Combinatorial CRISPR Vector Generation for Library Complexity
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Solution Overview
Problem
The generation of vectors and genetic elements for multiple CRISPR systems comprising multiple sgRNAs is laborious, and traditional cloning methods limit the complexity of CRISPR libraries.
Innovation Solution
The development of genetic constructs and methods for generating combinatorial vectors with concatenated CRISPR guide and scaffold sequences, using compatible end elements and barcode elements, allows for rapid and complex library generation, enabling efficient screening and targeting of nucleic acids in host cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional cloning methods are used to generate vectors with multiple CRISPR systems, then the process is simpler and more straightforward, but the generation becomes laborious and the library complexity is limited
Solution Approach 1:
The vector is divided into multiple independent modules, each containing a CRISPR system with its own promoter, guide RNA, and scaffold RNA. These modular units can be independently designed, synthesized, and then assembled through standardized cloning interfaces, enabling rapid generation of complex multi-CRISPR vectors without laborious traditional cloning for each individual system
Solution Approach 2:
A universal cloning framework is established with standardized restriction sites and promoter elements that can accommodate multiple different CRISPR systems. This universal interface allows diverse CRISPR components to be integrated using the same cloning protocol, dramatically increasing library generation productivity while maintaining ease of manufacture
2Ease of manufacture
If traditional cloning methods are used to generate vectors with multiple CRISPR systems, then the process is more straightforward, but the library complexity is very limited
Solution Approach 1:
Multiple CRISPR systems are nested within a single vector backbone, with each system contained in its own modular cassette. This nesting approach allows complex libraries with numerous different CRISPR combinations to be generated from a single parental vector through iterative cloning, achieving high library complexity while maintaining the simplicity of standardized cloning procedures
Solution Approach 2:
The system enables combinatorial complexity by arranging CRISPR components in multiple dimensions - different promoters, different guide RNAs, and different scaffold RNAs can be combined in various configurations within the same vector framework, exponentially increasing library complexity without proportionally increasing manufacturing difficulty
3Manufacturing precision
If multiple CRISPR systems are generated using conventional methods, then each system can be individually optimized, but the generation process becomes very laborious
Solution Approach 1:
Standardized cloning interfaces and modular vector backbones are prepared in advance, with all necessary restriction sites, promoters, and selection markers pre-positioned. This preliminary setup allows multiple CRISPR systems to be rapidly assembled through simple ligation reactions, maintaining the ability to individually optimize each system while reducing the overall generation time from weeks to days
Solution Approach 2:
The system allows independent optimization of key parameters for each CRISPR component (promoter strength, guide RNA sequence, scaffold RNA structure) while using standardized cloning procedures. This decoupling of optimization parameters from the assembly process enables precise tuning of each CRISPR system without increasing the laboriousness of generating multi-CRISPR vectors
Data Source
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AI summary
Described herein are methods and compositions that enable rapid generation of high-order combinations of genetic elements comprising a CRISPR guide sequence and a scaffold sequence, and a barcode for rapid identification of the combination of genetic elements encoded within a single cell or a pooled population. Also described herein compositions of inhibitors of epigenetic genes and methods for reducing cell proliferation and/or treating cancer.