Multi-NLS Zinc Finger Nuclease for Non-Dividing Cell Editing
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Solution Overview
Problem
Existing genome editing technologies, particularly zinc-finger nucleases (ZFNs), are inefficient in non-dividing cells.
Innovation Solution
A zinc-finger protein (ZFP) with three or more nuclear localization signals (NLSs) at the N-terminus, specifically SV40 T antigen and/or c-myc NLSs, is used to enhance genome editing efficiency, combined with a nuclease domain like ND1, in a vector system for targeted integration in non-dividing cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ZFN without multiple NLS is used, then the structure is simpler, but the genome editing efficiency in non-dividing cells is low
Solution Approach 1:
The patent applies parameter changes by modifying the number of nuclear localization signals (NLS) attached to the zinc-finger protein from one to three or more. This quantitative change in the NLS parameter directly improves nuclear import efficiency and genome editing activity in non-dividing cells, while maintaining the overall ZFN structural framework
Solution Approach 2:
The patent creates a composite protein structure by combining multiple NLS sequences with the zinc-finger protein domain. This composite construction allows the ZFN to simultaneously maintain its DNA-binding function while gaining enhanced nuclear localization capability through the multiplexed NLS signals
2Productivity
If multiple NLS are added to ZFP, then the genome editing efficiency in non-dividing cells improves, but the protein structure becomes more complex
Solution Approach 1:
The patent systematically varies the number of NLS copies (comparing 1×, 2×, and 3× NLS configurations) to optimize genome editing efficiency. The experimental data shows that 3× NLS configuration achieves the highest editing efficiency in non-dividing cells, demonstrating parameter optimization through quantitative modification
3Adaptability or versatility
If ZFN is used in non-dividing cells, then the applicability to therapeutic targets improves, but the genome editing efficiency is low
Solution Approach 1:
The patent addresses the inefficiency of ZFN in non-dividing cells by changing the NLS parameter from single to multiple copies. This modification enables the ZFN to effectively target and edit genes in non-dividing cells such as photoreceptor cells, expanding the applicability to clinically relevant therapeutic targets while restoring high editing efficiency
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
The ZFP with multiple NLSs significantly improves genome editing efficiency in non-dividing cells, enabling precise and efficient insertion of foreign genes using the Homology-independent Targeted Integration (HITI) method.
Implementation Method 1
the addition of multiple nuclear localization signals (NLSs) to ZF-FokI-ND improves the genome editing efficiency in cultured cells
Data Source
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AI summary
The present invention provides a zinc-finger nuclease (ZFN) having three or more nuclear localization signals (NLSs) at the N-terminus as a technology that can be used to increase, particularly in non-dividing cells, the efficiency of genome editing using ZFNs.