基因毒性C8-Arylamino-2'-deoxyadenosines作为潜伏化剂诱导DNA跨链
Aaron L Rozelle1,2, Seongmin Lee1
1Division of Chemical Biology and Medicinal Chemistry, College of Pharmacy, The University of Texas at Austin, Austin, Texas 78712, United States.
Journal of the American Chemical Society
|November 2, 2021
概括
多环芳氨酸可以在氧化应激下通过氧化8-arylamino-2'-deoxyadenosine损伤引起DNA跨链 (ICL),从而揭示新的基因毒性机制.
科学领域:
- 分子生物学
- 遗传学
- 环境健康
背景情况:
- 基因链交叉连接 (ICL) 是有害的DNA损伤,可能导致像Fanconi贫血这样的遗传疾病.
- 氧化应激和多环芳氨酸被怀疑是ICL的原因,但具体的机制和作用者仍然不清楚.
研究的目的:
- 调查由阿里拉米诺致癌物形成的8-arylamino-2-deoxyadenosine (ArNHdA) 损伤是否可以在氧化条件下产生ICL.
- 阐明由这些病变引起的ICL形成的化学途径和特异性.
主要方法:
- 暴露于反应性氧物种 (ROS),特别是酸二氧化碳酸的8-arylamino-2-deoxyadenosine病变.
- 使用特定的氨酸致癌物 (双,) 和DNA基 (氨酸,氨酸) 的ICL形成分析.
- 提出了一种反应机制,包括将ArNHdA氧化为二米诺亚丁胺中间体.
主要成果:
- 在氧化条件下,8-arylamino-2-deoxyadenosine病变作为潜伏的交叉链接剂,形成ICL.
- 从8-阿米诺亚丁胺观察到ICL形成,但不是8-阿米诺氨酸,这表明基因特异性.
- 该研究发现了涉及ROS和氨酸致癌物的新型交联化学物质.
结论:
- 8 - 氨基-2 - 脱氧氨酸介导的ICL是一种新型的ROS诱导和多环芳氨酸诱导的ICL.
- 这些发现揭示了氨酸致癌物的基因毒性作用,并突出了C8修饰型腺素在氧化应激诱导的ICL中的作用.
相关概念视频
Spontaneous and Induced Mutations
311
Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
311
Mutagenicity and Carcinogenicity
1.5K
Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
1.5K
Mutations
41.3K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
41.3K
DNA Damage can Stall the Cell Cycle
9.5K
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...
9.5K
Nucleotide Excision Repair
4.0K
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...
4.0K
Overview of DNA Repair
32.2K
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...
32.2K


