Mutant TcBuster Transposase for Genome Editing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current DNA transposon systems for genome editing in human cells have limitations in transposition efficiency and delivery methods, particularly for hAT family transposons, which affect their ability to efficiently integrate transposons into target genomic locations.
Innovation Solution
Development of a mutant TcBuster transposase with specific amino acid substitutions that increase net charge, combined with a fusion transposase incorporating additional Nuclear Localization Signals and DNA sequence-specific binding domains, to enhance transposition efficiency and targeted integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type TcBuster transposase is used, then the system maintains natural sequence, but transposition efficiency is limited
Solution Approach 1:
The patent applies parameter changes by systematically mutating amino acid residues in the TcBuster transposase sequence, specifically changing charged residues to increase net positive charge. This modifies the physical-chemical parameters of the transposase protein to enhance its interaction with DNA and improve transposition efficiency while maintaining functional integrity.
Solution Approach 2:
The patent applies local quality by making specific localized amino acid substitutions in key regions of the transposase protein, such as the DNA-binding domain and catalytic domain, rather than uniform changes throughout the sequence. This targeted approach enhances transposition efficiency in critical functional regions while preserving overall protein structure and function.
2Productivity
If transposase activity is increased through mutations, then transposition efficiency improves, but specificity and targeted integration may be reduced
Solution Approach 1:
The patent applies segmentation by separating the transposase function into two distinct components: a mutated TcBuster transposase that provides enhanced catalytic activity and transposition efficiency, and a separate DNA-binding domain (such as zinc fingers or TALEs) that provides sequence-specific targeting. This modular approach allows independent optimization of both efficiency and specificity.
Solution Approach 2:
The patent applies merging by fusing the mutated TcBuster transposase with sequence-specific DNA-binding domains to create a hybrid enzyme that combines high catalytic activity with precise targeting capability. This fusion allows the system to achieve both improved transposition efficiency and maintained or enhanced specificity for targeted genomic locations.
3Productivity
If nuclear localization is enhanced, then cellular uptake and nuclear delivery improve, but protein size and complexity increase
Solution Approach 1:
The patent applies the intermediary principle by incorporating nuclear localization signals (NLS) as separate functional modules that act as mediators to facilitate nuclear import of the transposase protein. These NLS sequences serve as intermediaries that interact with the nuclear import machinery, enabling efficient nuclear delivery without requiring fundamental changes to the core transposase structure.
Data Source
AI summary
This disclosure provides various TcBuster transposases and transposons, systems, and methods of use.