Automated Workflow Compilation for Multi-Target Instrument Scheduling
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Solution Overview
Problem
Current methods for synthesizing transcription activator-like effector nuclease (TALEN) pairs are inefficient, requiring separate vectors or lengthy subcloning procedures, limiting high-throughput construction and scalability in biological foundries.
Innovation Solution
A single-step assembly scheme using a P2A self-cleavage sequence to synthesize and express TALEN pairs in a single transcript format, implemented on a fully automated platform like iBioFAB, enabling the production of 400 pairs of TALENs with high success rate and reduced material cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate vectors or subcloning procedures are used for TALEN pair synthesis, then cleavage activity is achieved, but the synthesis process is lengthy and difficult to scale for high-throughput construction
Solution Approach 1:
The patent merges the synthesis of two separate TALEN monomers into a single Golden Gate assembly reaction. By designing the assembly system to accommodate multiple DNA fragments (including both TALEN monomers, linkers, and T2A sequences) in one pot, the method eliminates the need for separate subcloning steps, thereby increasing throughput and simplifying the synthesis process while maintaining cleavage activity
Solution Approach 2:
The patent segments the TALEN expression cassette into modular components (TALEN monomers, linkers, T2A sequences) that can be independently designed and assembled. This segmentation allows for standardized assembly protocols where pre-designed modules are combined in a single reaction, enabling high-throughput synthesis without complex procedures
2Reliability
If dual vector systems are used to introduce TALEN monomers, then heterodimeric TALEN function is achieved, but the number of vectors and cells required doubles, reducing efficiency
Solution Approach 1:
The patent combines both TALEN monomers into a single expression vector using a single Golden Gate assembly reaction. The vector contains both monomer coding sequences flanked by appropriate linkers and T2A self-cleavage sequences, allowing co-expression from one plasmid. This eliminates the need for dual vector transfection, doubling transfection efficiency while ensuring proper heterodimer formation through controlled stoichiometry
Solution Approach 2:
The patent uses T2A self-cleavage sequences as intermediaries to separate the two TALEN monomers at the protein level while maintaining their presence in a single transcript. The T2A peptide mediates ribosomal skip events that cause self-cleavage, releasing individual monomers from the polycistronic transcript, thereby ensuring functional heterodimer production from a single vector
3Manufacturing precision
If traditional subcloning procedures are used for TALEN vector construction, then precise TALEN assembly is achieved, but the process is lengthy and requires significant human intervention
Solution Approach 1:
The patent replaces traditional mechanical subcloning procedures (ligation, transformation, screening) with a biochemical assembly system based on Golden Gate cloning. This system uses type IIS restriction enzymes that cut outside their recognition sites, allowing precise assembly of DNA fragments in a single reaction with directional cloning. The reaction conditions and enzyme specificity ensure high precision assembly while completing the process in hours rather than days, reducing human intervention requirements
4Reliability
If multiple vectors are synthesized for TALEN pairs, then complete TALEN functionality is achieved, but material costs and synthesis complexity increase
Solution Approach 1:
The patent combines the synthesis of both TALEN monomers into a single vector synthesis reaction. By designing the Golden Gate assembly to incorporate both monomers, linkers, and regulatory elements in one reaction, the method reduces material consumption (reagents, templates, controls) and associated costs while maintaining complete TALEN functionality through verified assembly protocols
Data Source
AI summary
Systems and methods for automated workflow comprise assigning a set of first targets to an uncompiled first workflow. The uncompiled first workflow specifies a first set of process modules. Each such module is associated with a subset of unit operations. Each unit operation includes a time interval and specifies an instrument. For each target in the set of first targets, the uncompiled workflow is translated into an instance of a compiled first workflow comprising a linear temporal order of unit operations, each including execution instructions for an addressed instrument. A set of second targets is obtained and assigned a second uncompiled workflow. Compilation of the second uncompiled workflow for each second target produces a different instance of a compiled second workflow. Each second compiled workflow comprises a linear temporal order of unit operations, with each unit operation including execution instructions for an addressed instrument and specifying a time interval.