Effector Domain Libraries for High-Throughput Gene Regulation
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Solution Overview
Problem
Existing methods for engineering synthetic transcription factors are limited by a small toolbox of effector domains, lacking the ability to efficiently identify and characterize transcriptional activator and repressor domains in a high-throughput manner.
Innovation Solution
A high-throughput system is developed to identify and characterize effector domains by preparing a domain library, transforming reporter cells with a two-part reporter, treating cells with an agent to induce DNA binding, separating cells based on reporter expression, and sequencing protein domains to identify transcriptional activators or repressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional methods are used to engineer synthetic transcription factors, then the process is simple and straightforward, but the toolbox of effector domains remains limited and small
Solution Approach 1:
The system divides the identification process into distinct functional modules: a domain library containing multiple effector domains, a reporter system with separable markers, and a high-throughput screening platform. This segmentation allows independent optimization of each component while expanding the overall toolbox capacity.
Solution Approach 2:
The patent introduces a two-part reporter system as an intermediary between the effector domains and the detection mechanism. This reporter comprises a first marker gene and a second marker gene with different detection methods, enabling indirect but scalable measurement of transcriptional activity without directly complicating the effector domain structure.
2Productivity
If high-throughput identification methods are implemented, then the number of effector domains discovered increases significantly, but the complexity of the identification system increases
Solution Approach 1:
The two-part reporter system serves multiple functions simultaneously: it reports transcriptional activation, enables cell sorting via surface markers, and provides fluorescent readout for verification. This multi-functionality achieves high throughput without proportionally increasing system complexity.
Solution Approach 2:
The system replaces complex biochemical assay mechanisms with physical separation methods (FACS or magnetic sorting) based on surface marker expression. This substitution simplifies the detection mechanism while enabling high-throughput processing of large domain libraries.
3Productivity
If a two-part reporter system is used with surface markers and fluorescent proteins, then cells can be manipulated and sorted in multiple ways increasing throughput, but the complexity of the reporter system increases
Solution Approach 1:
The reporter is segmented into two independently detectable marker genes, each with distinct detection modalities (surface marker for physical sorting, fluorescent protein for optical verification). This segmentation enables parallel processing pathways that multiply throughput without requiring a single overly complex detection system.
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 expands the toolbox of effector domains, enabling the discovery of hundreds of domains that can regulate gene expression, facilitating applications in gene and cell therapy, synthetic biology, and functional genomics.
Implementation Method 1
treating reporter cells with the agent for a length of time necessary for protein and mRNA degradation in the cell
Implementation Method 2
separating reporter cells based on presence or absence of the surface marker, the fluorescent protein, or a combination thereof
Data Source
Figure 1A~1B
Figure 1C
Figure 1D~1E
AI summary
Provided herein are compositions, systems, and methods for the generation, identification, and characterization of effector domains for activating and silencing gene expression. In particular, high throughput systems are provided to discover and characterize effector domains.