Large Nucleic Acid Assembly via Yeast Recombination
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Solution Overview
Problem
Current methods are limited in synthesizing large nucleic acid molecules beyond 5-30 kb, making it difficult to construct larger DNA sequences such as the 600 kb genome of M. genitalium, which requires innovative assembly techniques to overcome the practical upper limits of existing synthetic DNA synthesis.
Innovation Solution
A method combining in vitro and in vivo assembly steps, using overlapping nucleic acid fragments and yeast recombination to assemble large nucleic acid molecules, including the synthesis of complete synthetic genomes, by designing and assembling cassettes of 2-10 kb, then recombining them in a host cell to achieve sequences of 50 kb or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If automated step-wise synthesis is used to synthesize nucleic acid molecules, then manufacturing precision is maintained for small molecules, but the maximum size is limited to 5-30 kb
Solution Approach 1:
The patent divides large nucleic acid molecules into smaller overlapping fragments or cassettes that can be individually synthesized using automated methods. These fragments are then assembled in vivo using yeast recombination systems, allowing the construction of large DNA molecules (50-1000 kb) that exceed the practical limits of direct automated synthesis while maintaining manufacturing precision through controlled in vivo assembly processes.
2Length of stationary object
If in vitro assembly methods are used, then manufacturing precision is maintained, but the maximum assembly size is limited
Solution Approach 1:
The patent introduces yeast cells as an intermediary system that performs the assembly of large nucleic acid fragments. The yeast recombination machinery acts as a biological mediator that correctly joins overlapping DNA fragments with high precision, overcoming the limitations of purely in vitro assembly methods while maintaining manufacturing precision through the cell's natural DNA repair and recombination pathways.
3Length of stationary object
If yeast recombination is used to assemble large DNA molecules, then the size limit is overcome, but the process complexity increases
Solution Approach 1:
The patent utilizes the yeast cell's own recombination machinery to perform the assembly of large nucleic acid molecules. By designing DNA fragments with appropriate overlapping regions and transforming them into yeast cells, the system leverages the cell's endogenous recombination pathways to automatically assemble the fragments into large DNA molecules, reducing the need for complex external assembly apparatus while achieving sizes of 50-1000 kb.
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
Enables the construction of nucleic acid molecules larger than previously feasible, including the complete synthetic genome of M. genitalium, demonstrating the ability to assemble large DNA molecules efficiently and accurately, with potential applications in synthetic genomics and metabolic pathway construction.
Implementation Method 1
yeast recombination is also known. Yeast recombination has since been applied to the construction of plasmids and yeast synthetic chromosome (YACs)
Data Source
AI summary
A method to assemble any desired nucleic acid molecule by combining cassettes in vitro to form assemblies which are further combined in vivo, or by assembling large numbers of DNA fragments by recombination in a yeast culture to obtain desired DNA molecules of substantial size is described.