相关实验视频
Updated: Jun 15, 2025

Techniques to Induce and Quantify Cellular Senescence
Published on: May 1, 2017
通过IRTKS凝聚剂形成和重塑异色染色素,抵消细胞衰老
Jia Xie1, Zhao-Ning Lu1, Shi-Hao Bai1
1Key Laboratory of Systems Biomedicine (Ministry of Education) and State Key Laboratory of Medical Genomics, National Research Center for Translational Medicine at Shanghai, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai, 200240, China.
胰岛素受体氨酸激酶基质 (IRTKS) 通过液-液相分离驱动 heterochromatin 的形成. 缺少IRTKS会破坏基因组的稳定性,激活衰老路径.
科学领域:
- 表观遗传学和分子生物学
- 细胞生物学和生物化学
背景情况:
- 异种染色素对于真核细胞中的基因组稳定性和基因调节至关重要.
- 控制异色染色体形成和维持的机制尚未完全理解.
研究的目的:
- 调查胰岛素受体氨酸激酶基质 (IRTKS) 在异色素蛋白的形成和维持中的作用.
- 阐明IRTKS影响异色素蛋白结构和功能的分子机制.
主要方法:
- 使用液体液相分离 (LLPS) 试验来研究IRTKS的行为.
- 研究了IRTKS与HP1α和Ubc9.9的相互作用.
- 在IRTKS缺陷时分析了染色质可访问性和基因表达的变化.
- 评估了对cGAS-STING,IFN-I信号和细胞衰老的影响.
主要成果:
- 通过LLPS,IRTKS对于构成性异色素蛋白的形成至关重要.
- 通过Ubc9-介导的SUMOylation,IRTKS稳定HP1α,促进更大的相隔滴.
- 缺少IRTKS会导致异性染色质的损失,增加染色质的可访问性和异常转录.
- 失去IRTKS会激活cGAS-STING,IFN-I信号,并诱导细胞衰老和SASP.
结论:
- 通过LLPS,IRTKS在巩固构成性异染色素方面发挥着关键的调解作用.
- 在保持基因组稳定性和防止异常信号传递方面,IRTKS起着至关重要的作用.
- IRTKS作为一种表观遗传调节剂,将异色素蛋白完整性与细胞衰老联系起来.
更多相关视频
13:59A Quantitative Measurement of Reactive Oxygen Species and Senescence-associated Secretory Phenotype in Normal Human Fibroblasts During Oncogene-induced Senescence
Published on: August 12, 2018
08:18Induction and Validation of Cellular Senescence in Primary Human Cells
Published on: June 20, 2018
相关概念视频
Chromatin Modification in iPS Cells
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Replicative Cell Senescence
Inheritance of Chromatin Structures
Heterochromatin
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Nucleosome Remodeling
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Replication in Eukaryotes
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...