15N-Labeled DNA Mutation by Proton Resonance Irradiation
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Solution Overview
Problem
Current gene mutation methods lack a quantitative procedure to evaluate DNA damage and often require time-consuming screening for desired phenotypes, and existing genome editing technologies are subject to regulatory restrictions.
Innovation Solution
A method utilizing the 15N (1H, α1γ)12C resonant nuclear reaction to locally mutate target genes by proton beam irradiation, enabling quantitation of mutations through detection of 4.43 MeV gamma-rays, and using 15N-labeled DNA to enhance mutation probability and detectability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mutation breeding methods using gamma-ray heavy-ion beam irradiation are used, then gene mutations can be introduced into target genes, but the degree of DNA damage cannot be quantitatively evaluated and screening requires extensive time and effort
Solution Approach 1:
The patent applies feedback by detecting the 4.43 MeV gamma-ray emitted during the 15N(p,α1γ)12C resonant nuclear reaction to obtain real-time information about the number of 15N nuclei affected. This feedback mechanism allows quantitative evaluation of DNA damage degree during the mutation process, enabling precise control and elimination of extensive screening requirements.
2Manufacturing precision
If genome editing technology is used to modify specific genes, then precise gene modification can be achieved, but the technology is subject to gene recombination regulations and restrictions
Solution Approach 1:
The patent replaces the biological genome editing mechanism (which involves DNA recombination and is subject to regulations) with a physical nuclear reaction mechanism. By using proton beam irradiation to induce 15N(p,α1γ)12C resonant nuclear reactions, mutations are introduced through physical nuclear transformations rather than biological recombination processes, thereby avoiding gene recombination regulations while maintaining precise gene modification capability.
3Productivity
If 15N abundance is increased in DNA to enhance mutation probability, then gene mutation efficiency is improved, but the complexity of the method increases
Solution Approach 1:
The patent changes the isotopic parameter of nitrogen in DNA from natural abundance to enriched 15N abundance. This parameter change increases the probability of 15N(p,α1γ)12C resonant nuclear reactions during proton beam irradiation, thereby enhancing mutation introduction efficiency. The complexity is managed by using established isotopic enrichment techniques and resonant nuclear reaction physics.
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
Enables precise, localized gene mutation without genetic recombination regulations, allowing for quantitation of mutations and efficient screening for desired phenotypes.
Implementation Method 1
in the (p, α1γ) reaction channel of the 15N(1H, α1γ)12C resonant nuclear reaction where 16O* in the 12.9686 MeV level emits a particles and is deexcited into 12C* in the 11.6007 MeV first excitation level
Implementation Method 2
the emission of the reaction secondary particles which have high ionization effects highly and locally ionize biomolecules near the 15N and provides a high probability of production of the desired gene mutation in DNA
Implementation Method 3
a 4.43 MeV gamma-ray is emitted through deexcitation from the 12C* first excitation level to the ground state in reaction
Data Source
AI summary
An artificial gene has a 15N abundance exceeding a natural abundance in bases of at least a portion of DNA. A method for mutating a gene includes a first step of producing a state in which 15N is unevenly distributed into a prescribed DNA in a living cell; and a second step of irradiation with a proton beam at an energy at which the 15N produces a resonant nuclear reaction.