Modular DNA Block Assembly for Multigene Plasmid Cloning
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Solution Overview
Problem
Current methods for cloning multigene plasmids require multiple time-consuming and labor-intensive steps, particularly the preliminary cloning of single-gene vectors, which are resource-intensive and inefficient for generating complex antibody formats.
Innovation Solution
A modular cloning method that uses PCR-produced DNA blocks and adaptors with unique recombination sites to directly assemble expression cassettes into vector backbones, eliminating the need for intermediate single-gene vector cloning steps and enabling fast cloning of variable gene configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preliminary single-gene vectors are used for cloning multigene plasmids, then the cloning process follows traditional sequential steps, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent segments the multigene plasmid into multiple DNA blocks, each flanked by unique recombination sites. These standardized blocks can be independently cloned and then assembled through recombination, eliminating the need for sequential cloning of single-gene vectors and significantly reducing time while maintaining reliability through modular design
Solution Approach 2:
The patent performs preliminary standardization of DNA blocks with predefined recombination sites and adaptors before assembly. This preliminary preparation enables direct assembly of multiple blocks into the final multigene plasmid without requiring intermediate single-gene vector steps, thus saving time while ensuring correct orientation and sequence integrity
2Ease of manufacture
If traditional multi-step cloning is used, then intermediate single-gene vectors are created, but this increases labor and resource requirements
Solution Approach 1:
The patent creates universal DNA blocks with standardized recombination sites and adaptors that can be used across different multigene plasmid constructions. These universal components simplify the cloning process by allowing direct assembly without intermediate vectors, reducing both labor and process complexity while maintaining ease of manufacture through reusable standardized parts
3Productivity
If PCR-produced DNA blocks with unique recombination sites are assembled directly, then intermediate cloning steps are eliminated, but the assembly requires precise recombination site matching
Solution Approach 1:
The patent employs asymmetric recombination sites where each DNA block has unique forward and reverse recombination sites. This asymmetry ensures that blocks can only assemble in the correct orientation and sequence, achieving high productivity through direct assembly while maintaining manufacturing precision through directional constraints that prevent incorrect pairing
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 approach significantly reduces time, labor, and costs by allowing direct cloning of multigene vectors in a single step, enhancing the efficiency of generating complex antibody formats and reducing the need for resource-intensive processes.
Implementation Method 1
PCR-produced DNA blocks carrying genes for different antibody chains are ligated with the respective adaptors
Implementation Method 2
the PCR-produced fragments of the first step are assembled in the correct arrangement via the unique recombination sites located at one end of each backbone, DNAblock and adaptor fragment
Data Source
AI summary
Herein a modular and efficient method for cloning multigene plasmids containing only a single cloning step without the use of preliminary single-gene vectors is reported. In the first step, PCR-produced DNAblocks carrying genes for different antibody chains are ligated with the respective adaptors, which serve as connectors of the different DNAblocks. In the second step, the PCR-produced fragments of the first step are assembled in the correct arrangement via the unique recombination sites located at one end of each backbone, DNAblock and adaptor fragment. This new strategy results in a modular and efficient method, which allows direct cloning of expression cassettes into the respective backbone without intermediate cloning steps and enable fast cloning of variable gene configurations of diverse antibody formats. This new cloning method according to the current invention provides considerable advantages in terms of time, work labor and costs.