相关实验视频
Updated: Jul 11, 2025
06:53
Quantification of γH2AX Foci in Response to Ionising Radiation
Published on: April 6, 2010
20.5K
γH2AX在复制应激诱导癌症发生中的作用:可能的联系和最近的发展
Michalis Fragkos1, Maria Choleza1, Paraskevi Papadopoulou1
1Department of Science and Mathematics, Deree-The American College of Greece, Athens, Greece.
Cancer diagnosis & prognosis
|November 6, 2023
概括
基因组H2AX酸化 (γH2AX) 对于DNA修复和复制应激反应至关重要. 新发现表明,gH2AX在解决停滞的复制分叉方面发挥了新角色,独立于DNA断裂修复,提供了潜在的癌症治疗目标.
科学领域:
- 癌症中的基因组不稳定性和染色体异常.
- DNA损伤反应和癌症发生.
- 细胞复制周期调节. 细胞复制周期调节.
背景情况:
- 由于细胞周期不完全完成而引起的复制应激是DNA损伤和癌症的主要原因.
- 酸化组合素H2AX (γH2AX) 对于DNA损伤反应和修复因子组合至关重要.
- γH2AX也标记了复制应力,但其在这种情况下的确切功能尚不清楚.
研究的目的:
- 审查最近在理解复制应激方面的进展.
- 为了突出一个新的,DNA损伤独立的功能 γH2AX 响应复制压力.
- 探索γH2AX在解决停滞的复制分叉中的作用及其在癌症中的治疗潜力.
主要方法:
- 关于复制应激和γH2AX的当前文献的综述.
- 对研究分析研究的分析,研究 γH2AX 在复制应激反应的早期作用.
- 检查数据,建议γH2AX作为染色质重塑组件.
主要成果:
- 有证据表明,γH2AX参与了对复制应激的早期反应,但没有直接修复DNA断裂.
- γH2AX被认为是解决停滞不前的复制分叉所必需的染色质重塑因子.
- 这种γH2AX的功能与其在DNA双链断裂修复中的既定作用不同.
结论:
- γH2AX在通过超出DNA修复的机制从复制压力中恢复细胞中发挥着关键作用.
- 了解γH2AX在解决停滞叉的功能可能会导致新的癌症生物标志物.
- 向γH2AX介导途径可能为癌症治疗提供新的治疗策略.
相关概念视频
01:02The DNA Replication Fork
36.0K
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...
36.0K
02:37DNA Damage can Stall the Cell Cycle
9.2K
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...
9.2K
01:38Nucleotide Excision Repair
3.5K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.5K
02:37Restarting 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
02:38S-Cdk Initiates DNA Replication
4.7K
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
4.7K
00:55DNA Helicases
21.4K
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
21.4K