持续结合非切除的DNA损伤的TFIIH会导致细胞和发育失败
Alba Muniesa-Vargas1, Carlota Davó-Martínez1, Cristina Ribeiro-Silva1
1Department of Molecular Genetics, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3015 GD, Rotterdam, The Netherlands.
Nature communications
|April 25, 2024
概括
核酸切除修复 (NER) 的缺陷导致疾病. 由于ERCC1-XPF或XPG损失,长时间的TFIIH与DNA损伤结合,与疾病严重程度相关,并导致发育问题.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 先天性核酸切除修复 (NER) 缺陷导致易患癌症和孕激素疾病.
- 尽管相同的DNA修复途径存在缺陷,但不同的疾病特征和严重程度仍然不清楚.
研究的目的:
- 调查NER缺陷疾病中差异性疾病表现的基础分子机制.
- 为了确定转录因子II H (TFIIH) 在疾病发病过程中的作用.
主要方法:
- 使用了人类细胞系和体内C. elegans模型.
- 分析了TFIIH与DNA损伤的结合动态.
- 评估了NER因子耗尽对TFIIH结合和细胞表型的影响.
- 研究了转录合NER的作用.
主要成果:
- 缺少ERCC1-XPF或XPG导致长时间的TFIIH与DNA损伤结合,与疾病严重程度相关,并诱导衰老.
- 在C. elegans中,持续的TFIIH与未修复的DNA损伤结合会导致发育停滞和神经元功能障碍.
- NER因子XPA和TTDA稳定TFIIH-DNA结合;它们的耗尽减轻了严重的表型.
结论:
- 停滞的NER中间体,特别是长期TFIIH与DNA损伤的接触,对细胞功能和生物体发育具有病原性.
- 这种机制部分解释了在影响不同NER因子的突变中观察到的独特疾病特征 (例如,XPG/XPF与XPA/TTDA).
更多相关视频
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
Translesion DNA Polymerases
10.0K
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
10.0K
General Transcription Factors
5.3K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
5.3K
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
Fixing Double-strand Breaks
12.6K
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
12.6K
Overview of DNA Repair
31.0K
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Chemically...
31.0K


