由8-oxo-7,8-dihydroguanine诱导的远程作用突变取决于APOBEC3的作用
Ruriko Fukushima1, Tetsuya Suzuki1, Akari Kobayakawa1
1Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
Mutagenesis
|July 20, 2023
概括
氧化性DNA损伤,特别是8-oxoguanine (GO),导致突变. 这项研究发现,APOBEC3B显著减少了远离损伤部位发生的GO诱导突变.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- DNA氧化对基因组稳定性构成重大风险,导致突变和癌症.
- 8-oxo-7,8-dihydroguanine (GO) 是一种主要的氧化DNA损伤,诱导直接的G:C→T:A转变和远程突变.
- 由GO诱导的远程作用突变发生在5'-GpA-3'位点,这些位点是APOBEC3酶的目标.
研究的目的:
- 研究APOBEC3B在人类细胞中介于GO诱导的远程作用突变中的作用.
主要方法:
- 在人类U2OS细胞中,APOBEC3B的破坏.
- 将GO-shuttle等离子体转移到这些细胞中.
- 分析突变频率,特别是远程作用突变.
主要成果:
- 击败APOBEC3B显著减少了大约75%的GO诱导的远程作用突变.
- 这表明这些遥远的突变对APOBEC3B活动有很强的依赖.
结论:
- APOBEC3B在8-oxoguanine诱导的远程作用突变的突变发生机制中发挥着关键作用.
- 准APOBEC3B可能是减轻由氧化DNA损伤引起的基因组不稳定性的策略.
相关概念视频
Spontaneous and Induced Mutations
41
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).
41
Base Excision Repair
22.6K
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...
22.6K
Nucleotide Excision Repair
37.3K
Overview
37.3K
Mismatch Repair
4.9K
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...
4.9K
Base-pairing and DNA Repair
64.8K
64.8K
Overview of DNA Repair
31.1K
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...
31.1K


