Engineered Cascade Complexes for Precise Genome Editing
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Solution Overview
Problem
Current CRISPR-Cas systems face limitations in editing efficiency and fidelity, necessitating improvements for effective genome editing.
Innovation Solution
Engineered Type I CRISPR-Cas effector complexes are developed, comprising specific subunit proteins and guide polynucleotides with linker polypeptides, and fusion proteins with FokI, to enhance targeting precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current CRISPR-Cas systems are used for genome editing, then basic targeting capability is achieved, but editing efficiency and fidelity are insufficient
Solution Approach 1:
The patent segments the CRISPR-Cas system into multiple independently expressed subunit proteins (Cas5, Cas6, Cas7, Cas8, Cse2) that self-assemble to form the effector complex. This segmentation allows for optimized expression and assembly of each component, improving both editing efficiency and fidelity through controlled complex formation.
Solution Approach 2:
The patent combines multiple Cas subunit proteins with guide polynucleotides to form a unified effector complex that integrates targeting (guide RNA) and catalytic (Cas proteins) functions. This merging creates a coordinated system where all components work together to achieve precise and efficient genome editing.
2Measurement precision
If CRISPR-Cas systems are engineered with multiple subunit proteins and fusion proteins, then targeting precision is improved, but system complexity increases
Solution Approach 1:
The system divides the CRISPR-Cas machinery into discrete, modular subunit proteins (Cas5, Cas6, Cas7, Cas8, Cse2) that can be independently optimized and assembled. This segmentation enables precise control over complex formation and targeting while maintaining manageable system architecture through defined subunit interactions.
Solution Approach 2:
The engineered effector complex integrates multiple functions within a single assembly: guide polynucleotide binding, target DNA recognition, and catalytic activity. This multi-functionality reduces the need for separate systems while improving targeting precision through coordinated action of all components.
Data Source
AI summary
The present disclosure provides engineered Class 1 Type I CRISPR-Cas (Cascade) systems that comprise multi-protein effector complexes, nucleoprotein complexes comprising Type I CRISPR-Cas subunit proteins and nucleic acid guides, polynucleotides encoding Type I CRISPR-Cas subunit proteins, and guide polynucleotides. Also, disclosed are methods for making and using the engineered Class 1 Type I CRISPR-Cas systems of the present invention.