在表观遗传序列背景下,由2-酸产生的庞大的阿里胺-dG附的形状依赖性损伤绕道
Alicia M Crisalli1, Yi-Tzai Chen1, Ang Cai1
1Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI 02881, USA.
Nucleic acids research
|November 12, 2023
概括
像5-甲基细胞素 (5mC) 这样的表观遗传变化会影响细胞如何绕过庞大的DNA损伤,影响病变修复和潜在的癌症风险. 这项研究揭示了5mC对DNA adduct bypass的序列特异性影响.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- DNA损伤和修复的过程
背景情况:
- 众所周知,序列上下文会影响DNA adduct 结构和修复.
- 表观遗传修饰,如5-甲基细胞因子 (5mC),可以改变DNA构造,但它们对DNA损伤绕行路径的影响尚不清楚.
- 像2 - 酸的样子一样,大量的DNA添加物存在于不同的构造 (B和S) 中,并被研究为化学致癌模型.
研究的目的:
- 调查表观遗传调制,特别是5mC如何影响DNA损伤的结构异质性和绕过效率.
- 在5mC的存在下,阐明依赖序列的绕道变化的构造基础.
主要方法:
- 在各种表观遗传序列背景下研究了N-(2'-deoxyguanosin-8-yl)-7-fluoro-2-aminofluorene (dG-FAF) 损伤.
- 使用DNA序列,在特定位置使用氨酸 (C) 或5-甲基氨酸 (5mC),以及氨酸 (G) 或G-FAF损伤.
- 分析了DNA附加形态 (B和S形态) 和绕道效率之间的关系.
主要成果:
- 对dG-FAF病变的绕道依赖于形状,并受到侧面序列和5mC的影响.
- 当5'基是5mC时,使用3'金字素的序列显示了增强的旁路.
- 使用3'纯氨酸的序列显示出相反的效果,旁路可能与非S/B形状有关.
结论:
- 5-甲基细胞氨酸 (5mC) 在调节大量DNA损伤的绕过效率方面发挥着重要作用,以特定序列的方式.
- 由5mC引起的形状变化,包括非正规结构的潜在出现,是DNA损伤绕行变化的基础.
- 这项研究为表观遗传学,DNA构造和DNA修复机制之间的相互作用提供了新的见解.
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