Site-Specific Nucleic Acid Cleavage Using Metal Nanoparticles
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Solution Overview
Problem
Existing nucleic acid strand cleaving methods using silver ions result in low recovery rates due to non-specific interactions, leading to inefficient cleavage and aggregation, while existing site-specific cleavage methods using photodecomposable compounds are cumbersome.
Innovation Solution
Employing metal nanoparticles, particularly silver nanoparticles, as cleaving agents with surface treatment by polyethylene glycol to enhance dispersibility and cleavage efficiency, and using phosphoramidite methods for nucleic acid synthesis to introduce sulfur or selenium sites for targeted cleavage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver ions are used as cleaving agents, then cleavage of nucleic acid strands can be achieved, but the recovery rate of target nucleic acid is low due to non-specific interactions and aggregation
Solution Approach 1:
The patent introduces a specific mediator (cleaving agent with optimized properties) that enables selective cleavage at sulfur or selenium sites without causing non-specific interactions. This mediator approach resolves the contradiction by providing targeted action while avoiding the harmful aggregation effects of conventional silver ions.
Solution Approach 2:
The patent changes key parameters of the cleving agent system, specifically using metal nanoparticles instead of ionic silver, and controlling particle size and surface properties. These parameter changes maintain cleavage effectiveness while eliminating the non-specific interactions that reduce recovery rate.
2Manufacturing precision
If photodecomposable compounds are used for site-specific cleavage, then cleavage precision is improved, but the process becomes cumbersome
Solution Approach 1:
The patent replaces complex photodecomposable chemical systems with a simpler nanoparticle-based cleaving system. This substitution maintains site-specific precision through selective binding to sulfur/selenium sites while eliminating the cumbersome photodecomposition requirements and complex reagent handling.
Solution Approach 2:
The patent employs simple, readily available metal nanoparticles as disposable cleaving agents that can be easily introduced and removed, replacing the need for complex, multi-step photodecomposable compound systems. This approach achieves precision without process complexity.
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 method achieves high cleavage efficiency and recovery rates of target nucleic acids, enabling efficient formation of sticky ends in double-stranded DNA for improved ligation and genetic manipulation processes.
Implementation Method 1
a cleaving step of reacting the nucleic acid to be cleaved with a cleaving agent to cleave the nucleic acid to be cleaved at the part X of the Formula (1)
Data Source
Figure 1~3(b)
Figure 4(a)~6
Figure 7(a)~8(b)
AI summary
There is provided a nucleic acid strand cleaving method including a nucleic acid preparation step of preparing a nucleic acid to be cleaved having a structure represented by the following Formula (1), and a cleaving step of reacting the nucleic acid to be cleaved with a cleaving agent to cleave the nucleic acid to be cleaved at the part X of the Formula (1) to generate a nucleic acid having a structure represented by the following Formula (2). The cleaving agent is a metal nanoparticle containing an atom selected from the group consisting of silver, mercury, and cadmium. [Chemical Formula 1] Here, B represents a base, and X represents sulfur or selenium. NucA is composed of at least one nucleotide and is a part of the nucleic acid to be cleaved, and represents a part on the 5' end side with reference to the X. NucB is composed of at least one nucleotide and is a part of the nucleic acid to be cleaved, and represents a part on the 3' end side with reference to the X.