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一个表观遗传记忆在抗癌的CYP1A基因,污染适应的鱼
Samantha Carrothers1, Rafael Trevisan2,3, Nishad Jayasundara2
1Oregon Institute of Occupational Health Sciences, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, 97239, Portland, OR, USA.
Scientific reports
|January 24, 2025
概括
暴露于多环芳 (PAH) 的野生鱼类发展出可逆的表观遗传记忆,保护它们免受PAH诱导的癌症. 这种记忆涉及细胞染色体P450 1A基因的组素修饰.
科学领域:
- 环境毒理学环境毒理学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
背景情况:
- 人类接触多环芳 (PAH) 是日益严重的公共卫生问题,气候变化和野火加剧了这一问题.
- 细胞染色体P450 1A (CYP1A) 在PAH代谢中起着至关重要的作用,但其诱导可以导致PAH介导的毒性和癌症.
- 野生种群的Fundulus heteroclitus已经适应慢性PAH污染,表现出的CYP1A诱导.
研究的目的:
- 描述Fundulus heteroclitus中PAH耐受性背后的表观遗传机制.
- 为了研究表观遗传记忆在跨代保护人免受PAH诱导的癌症中的作用.
- 了解这种表观遗传适应的可逆性和持久性.
主要方法:
- 对CYP1A基因促进体增强剂的表观遗传修饰,特别是基因组转化后修饰的分析.
- 在不同暴露条件下 (受PAH污染与清洁水) 野生类型和耐受PAH的鱼类中基因诱导模式的比较.
- 检查耐受PAH鱼类的F1胚胎,以评估代际表观遗传.
主要成果:
- 与野生鱼类相比,耐受PAH的鱼类表现出较弱的CYP1A诱导反应.
- 在耐受性鱼类中发现了可逆表观遗传记忆,涉及CYP1A位点的双价位域,在CYP1A位点上具有激活和抑制的基因素标记.
- 耐受性胚胎的表观遗传修饰显示了对PAH暴露的改变反应,这表明了保护机制.
- 成人耐受性鱼类表现出持续的CYP1A诱导,表明长时间暴露后基因关闭的潜在缺陷.
结论:
- 杆菌具有表观遗传记忆,可以防止PAH诱导的癌症,特别是在生命早期阶段.
- 这种表观遗传适应是可逆的,可以跨代传承.
- 虽然提供了生命早期的保护,但持续的基因激活可能会导致成年鱼的这种保护机制退化.
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