon and the natural translation system. This intermediary allows the modified nucleic acid to be expressed only when the specific synthetic tRNA is present, achieving biocontainment through the presence/absence of this single intermediary component rather than through complex genome modifications
2Reliability
If conventional biocontainment technologies are used, then biocontainment is achieved, but there is potential for escaped cells and unauthorized use
Solution Approach 1:
By changing the codon from triplet to quadruplet, the invention creates a fundamental incompatibility with natural translation systems. This parameter change ensures that even if cells escape from controlled environments, they cannot express the modified nucleic acid sequences without the synthetic decoding components, preventing unauthorized use and horizontal gene transfer
Solution Approach 2:
The invention applies preliminary anti-action by designing the genetic code to be inherently resistant to natural translation systems. The quadruplet codon structure and synthetic tRNA requirement create a built-in defense mechanism that prevents expression before escape or unauthorized use can occur, rather than relying on post-escape detection or control
3Reliability
If triplet codons are replaced with quadruplet codons, then biocontainment is achieved through decoding system dependency, but the nucleic acid sequence becomes more complex
Solution Approach 1:
The invention changes the codon parameter from triplet to quadruplet, which increases sequence length but creates a fundamental dependency on synthetic decoding components. This parameter change achieves biocontainment because the increased complexity is not in the information content but in the decoding requirement, which acts as a biological lock
4Reliability
If significant genome modifications are made to achieve biocontainment, then containment is achieved, but the ease of manufacture and operation decreases
Solution Approach 1:
The invention uses a synthetic tRNA as an intermediary that can be introduced via simple plasmid transformation rather than requiring complex genome modifications. This intermediary approach dramatically simplifies manufacture and operation, as the synthetic tRNA gene can be cloned into any expression vector and introduced into the target organism without modifying its genome
Solution Approach 2:
By changing the codon structure to quadruplet, the invention creates a containment system that requires only the introduction of the synthetic tRNA gene, simplifying the manufacturing process compared to conventional methods that require removing or modifying essential genes throughout the genome
Data Source
AI summary
The present invention relates to a genetic biocontainment technology to prevent theft or misuse of biological resources (e.g., nucleic acid molecule, plasmid or microbial strain containing the nucleic acid molecule, or sequence information associated with the nucleic acid molecule) using a quadruplet codon and decoding system thereof. In particular, the present invention relates to a system or a microbial strain comprising a nucleic acid molecule in which a triplet codon encoding a specific amino acid in a nucleic acid sequence has been replaced with a quadruplet codon, wherein genetic biocontainment occurs in an environment where tRNA for the quadruplet codon does not exist, and a method using the same. The present invention also relates to a biocontainment method to protect sequence information using a quadruplet codon.