该ncBAF复合体通过BRD9的H3K27ac感应来调节AML中的转录
David C Klein1, Santana M Lardo1, Sarah J Hainer1,2
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania.
Cancer research communications
|December 21, 2023
概括
odomain抑制BRD9 (odomain含蛋白9) 对于急性髓性白血病 (AML) 细胞存活至关重要. 这项研究揭示了BRD9通过控制AML中的染色质可访问性和基因转录来调节骨髓分化.
科学领域:
- 在瘤学瘤学.
- 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.
背景情况:
- 非正规的BAF (ncBAF) 复杂子单元BRD9对于急性髓性白血病 (AML) 细胞存活至关重要.
- 它作为转录调节器与白血病发生中的支架蛋白的精确作用尚未完全理解.
研究的目的:
- 调查BRD9原蛋白活性在调节AML细胞活力和白血病发生中的作用.
- 阐明BRD9维持AML细胞存活的分子机制.
主要方法:
- 选择了五个AML细胞系,具有不同的遗传特征,用于短期的BRD9odomain抑制.
- 评估了基因依赖的细胞生长,新生的转录,染色质可访问性和全基因组的ncBAF复杂结合.
主要成果:
- 确定了对BRD9原蛋白活性对AML细胞系存活的依赖性,但不是在HEK293T细胞中.
- 通过BRD9表现出广泛的转录调节,包括抑制髓状细胞成熟因子和瘤抑制基因.
- 显示BRD9维持了促进剂和增强剂的染色质可访问性,与BRD9结合相关.
- 在BRD9抑制后观察到在特定的转录因子基因 (GATA,ETS,AP-1,SNAIL,HIC,TP53) 上变化的染色质可访问性.
结论:
- BRD9原蛋白活性对AML细胞存活至关重要,并且在调节AML细胞分化方面发挥着重要作用.
- BRD9调节了在造血细胞转录因子结合部位的染色质可访问性,影响了对髓状细胞发育至关重要的基因表达.
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