在基切除修复中MYC的功能可以保护RAS诱导的衰老
Camila C F Faraco1,2, Wanting Zhu1,3, Anne-Marie Fortier1
1Goodman Cancer Institute, McGill University, Montreal, H3A 1A3, Quebec, Canada.
Nucleic acids research
|July 30, 2025
概括
MYC瘤基因通过与DNA聚合酶β相互作用来防止癌细胞衰老,以增强DNA修复. 这种机制对于MYC-RAS在推动瘤发展方面的合作至关重要.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- MYC和RAS瘤基因在细胞转化和瘤发育中进行合作.
- MYC可以防止RAS诱导的衰老,这是瘤进展的关键因素.
- MYC防止衰老的确切机制以及MYC抑制如何诱导衰老,尚未完全理解.
研究的目的:
- 阐明MYC在预防RAS诱导衰老中的作用.
- 研究MYC在细胞增殖和DNA修复中的功能背后的分子机制.
- 确定MYC的DNA修复活动在MYC-RAS合作中的重要性.
主要方法:
- 研究了MYC和Pol β DNA聚合酶之间的相互作用.
- 评估了MYC对基础切除修复 (BER) 途径的影响.
- 使用了缺乏特定域的MYC突变 (例如,MYCΔCTD) 和DNA修复不活跃的突变.
- 研究了RAS诱导的衰老和细胞转化对原始细胞的影响.
主要成果:
- MYC与Pol β直接相互作用,增强其在通过BER修复氧化DNA损伤中的酶活性.
- 这种MYC介导的DNA修复使得RAS驱动的癌细胞能够绕过衰老,尽管反应性氧物种水平很高.
- 在MYC的碳氧终端域是不可或缺的,因为它的DNA修复功能.
- 缺少DNA修复的MYC突变体表现出减少或完全没有预防衰老或与RAS合作的能力.
结论:
- 在基切除修复途径中MYC的功能对于其预防RAS诱导衰老的能力至关重要.
- MYC介导的DNA修复是MYC和RAS在癌症发展中的合作的关键机制.
- 针对MYC的DNA修复功能可能为MYC-RAS驱动的癌症提供新的治疗策略.
相关概念视频
Base Excision Repair
23.0K
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...
23.0K
Nucleotide Excision Repair
3.8K
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...
3.8K
Abnormal Proliferation
4.6K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.6K
The Ras Gene
6.4K
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a...
Ras is a...
6.4K
Long-patch Base Excision Repair
7.2K
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:
7.2K
DNA Damage can Stall the Cell Cycle
9.3K
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...
9.3K


