在APOBEC3A介导的复制应激过程中,SMC5/6复合物防止了基因毒性
Dylan F Fingerman1,2, David R O'Leary1,2, Ava R Hansen1,2,3
1Department of Pediatrics, Washington University School of Medicine, St. Louis, MO, USA.
The EMBO journal
|June 17, 2024
概括
染色体5/6 (SMC5/6) 结构维护复合体对于当APOBEC3A导致DNA损伤时细胞生存至关重要. SMC5/6 功能障碍阻止了 APOBEC3A 突变发生,揭示了潜在的癌症治疗标.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- APOBEC3 氨酸脱氨酶,特别是APOBEC3A,与癌症突变和DNA损伤有关.
- 维持对APOBEC3A活动的基因组稳定性的机制在很大程度上是未知的.
研究的目的:
- 在活跃的APOBEC3A.的存在下,确定基因组稳定所必需的细胞因素.
- 为了研究5/6染色体 (SMC5/6) 结构维护复合物的作用,以应对APOBEC3A诱导的DNA损伤.
主要方法:
- 无偏见的全基因组查,以识别活性APOBEC3A的细胞活力至关重要的基因.
- 分析不同SMC5/6功能的人类瘤中APOBEC3A突变发生的模式.
- 在APOBEC3A活动下,评估具有或没有SMC5/6功能的细胞中的DNA复制动态和DNA断裂.
主要成果:
- 当APOBEC3A活跃时,SMC5/6复合体被确定为细胞活力的关键.
- 在SMC5/6功能障碍的人类瘤中缺少APOBEC3A突变,这表明合成致死性.
- APOBEC3A活动导致依赖PrimPol的复制通道延长,表明DNA损伤和重新启动.
- 失去了SMC5/6功能加剧了DNA断裂,并取消了在APOBEC3A活动时复制通道的延长.
结论:
- 复制分叉延长是对APOBEC3A活动的DNA损伤反应,通过SMC5/6.6促进基因组稳定性.
- SMC5/6对于管理APOBEC3A诱导的DNA损伤和保持基因组完整性至关重要.
- 在具有高APOBEC3A活性的癌症中,SMC5/6代表了潜在的治疗脆弱性.
更多相关视频
07:37Author Spotlight: Unraveling the Dynamics of Eukaryotic DNA Replication Through Single-Molecule Visualization
Published on: September 27, 2024
1.5K
12:19Tools to Study the Role of Architectural Protein HMGB1 in the Processing of Helix Distorting, Site-specific DNA Interstrand Crosslinks
Published on: November 10, 2016
8.3K
相关概念视频
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
Homologous Recombination
50.4K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
50.4K
Mismatch Repair
4.8K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.8K
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
S-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
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
