鼠标Ets1基因内部和上游的序列驱动B细胞的高水平表达,但不足以在T细胞中产生一致的表达
Alyssa Kearly1, Prontip Saelee1, Jonathan Bard1
1Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14203.
bioRxiv : the preprint server for biology
|August 16, 2024
概括
转录因子Ets1对于免疫平衡至关重要. 这项研究确定了控制B细胞中Ets1基因表达的调节网络,揭示了其在预防自身免疫性疾病方面的重要性.
科学领域:
- 免疫学 免疫学 免疫学
- 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:
- 转录因子Ets1在静止免疫细胞中高度表达,但在激活时会降低,在预防过度免疫反应和自身免疫性疾病方面发挥关键作用.
- 减少的Ets1表达与人类的自身免疫性疾病有关,这突出了了解其精确基因调节的必要性,以维持免疫平衡.
研究的目的:
- 识别和描述控制Ets1基因表达的遗传调控元素,特别是在B细胞中.
- 阐明在免疫细胞激活过程中Ets1下调的基因表观机制.
主要方法:
- 染色体分析以确定Ets1位点周围的拓关联域 (TAD) 和相互作用中心.
- 表观遗传数据集成 (DNA可访问性,基因组标记) 以精确确定假定的监管元素.
- 记者在转基因小鼠中进行构造试验,以评估调节元件的功能.
- ATAC-seq在静止和刺激的B细胞上,以映射染色质可访问性的动态变化.
- 露西法酶试验评估了监管元素的功能冗余性.
主要成果:
- 在B细胞中发现了一个大型的相互作用枢纽 (超过100kb),包括小鼠Ets1基因位点.
- 证实了该中心内的几种功能调节元件在淋巴细胞组织中驱动记者基因表达,并观察到B细胞特异性活性.
- ATAC-seq揭示了四个具有改变色素可访问性的区域,与B细胞受体刺激后的Ets1基因表达变化相关.
- 功能分析表明,在确定的Ets1监管元素中,存在显著的冗余.
结论:
- 一个复杂的调节网络控制B细胞特异性的Ets1表达已经被发现.
- 这些发现提供了对控制Ets1水平的表观遗传机制的见解,以及它们对免疫平衡和自身免疫性疾病预防的影响.
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