基切除修复途径调节了胰腺管道腺癌中的转录复制冲突
Fan Meng1, Tiane Li2, Anup K Singh3
1Department of Surgery, City of Hope National Medical Center, Duarte, CA, USA.
Cell reports
|October 5, 2024
概括
转录复制冲突 (TRCs) 在胰腺癌中常见,原因是瘤突变. 抑制基切割修复 (BER) 途径可增强TRC和DNA损伤,为胰腺管腺癌 (PDAC) 提供潜在的治疗策略.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 癌症研究 癌症研究
背景情况:
- 瘤基因突变,如KRAS中的突变,破坏正常的细胞过程,导致转录复制冲突 (TRCs).
- TRCs与癌症的发展和进展有关,但它们在胰腺管腺癌 (PDAC) 中的特定作用需要进一步阐明.
研究的目的:
- 调查TRCs在人类胰腺管道腺癌 (PDAC) 的患病率和调控.
- 确定PDAC中TRC的关键调节者,并探索针对这些途径的潜在治疗策略.
主要方法:
- 对TRC丰富PDAC与其他癌症和正常细胞的比较分析.
- siRNA查以确定PDAC细胞中调节TRCs的因素.
- 药理上抑制基切割修复 (BER) 路径和ATR-Chk1路径.
主要成果:
- 与其他固体瘤和正常细胞相比,TRCs在人类PDAC中具有显著的丰富性.
- 基切除修复 (BER) 途径被确定为PDAC中TRC的关键调节器.
- 抑制BER通路组件 (甲氧胺,CRT) 加剧了TRC和改变了RNA聚合酶II (RNAPII) 和R循环动态.
- 联合抑制ATR (VX970) 和BER (甲胺) 协同增加了DNA损伤和减少了PDAC细胞增殖.
结论:
- 在PDAC中,TRCs是瘤基因依赖的,并且非常普遍.
- 在PDAC中,BER路径在管理TRC中起着至关重要的作用.
- 针对BER通路,与ATR抑制剂结合,为PDAC治疗提供了一个有前途的治疗途径.
相关概念视频
Base Excision Repair
22.1K
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
22.1K
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
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
Long-patch Base Excision Repair
7.0K
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
7.0K
Nucleotide 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
Homologous Recombination
50.3K
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...
50.3K


