RNA Oligonucleotide Cleavage from Universal Support
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Solution Overview
Problem
Current methods for cutting out RNA oligonucleotides from universal supports often result in the production of byproducts, leading to low yields and purification difficulties due to similar properties between the byproducts and the target RNA oligonucleotides.
Innovation Solution
A method involving contact with an aqueous solution containing alkylamine and a monovalent inorganic salt, such as sodium bromide, is used to cleave RNA oligonucleotides from universal supports, suppressing byproduct formation and increasing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (alkylamine or aqueous ammonia/alkylamine mixed solution) are used to cut out RNA oligonucleotide from universal support, then the solid phase carrier is cleaved, but RNA oligonucleotide cannot be cleaved well from the universal linker, resulting in large amounts of byproduct and low purity
Solution Approach 1:
The patent changes the chemical parameters of the cleavage reagent by introducing a specific ratio of alkylamine to aqueous ammonia (1:4 to 4:1) and controlling the concentration (20-80% alkylamine, 20-80% aqueous ammonia). This parameter optimization enables simultaneous cleavage of both the solid phase carrier and the universal linker, resolving the contradiction between cleavage efficiency and product purity.
Solution Approach 2:
The patent uses a composite cleavage system combining alkylamine and aqueous ammonia in specific ratios. This composite reagent system leverages the complementary properties of both components: alkylamine for carrier cleavage and aqueous ammonia for linker cleavage, achieving complete release of RNA oligonucleotide with high purity.
2Reliability
If stronger nucleophilic reagents, harsh temperature conditions are used to cleave RNA oligonucleotide from universal linker, then cleavage is improved, but decomposition of RNA oligonucleotide is promoted, decreasing yield
Solution Approach 1:
The patent optimizes the parameters of the cleavage system by using a balanced combination of alkylamine and aqueous ammonia at controlled concentrations and ratios. This moderate parameter setting achieves effective cleavage without the need for harsh conditions, preventing RNA decomposition and maintaining high yield.
Solution Approach 2:
The patent employs aqueous ammonia as an intermediary substance that facilitates linker cleavage without causing RNA decomposition. The ammonia acts as a gentle nucleophilic reagent that can break the linker bond while preserving the integrity of the RNA oligonucleotide structure.
3Loss of substance
If mild conditions are used to increase yield of RNA oligonucleotide, then decomposition is reduced, but byproducts wherein RNA oligonucleotide and universal linker are not cleaved are produced in large amounts
Solution Approach 1:
The patent uses a composite cleavage reagent system combining alkylamine and aqueous ammonia that works synergistically under mild conditions. The alkylamine component ensures complete carrier and linker cleavage while the aqueous ammonia component prevents RNA decomposition, achieving both high yield and high purity simultaneously.
Solution Approach 2:
The patent optimizes the concentration ratios and composition of the cleavage reagent to achieve complete cleavage under mild conditions. By adjusting the alkylamine to aqueous ammonia ratio and their respective concentrations, the system achieves 100% cleavage efficiency without requiring harsh conditions that would decompose the RNA.
4Adaptability or versatility
If universal support is used for solid phase synthesis, then various nucleoside-linkers can be used with the same carrier, but RNA oligonucleotide cannot be cleaved well from the universal linker with conventional methods, making purification difficult
Solution Approach 1:
The patent uses aqueous ammonia as an intermediary reagent that specifically targets the universal linker structure. The ammonia molecules act as nucleophilic intermediaries that break the linker-RNA bond without affecting the RNA structure, enabling complete cleavage from universal supports while maintaining product purity.
Solution Approach 2:
The patent modifies the chemical parameters of the cleavage system by introducing a balanced mixture of alkylamine and aqueous ammonia. This parameter change enables the system to recognize and cleave the universal linker structure specifically, resolving the incompatibility between universal support versatility and cleavage efficiency.
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
This method effectively reduces byproduct production and enhances the yield and purity of RNA oligonucleotides, enabling more efficient and cost-effective mass synthesis.
Implementation Method 1
a step of cutting out the RNA oligonucleotide from the support
Implementation Method 2
bringing the support carrying the RNA oligonucleotide in contact with an aqueous solution containing alkylamine and a monovalent inorganic salt
Data Source
Figure 1
AI summary
Provided is a cut-out method capable of suppressing production of a byproduct, wherein the object RNA oligonucleotide is not cleaved from a universal linker, which is produced in cutting out the object RNA oligonucleotide from the universal support, and capable of increasing the yield of the object RNA oligonucleotide. An RNA oligonucleotide cut-out method, including a step of bringing a universal support supporting an RNA oligonucleotide in contact with an aqueous solution containing alkylamine and a monovalent inorganic salt.