核定位信号使细胞能够输送抗CRISPR蛋白来控制基因组编辑
bioRxiv : the preprint server for biology
|November 24, 2025
概括
我们开发了6×NLS-Acr,一种细胞透的抗CRISPR蛋白 (Acr),以提高CRISPR-Cas基因组编辑精度. 这种抑制剂迅速进入细胞,显著提高编辑特异性和治疗潜力.
科学领域:
- 分子生物学分子生物学
- 生物技术是生物技术.
- 基因编辑 基因编辑
背景情况:
- 精确的Cas9调节对于最大限度地减少基因组编辑中的非目标效应和基因毒性至关重要.
- 目前的抗CRISPR蛋白 (Acrs) 由于细胞膜不透性而面临传递挑战.
- 现有的输送方法,如载体或电穿孔,对治疗应用有局限性.
研究的目的:
- 开发一种细胞透的抗CRISPR蛋白 (Acr),用于增强CRISPR-Cas基因组编辑.
- 研究新型Acr.的细胞进入机制和抑制功能.
- 评估细胞透性Acr在各种人类细胞类型中的有效性.
主要方法:
- 通过使用核定位信号 (NLSs) 设计了一个细胞透的Acr (6×NLS-Acr).
- 使用光标记可视化6×NLS-Acr细胞进入和与Cas9·gRNA复合体结合.
- 在各种人类细胞模型中测试了6×NLS-Acr转导效率和Cas9抑制,包括干细胞和3D培养.
主要成果:
- 6×NLS-Acr证明了快速的细胞转导 (5分钟内) 的IC50为0.47μM.
- 实现高达99%的Cas9活性抑制和近100%的基因组编辑特异性的增加.
- 成功将6×NLS-Acr输入各种人体细胞类型,包括干细胞和3D培养.
结论:
- 6×NLS-Acr是一种高度有效的CRISPR-Cas9活性的细胞透性抑制剂.
- 这种新型的ACR显著提高了基因组编辑的精度和特异性.
- 6×NLS-Acr对推进基于CRISPR的治疗方法具有相当大的潜力.
更多相关视频
07:23Dual CRISPR-Interference Strategy for Targeting Synthetic Lethal Interactions Between Non-Coding RNAs in Cancer Cells
Published on: May 30, 2025
1.1K
10:07A Standard Methodology to Examine On-site Mutagenicity As a Function of Point Mutation Repair Catalyzed by CRISPR/Cas9 and SsODN in Human Cells
Published on: August 25, 2017
8.3K
相关概念视频
Nuclear Localization Signals and Import
7.5K
Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
7.5K
Regulation of Nuclear Protein Sorting
3.2K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
3.2K
CRISPR/Cas9 Genome Editing
1.6K
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
1.6K
Nuclear Protein Sorting
6.2K
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
6.2K
CRISPR
57.4K
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
57.4K
Nuclear Export
4.8K
The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
NES are of three types- the canonical 10-residue long leucine-rich signal and other...
4.8K
