通过CRISPR/Cas9-介导的间歇性大基删除生成单体21q人类iPS细胞
Masaya Egawa1, Narumi Uno1, Rina Komazaki1
1Laboratory of Bioengineering, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan.
Genes to cells : devoted to molecular & cellular mechanisms
|November 24, 2024
概括
研究人员创造了一种新方法,在人类干细胞中产生部分单体,使得染色体损失效应的研究成为可能. 这一突破提供了第一个具有完整21q单体的人类iPSC线,不显示任何剂量补偿.
科学领域:
- 遗传学 遗传学是一种遗传学.
- 干细胞生物学 干细胞生物学
- 基因组学就是基因组学.
背景情况:
- 二倍体细胞中的染色体损失会影响细胞活力,并导致出生缺陷.
- 由于缺乏合适的模型系统,研究人类细胞中染色体损失的影响具有挑战性.
研究的目的:
- 开发一种高效,无选择的方法,在人类诱导多能干细胞 (iPSCs) 中产生部分单体.
- 创建第一个表现出完整21q单体的人类iPSC系.
- 为了研究染色体损失对基因表达和细胞健康的影响.
主要方法:
- 利用Cas9蛋白和指导RNA (gRNAs) 来诱导人类iPSC中的大型间歇性染色体删除.
- 产生了部分单体21q (PM21q) iPSC线,删除范围为4.5至33.6Mb.
- 进行了转录组和蛋白质组分析,以评估基因表达水平.
主要成果:
- 在21q染色体上成功生成了部分和完全删除的iPSC线.
- 证明单体区域内的基因表现出大约一半的双体表达水平.
- 证实在生成的单体细胞系中没有剂量补偿.
结论:
- 开发的方法允许在同位素背景上创建定制的部分单体细胞系.
- 这些iPSC模型为细胞染色体损失的细胞后果提供了新的见解.
- 这些发现凸显了部分或完全丢失染色体臂的人类细胞中缺乏剂量补偿的现象.
相关概念视频
01:59CRISPR
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 Short...
01:28CRISPR/Cas9 Genome Editing
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...