AIRE依靠Z-DNA标记T细胞耐受性的基因目标
Yuan Fang1,2, Kushagra Bansal3, Sara Mostafavi4,5
1Department of Immunology, Harvard Medical School, Boston, MA, USA.
Nature
|March 14, 2024
概括
自免疫调节蛋白 (AIRE) 通过识别Z-DNA和NFE2-MAF动机来准基因,这些动机促进DNA双链断裂和平衡促进体. 这种机制通过引导AIRE来提高T细胞的耐受性.
科学领域:
- 免疫学
- 分子生物学
- 遗传学
背景情况:
- 自免疫调节蛋白 (AIRE) 通过调节骨髓上皮细胞中的基因表达,对中央T细胞耐受性至关重要.
- 与许多转录因子不同,AIRE的向特异性不太清楚,因为它缺乏定义的DNA结合动机.
- 了解AIRE的调控机制是解读T细胞耐受性和自身免疫性疾病的关键.
研究的目的:
- 阐明控制 AIRE 的基因特异性的 cis 调控机制.
- 确定影响AIRE转录活动的DNA动机和基因组特征.
- 提出AIRE如何与基因组相互作用以促进T细胞耐受性的模型.
主要方法:
- 使用卷积神经网络 (CNN) 来预测AIRE的目标基因.
- 分析了F1杂交小鼠的自然遗传变异,以确定调节影响.
- 进行全基因组映射以将DNA动机与双链断裂生成和染色质可访问性联系起来.
主要成果:
- 在CNN和F1混合分析中,Z-DNA和NFE2-MAF动机被确定为AIRE目标选择的关键因素.
- Z-DNA和NFE2L2结合基因与基因促进体中增加的DNA双链断裂 (DSB) 发生相关.
- 具有高DSB生成的促进体更有可能处于"平衡"状态,其特征是可访问的染色体和预组装的转录机制.
- AIRE主要针对具有这些平衡促进者的基因.
结论:
- AIRE的目标特异性是由Z-DNA调解的,它增强了DSB生成和促进剂毒性.
- 这种机制固定了AIRE介导的转录程序,有助于T细胞的耐受性.
- 这些发现为AIRE功能提供了洞察力,并建议在自身免疫疾病中调节T细胞耐受性的潜在策略.
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