Architect Oligo Mediated DNA Synthesis
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Solution Overview
Problem
Current DNA synthesis methods are costly and inefficient, with high error rates and complexity in assembling oligonucleotides into larger genes, resulting in prohibitively expensive synthesis of larger DNA fragments.
Innovation Solution
A template-independent, exponential DNA synthesis method using Architect oligonucleotides and Donor oligonucleotides, which undergo repeated cycles of Extend, Ligation, Amplification, and Cleavage to synthesize DNA fragments of up to 10 kilobases in less than 14 cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional oligonucleotide assembly methods are used, then DNA synthesis can be performed, but the cost per base pair remains prohibitively high and error rates increase with fragment length
Solution Approach 1:
The DNA synthesis process is divided into discrete cycles, each adding a specific number of base pairs (e.g., 2 bp, 4 bp, 8 bp increments). Architect oligos are segmented into modular components that can be systematically combined through iterative assembly cycles, allowing precise control over synthesis accuracy at each stage while building longer fragments.
Solution Approach 2:
The patent employs periodic cycles of extension, ligation, and cleavage operations. Each cycle follows a standardized sequence of steps that can be repeated multiple times, with parameters optimized for each specific cycle type. This periodic approach maintains consistent error rates across cycles while enabling systematic accumulation of DNA length.
2Length of moving object
If iterative oligonucleotide assembly is used to build larger DNA fragments, then longer sequences can be synthesized, but the number of assembly steps increases and compounding errors reduce reliability
Solution Approach 1:
The system dynamically adjusts the number of base pairs added in each cycle based on the current fragment length. Early cycles add fewer base pairs when the fragment is short, while later cycles can add more base pairs as the fragment grows. This dynamic approach optimizes the balance between extension efficiency and error accumulation, maintaining reliability while achieving longer final lengths.
Solution Approach 2:
Architect oligos serve as intermediary molecules that facilitate accurate assembly. These oligos contain specific sequences that guide the ligation process and ensure correct joining of donor oligos. The architect oligos act as temporary mediators that are later cleaved off, leaving only the desired DNA sequence. This intermediary mechanism significantly reduces assembly errors compared to direct ligation methods.
3Length of moving object
If more assembly cycles are performed to synthesize longer DNA fragments, then the desired length is achieved, but the time required and compounding errors increase
Solution Approach 1:
The patent maintains continuous productive action throughout the synthesis process by optimizing each cycle to maximize the amount of useful DNA extension. Rather than having idle steps or repeated verification cycles, each operation (extension, ligation, cleavage) is tightly coupled and optimized to contribute directly to fragment lengthening. This continuous approach reduces total synthesis time while maintaining accuracy.
Solution Approach 2:
The system changes key parameters between cycles, including the number of base pairs added, enzyme concentrations, and temperature profiles. By systematically varying these parameters, the process adapts to the growing fragment length, maintaining efficient kinetics throughout. This parameter optimization ensures that each cycle completes in minimal time while achieving the desired extension, reducing overall synthesis time.
4Productivity
If a limited set of architect oligos is used to enable exponential synthesis, then cycle number is reduced, but the complexity of oligonucleotide design increases
Solution Approach 1:
Architect oligos are designed with universal features that allow them to perform multiple functions across different synthesis cycles. Each architect oligo contains conserved regions that recognize common donor oligo structures and variable regions that provide sequence-specific information. This universal design allows a limited set of architect oligos to guide the assembly of many different target sequences, reducing the total number of unique oligos needed while maintaining design simplicity.
Solution Approach 2:
The patent employs homogeneous structures for architect oligos, with all oligos sharing the same basic architecture and chemical modifications. This homogeneity simplifies synthesis and handling while the sequence variations provide the necessary specificity. The uniform design approach reduces the complexity of oligonucleotide preparation and storage, allowing a limited set to be used efficiently across multiple applications.
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 significantly reduces the cost and cycle number required for DNA synthesis, potentially lowering costs by 100- to 1000-fold and reducing errors associated with oligo building technologies.
Implementation Method 1
Architect oligonucleotides and Donor oligonucleotides, which undergo repeated cycles of Extend, Ligation, Amplification, and Cleavage
Data Source
AI summary
A DNA synthesis technology that relies on sequence-directed, multiplexed ligations to enable template-independent, exponential synthesis of gene- or genome-length DNA. This approach relies on well characterized and optimized enzymes and thus does not require further protein engineering. This approach is amenable to cost-effective automation and thus will enable cost-effective DNA “printers”.