Magnified Oligonucleotide Array Synthesis via Projection Optics
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Solution Overview
Problem
Existing methods for synthesizing high-density oligonucleotide arrays require multiple precision photolithographic masks and multiple processing steps, leading to high costs and lengthy processing times, and are limited by the small quantity of oligomers produced on flat glass substrates.
Innovation Solution
An automated system using a light emitting object array with a micromirror device to project a magnified image onto a substrate, increasing the active area for oligomer synthesis and allowing for larger quantities of oligonucleotides and other chain molecules to be produced, utilizing spherical mirrors to minimize aberration and dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple precision photolithographic masks are used for synthesizing oligonucleotide arrays, then manufacturing precision is improved, but device complexity and production cost increase
Solution Approach 1:
The patent uses a single photolithographic mask that is repeatedly positioned and reused to define multiple oligonucleotide sequences. Instead of requiring four different masks for each base (A, C, G, T), the same mask pattern is copied onto the substrate multiple times at different positions, with each copy receiving different oligonucleotide building blocks during successive synthesis cycles. This dramatically reduces the number of masks needed from potentially dozens to just one or a few reusable masks.
Solution Approach 2:
The patent pre-patterns the substrate with protected hydroxyl groups using a single mask before the actual oligonucleotide synthesis begins. This preliminary photolithographic step creates a stable template that guides subsequent coupling reactions. The mask remains in place or is reused for multiple synthesis cycles, allowing the same spatial pattern to be repeatedly utilized without requiring new masks for each base type.
2Manufacturing precision
If multiple processing steps with mask repositioning are performed, then oligonucleotide array synthesis is completed, but processing time increases
Solution Approach 1:
The patent maintains continuous synthesis operation by keeping the photolithographic mask in place or quickly repositioning it to pre-determined locations. Instead of removing and replacing masks between synthesis steps, the system performs multiple coupling, deprotection, and oxidation cycles using the same mask or a small set of masks. This eliminates repeated mask handling time and allows the synthesis process to proceed with minimal interruption.
Solution Approach 2:
The substrate is pre-patterned with photolabile protecting groups using a single mask before synthesis begins. This preliminary action creates a stable spatial template that eliminates the need for repeated mask alignment and repositioning during subsequent synthesis cycles. The pre-established pattern allows rapid, continuous oligonucleotide building without time-consuming mask changes.
3Quantity of substance
If the active area of flat microarray substrate is increased to produce more oligomers, then quantity of oligomers increases, but practical feasibility decreases
Solution Approach 1:
The patent transitions from synthesizing oligomers across a two-dimensional flat surface to synthesizing them along a one-dimensional linear array. By arranging oligonucleotide synthesis sites in a line rather than spreading them across a large flat area, the system achieves high oligomer quantities in a compact format that is easier to manufacture and handle. The linear configuration maintains high density while improving practical feasibility.
Solution Approach 2:
The patent changes the spatial configuration parameter from a wide, flat two-dimensional array to a narrow, linear one-dimensional array. This parameter change allows the system to achieve high oligomer yields (1-100 picomoles) in a compact format that is more practical for manufacturing and application. The linear arrangement maintains high synthesis density while improving ease of manufacture and handling.
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 system enables significant increase in the quantity of oligomers produced, achieving yields in the 1-100 picomoles range, sufficient for massive libraries, while maintaining high fidelity and reducing production costs and time.
Implementation Method 1
A light emitting object array having selectable light and dark areas in the array is used to define the image that will be projected on to the active surface
Implementation Method 2
Projection optics receives the light emitted from the light emitting object array and images the pattern of the array onto the active surface of the substrate
Implementation Method 3
the surface of a solid support modified with photolabile protecting groups is illuminated through a photolithographic mask, yielding reactive hydroxyl groups in the illuminated regions
Implementation Method 4
A 3′ activated deoxynucleoside, protected at the 5′ hydroxyl with a photolabile group, is then provided to the surface such that coupling occurs at sites that had been exposed to light
Implementation Method 5
Following coupling and oxidation, the substrate is rinsed and the surface is illuminated through a second mask to expose additional hydroxyl groups for additional coupling
Data Source
AI summary
Synthesis of arrays of chain molecules, such as oligonucleotides, in large quantities can be carried out utilizing projection onto an active substrate of a magnified image of a light emitting object array having selectable regions of light and dark areas forming a pattern. Projection optics formed entirely of mirrors are used to receive the light emitted from the object array and image the pattern of the array onto the active surface of the substrate. The mirrors in the projection optics include a first, concave mirror, a second, convex mirror, a third, concave mirror, and a fourth, convex mirror, each receiving the beam of light in turn, with the light reflected from the fourth mirror being imaged onto the active surface of the substrate with an image area greater than that of the original light emitting array.