RUNX1 C端突变通过扰乱特定的增强剂-促进剂网络,损害血细胞分化
Nathan D Jayne1,2, Zhengyu Liang3, Do-Hwan Lim3
1Moores UCSD Cancer Center, University of California San Diego, La Jolla, CA.
Blood advances
|March 21, 2024
概括
在其DNA结合域之外的RUNX1突变可以产生破坏血细胞发育的蛋白质. 这些RUNX1突变通过新的机制失调血液形成,与简单的基因沉默不同.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 癌症遗传学 癌症遗传学
背景情况:
- RUNX1对于血细胞形成至关重要,在髓状癌症中经常发生突变.
- 在DNA结合的Runt同质域 (RHD) 中的突变会损害RUNX1的功能.
- 在RHD之外的RUNX1突变在疾病发病过程中的作用尚不清楚.
研究的目的:
- 为了研究位于RHD之外的RUNX1突变的功能后果.
- 阐明这些突变导致造血性疾病的独特机制.
主要方法:
- 分析患者数据以确定常见的RUNX1突变部位.
- 产生具有特定C端RUNX1突变 (RUNX1R320*) 的小鼠模型.
- 全球RNA与DNA的相互作用通过深度测序 (GRID-seq) 来绘制增强剂-促进剂相互作用.
主要成果:
- 在C端的RUNX1突变在造血性疾病中普遍存在,并且经常产生截断的蛋白质.
- RUNX1R320*突变通过独特的转录特征损害了巨核细胞分化.
- GRID-seq揭示了增强剂-促进剂网络的广泛变化,并确定了MYC超级增强剂的RUNX1R320*和FOXK2结合,导致MYC上调.
结论:
- 在RHD之外的RUNX1突变经常表达,并通过与RUNX1功能丧失不同的机制导致疾病.
- 这些突变的RUNX1蛋白质可以通过改变增强剂-促进剂网络和调高MYC等瘤基因来调节血液形成.
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