通过CRISPR/Cas9介导的插座基因转换来有效修复人类遗传缺陷
Fei Yang1,2, Yiyun Wang3, Qiudao Wang1
1Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai 200241, China.
Life medicine
|January 28, 2025
概括
克里斯普尔/基因转换 (GC) 通过使用内部DNA模板,有效地纠正血造干细胞中的β-血症突变. 这种新的方法避免了有毒的合成DNA,为遗传疾病提供了有前途的基因疗法.
科学领域:
- 分子生物学分子生物学
- 基因治疗 基因治疗
- 血液学 血液学 血液学
背景情况:
- 通过非同源端连接 (NHEJ) 或同源导向修复 (HDR) 来修复DNA双链断裂 (DSB).
- HDR提供精确的基因校正,但面临着外源DNA模板毒性和低效率的挑战.
- NHEJ可以在目标位置引入不需要的插入/删除 (indels).
研究的目的:
- 使用CRISPR/Cas9介导基因转换 (CRISPR/GC) 开发一种有效的β-thalassemia基因校正策略.
- 为了利用内源的仿制基因HBD作为HDR的内部模板,绕过外源DNA的需求.
主要方法:
- 使用CRISPR/Cas9介导基因转换 (CRISPR/GC) 来准HBB基因中的病原性突变.
- 类似基因HBD被用作同质导向修复的内部模板.
- 已编辑的造血干细胞 (HSCs) 被移植以评估重新填充和治疗疗效.
主要成果:
- 在没有外源DNA模板的HSC中,CRISPR/GC成功修复了致病性HBB突变.
- 移植的编辑HSCs重新填充了造血系统,并产生了减少血病的红色素细胞.
- 导致β-thalassemia的多种致病突变被精确地纠正到野生类型的序列.
结论:
- 使用内部基因模板的CRISPR/GC为基因治疗提供了一个强大的替代传统HDR.
- 这种模板独立的方法在治疗诸如β-thalassemia之类的遗传疾病方面显著有前途.
- 该方法克服了与外源DNA传递和HDR效率相关的局限性.
更多相关视频
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
7.7K
10:07Construction of Homozygous Mutants of Migratory Locust Using CRISPR/Cas9 Technology
Published on: March 16, 2022
2.0K
相关概念视频
02:31Homologous Recombination
50.1K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
50.1K
01:59CRISPR
49.2K
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...
49.2K
02:08Gene Conversion
9.6K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
9.6K
02:53Conservative Site-specific Recombination and Phase Variation
5.9K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
5.9K