Solid-Support Oligonucleotide Synthesis With Extended Linkers
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Solution Overview
Problem
Steric hindrance during oligonucleotide synthesis on controlled pore glass (CPG) particles leads to errors in longer oligos due to high density of attachment points, while larger pore sizes reduce ligand loading capacity and uneven distribution of silanol attachment points.
Innovation Solution
The use of extended length linkers comprising polyalkylene glycol phosphate/phosphonate ester units attached via phosphoramidite chemistry, which increases the distance from the solid support surface during synthesis, allowing for more flexible and efficient oligonucleotide synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high density of attachment points is used on CPG particles, then synthesis scale is maximized, but steric hindrance occurs leading to errors in longer oligos
Solution Approach 1:
The patent introduces a spacer arm as an intermediary component between the CPG particle surface and the oligonucleotide attachment point. This spacer arm physically separates the oligonucleotide from the solid support surface, reducing steric hindrance and improving synthesis accuracy for longer oligos while maintaining high attachment point density for scalable production
Solution Approach 2:
The invention extends the attachment geometry into the third dimension by using spacer arms that protrude from the CPG surface. This vertical extension creates additional spatial dimension for oligonucleotide attachment, allowing high surface density while maintaining adequate separation between adjacent oligos to prevent steric interference
2Ease of operation
If larger pore sizes are used in CPG particles, then steric hindrance is reduced, but ligand loading capacity decreases due to reduced surface area
Solution Approach 1:
The patent segments the attachment system into two functional components: the CPG particle providing surface area for high ligand loading, and the spacer arm providing steric separation. This segmentation allows optimization of pore size for loading capacity while the spacer arm compensates for steric hindrance, eliminating the need to increase pore size
3Ease of operation
If spacers are used to increase distance from substrate, then flexibility and space for synthesis improve, but ligand loading capacity may be reduced
Solution Approach 1:
The patent optimizes the spacer arm parameters (length, composition, and structure) to achieve the minimum effective distance from the substrate that provides sufficient flexibility and space for synthesis. By carefully tuning these parameters, the design maintains high ligand loading capacity while providing adequate steric separation for efficient oligonucleotide synthesis
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
Enhances oligonucleotide synthesis by reducing steric hindrance and maintaining high ligand loading capacity, resulting in improved synthesis efficiency and product quality.
Implementation Method 1
The polyalkylene glycol phosphate/phosphonate ester units may be attached via phosphoramidite chemistry
Data Source
AI summary
Functionalized solid supports are useful in the synthesis of oligonucleotides. The functionalized solid supports contain an extended linker to a terminal functional group or a first nucleotide or nucleoside moiety. The extended linker permits oligonucleotide synthesis to take place at a greater distance from the solid support with greater efficiency.