表观基因组和转录基因组衰老的可塑性揭示了通过环境暴露重新编程的共同目标
Cheryl Walker1, Sandra Grimm1, Rahul Jangid1
1Baylor College of Medicine.
Research square
|September 26, 2025
概括
早期接触有毒物质会重编程表观基因组,改变肝脏衰老的基因表达,并导致肝脏疾病的发生. 这种重新编程会产生持久的细胞变化,反映人类肝脏疾病和癌症.
科学领域:
- 环境健康 环境健康
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 毒理学 毒理学 毒理学
背景情况:
- 早期的环境暴露是成人健康和疾病的关键决定因素.
- 这些暴露对整个生命周期的疾病风险的长期影响尚不清楚.
研究的目的:
- 为了研究早期的毒素暴露如何持续地重编程表观基因组,并影响与年龄相关的基因表达轨迹.
- 为了确定这些重编程状态是否会导致肝脏疾病.
主要方法:
- 塔吉特II联盟从怀孕前到断奶期间,将小鼠暴露在各种有毒物质 (BPA,TBT,TCDD,PM2.5) 中.
- 进行了多基因组 (表观基因组和转录基因组) 分析,对来自老鼠的800多个肝脏样本进行了跟踪,直到成年.
- 分析的重点是确定与肝脏衰老相关的有毒剂诱导的表观遗传和转录变化的趋同.
主要成果:
- 多种有毒物质聚集在与肝脏衰老相关的基因上,无论化学类或机制如何.
- 增强剂中的质子修饰是关键目标,重编程肝脏衰老相关可塑性基因 (LAAsP).
- 重编程导致了双向变化:肝细胞中抑制的代谢基因和非基细胞中升高的细胞外基因基因.
结论:
- 早期的环境暴露可以劫持表观基因老化可塑性,导致基因表达的持久重编程.
- 这些两极分化的转录状态预示着慢性肝病和癌症.
- 鉴定到的LAAsP基因特征和极化状态有效地区分了健康的人与患病的人肝转录组.
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