通过ISWI强制核细胞分相控制骨髓系忠实性和对刺激的反应
Sara Polletti1, Júlia Melià-Alomà1, Francesco Pileri1
1Department of Experimental Oncology, European Institute of Oncology, IEO IRCCS, Milan, Italy.
Immunity
|September 26, 2025
概括
一种ISWI染色体重塑剂SMARCA5,通过控制DNA可访问性来维持巨细胞的身份. 它的损失允许不适当的基因激活,影响细胞功能和潜在的其他免疫细胞.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 免疫学 免疫学 免疫学
- 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:
- 染色体重塑剂和先驱转录因子 (TFs) 对细胞身份至关重要.
- 模仿开关 (ISWI) 染色质重塑剂调节核细胞间距.
- 在髓状细胞中,SMARCA5是唯一的ISWI ATPase.
研究的目的:
- 研究SMARCA5在巨细胞分化和激活中的作用.
- 确定SMARCA5如何影响染色质可访问性和TF结合.
- 了解SMARCA5损失对巨细胞转录忠实性的影响.
主要方法:
- 在骨髓衍生的巨细胞中有条件的Smarca5删除.
- 核细胞分相和TF占用率的分析.
- 评估 cis 监管要素的可访问性.
- 对基因表达模式的评估.
主要成果:
- 在PU.1结合部位附近,Smarca5删除破坏了核细胞相位.
- 失去了SMARCA5增加了C/EBPβ的可访问性,这是一个弱的先驱TF.
- 这导致了谱系不适当的转录和巨细胞过度激活.
- 在刺激诱导的TF结合部位上,可访问性增加,导致错误表达.
结论:
- 基于SMARCA5的核细胞分相抑制了不适当的TF结合.
- 这确保了巨细胞发育和激活期间的转录忠实性.
- 在其他免疫细胞类型中,SMARCA5可能也扮演着类似的角色.
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