在肺腺癌中,FoxA1/2-依赖的表观基因组重编程驱动了血统切换
bioRxiv : the preprint server for biology
|November 14, 2023
概括
先进的FoxA1/2因子通过改变DNA甲基化和基因调节来将肺癌细胞重新编程为胃的身份,这是一个依赖于瘤性KRAS的过程. 这揭示了在KRAS驱动的肺腺癌中癌细胞谱系切换的机制.
科学领域:
- 癌症生物学 癌症生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子瘤学分子瘤学
背景情况:
- 癌细胞改变身份的能力对于瘤的生存和进展至关重要.
- 在KRAS驱动的肺腺癌 (LUAD) 中,NKX2-1的损失促进了瘤的进展和肺到胃血统的切换.
- 这种由FoxA1和FoxA2驱动的谱系交换机背后的精确机制在很大程度上是未知的.
研究的目的:
- 阐明FoxA1/2将NKX2-1阴性LUAD细胞重新编程为胃身份的表观遗传机制.
- 调查TET3的作用,DNA脱甲基化和调节元素动态在这个血统的可塑性.
- 确定在FoxA1/2-介导的表观遗传重编程中对瘤性KRAS的要求.
主要方法:
- 在LUAD模型中,CRISPR-Cas9介导的Nkx2-1删除.
- TET3招募试验和DNA脱甲基化分析.
- H3K27ac ChIP-seq和HiChIP用于评估调节元件活动和3D相互作用.
- 克拉斯的依赖性研究.
主要成果:
- 通过Nkx2-1删除后的TET3招募,FoxA1/2调解胃定义基因的脱甲基化.
- 控制FoxA1/2调节元件活性和3D染色体相互作用在胃部位置.
- 瘤性KRAS对于FoxA1/2-驱动的表观遗传重编程和血统切换至关重要.
结论:
- 福克斯A1/2重新编程NKX2-1阴性LUAD的表观遗传格局,驱动胃系谱开关.
- 这种重编程涉及DNA去甲基化,改变的组分素标记,以及 cis-regulatory动态的变化.
- 这些发现突出了癌细胞可塑性的新机制,这对于LUAD中的瘤进展至关重要.
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