N2-Alkyl-dG病变引起了基因组中的R循环积累
Yinan Wang1, Feng Tang1, Ting Zhao2
1Department of Chemistry, University of California, Riverside, CA 92521-0403, USA.
Nucleic acids research
|October 1, 2024
概括
通过增加R循环积累,DNA化剂会导致基因组不稳定. 未修复的N2-alkyl-dG病变会破坏转录并损害基因组完整性,这表明R环酶抑制剂作为治疗策略.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 生物化学 生物化学
背景情况:
- 来自新陈代谢,环境或化疗的DNA化剂可以导致基因组不稳定.
- R-循环 (RNA-DNA杂交) 对细胞过程至关重要,但当异常时也可能导致DNA损伤.
- 小沟N2-alkyl-dG病变是一种由化剂诱导的DNA损伤.
研究的目的:
- 为了研究小沟N2-基-dG病变和R循环积累之间的关系.
- 确定N2-基-dG诱导的R循环对细胞过程和基因组完整性的影响.
- 探索R环酶在细胞对DNA损伤敏感性的作用.
主要方法:
- 光显微镜可用于可视化DNA和R循环结构.
- 进行R循环测序 (RLS) 以在全基因组范围内映射R循环形成.
- 基因操纵,包括对R环酶DDX23.23的基因耗尽.
- 使用特定致癌物质进行细胞敏感性测试.
主要成果:
- 发现小沟N2-alkyl-dG病变在染色质和等离子体DNA中显著增加R环积累.
- 这些N2-基-dG诱导的R环被证明可以抑制转录延长并损害基因组完整性.
- 减少R环环化酶DDX23的作用增加了细胞对[a]二氧化,一种致癌物质诱导N2-dG附加物的敏感性.
结论:
- 未修复的小沟N2-alkyl-dG病变通过提高R循环水平,导致基因组不稳定.
- 这些发现突出了一个新的机制,DNA化会影响基因组完整性.
- 将R环酶抑制剂与DNA化药物结合起来,可能为癌症治疗提供一种新的治疗方法.
相关概念视频
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
36.9K
Overview
36.9K
Translesion DNA Polymerases
9.9K
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...
9.9K
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
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


