TRIM24指导复制性应激反应通过染色体信号传递来维持ALT端粒
bioRxiv : the preprint server for biology
|October 28, 2024
概括
科学家们开发了BLOCK-ID来研究基因组复制压力. 他们发现TRIM24蛋白对于癌症中的端粒替代延长 (ALT) 至关重要,通过一种新的染色体信号通路协调端粒合成.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 癌症生物学 癌症生物学
背景情况:
- 基因组复制压力和不稳定性与疾病有关.
- 了解压力复制叉中的蛋白质对于治疗开发至关重要.
- 端粒的替代延长 (ALT) 是一种维持端粒长度的癌症特异性途径.
研究的目的:
- 开发一种蛋白质学方法 (BLOCK-ID) 用于在应力复制分叉中识别蛋白质.
- 为了确定复制应激反应的新媒体.
- 阐明TRIM24在ALT通路和端粒维护中的作用.
主要方法:
- 开发BLOCK-ID,一种蛋白质组技术.
- 蛋白质组分析以识别在应激复制分叉中的蛋白质.
- 在癌细胞中对TRIM24的功能验证,包括它在ALT中的作用.
主要成果:
- BLOCK-ID成功地确定了新的复制应激反应调解者.
- TRIM24是一种染色素乙化读取器,被确定为一个关键蛋白质.
- TRIM24通过通过p300/CBP依赖的乙化级联在端粒上组织ALT相关的PML体 (APB) 来协调ALT.
- TRIM24可以独立地以SUMO-依赖的方式刺激端粒DNA合成.
结论:
- 在癌症中,TRIM24在协调ALT通路以维持端粒的过程中起着至关重要的作用.
- 一个新的TRIM24依赖的染色体信号通路对于ALT.至关重要.
- TRIM24在端粒上的依赖于SUMO的活性为端粒合成调节提供了新的见解.
相关概念视频
Telomeres and Telomerase
23.1K
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
23.1K
Replication in Eukaryotes
13.3K
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...
13.3K
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
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
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
35.6K
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...
35.6K


