PRDM1通过在光暗区过渡期间关闭染色质可访问性来塑造生殖中心B细胞的克隆多样性
bioRxiv : the preprint server for biology
|September 15, 2025
概括
蛋白质PRDM1 (BLIMP1) 意外地抑制了生殖中心B细胞的反应. 失去PRDM1会导致B细胞反应过度,并增加克隆主导,影响免疫多样性.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 生殖中心 (GC) B细胞的反应涉及亲和力成熟,但缺乏已知的克隆主导的调节者.
- 虽然NR4A1是已知的调节者,但抑制B细胞克隆扩张的其他因素不太了解.
研究的目的:
- 研究PRDM1 (BLIMP1),一个血细胞决定因子,在调节生殖中心B细胞反应和亲和力成熟中的作用.
- 阐明PRDM1控制B细胞克隆扩张和目录多样性的分子机制.
主要方法:
- 单细胞RNA测序 (scRNA-seq) 和B细胞受体测序 (BCR-seq) 用于分析B细胞反应.
- 使用单细胞染色体概况与基分辨率建模来评估PRDM1对基因调节和染色体可访问性的影响.
主要成果:
- B细胞特异性PRDM1的丧失导致了过度的GC反应,其特征是更大的克隆,增加的体质突变,以及独立于NR4A1.1.的更高的克隆主导地位.
- 发现PRDM1抑制BCR信号基因并调节转录因子关键结合基因 (ISRE,EICE,NF-κB,POU) 的染色质可访问性.
- PRDM1 缺陷导致信号驱动的转录因子增强,在光区选择过程中促进G1-S过渡,并推动暗区扩张.
结论:
- PRDM1作为一个关键的反调节器,减弱BCR信号,并限制GC B细胞的光区到暗区的过渡.
- 通过染色体编码的检查点,PRDM1微调了克隆竞争,通过染色体编码的检查点保持了B细胞谱的多样性.
- 这种监管机制为调节疫苗反应提供了潜力.
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