相关实验视频
Updated: Jun 19, 2025

06:48
CD Spectroscopy to Study DNA-Protein Interactions
Published on: February 10, 2022
6.7K
基因分叉重塑蛋白,Zranb3和Smarcal1,对于衰老的造血是独一无二的必要
Saul Kushinsky1, Matthew V Puccetti1,2, Clare M Adams1
1Department of Pharmacology, Physiology, and Cancer Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.
Aging cell
|July 24, 2024
概括
两个蛋白质,Zranb3和Smarcal1,保护造血干细胞和前代细胞 (HSPCs) 在终身造血过程中免受DNA损伤. 它们的独特作用是预防与衰老相关的血液系统疾病.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
- 血液学 血液学 血液学
背景情况:
- 造血干细胞和原始细胞 (HSPCs) 在一生中经历持续的增殖,以维持血细胞的生产.
- 这种广泛的增殖增加了对DNA复制压力的敏感性,可能导致与衰老相关的造血失调.
- 缓解这种压力并保护HSPC复制的蛋白质在很大程度上是未知的.
研究的目的:
- 研究染色体重塑酶Zranb3和Smarcal1在保护HSPCs免受复制压力的作用.
- 确定Zranb3和Smarcal1在不同HSPC群体中的不同功能,以及它们对随着衰老的血液形成的影响.
主要方法:
- 使用了具有Zranb3和Smarcal1.1遗传缺陷的小鼠模型.
- 进行骨髓移植试验,以评估长期的造血干细胞功能.
- 分析了年轻和老年小鼠的DNA损伤,复制压力和造血细胞群.
主要成果:
- 兹兰比3缺乏导致早期的造血异常,加快了骨髓偏差衰老,与累积的DNA损伤有关.
- 斯马卡尔1缺乏主要损害原始细胞功能,导致因衰老而加剧的淋巴细胞偏差.
- 结合Zranb3和Smarcal1的损失加剧了HSPC缺陷,揭示了复制叉动态中的年龄和压力依赖可塑性.
结论:
- Zranb3和Smarcal1是必不可少的,进化保守的酶,在保护HSPC免受复制压力时具有专门的细胞内在作用.
- 这些蛋白质对于维持造血平衡和通过不同的机制预防与年龄相关的血液系统失调至关重要.
相关概念视频
Restarting Stalled Replication Forks
5.8K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.8K
The DNA Replication Fork
35.8K
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
35.8K
Nucleosome Remodeling
9.1K
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
9.1K
DNA Damage can Stall the Cell Cycle
9.1K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.1K
Replicative Cell Senescence
3.6K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.6K
Replication in Eukaryotes
13.6K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
13.6K

