在斑马鱼模型中,Mef2d通过表观遗传调制来调节IgZ和IgM同型的相互排斥表达
Jianfei Ji1, Nan Zhang1, Chongbin Hu1
1College of Life Sciences, Key Laboratory for Cell and Gene Engineering of Zhejiang Province, Zhejiang University, Hangzhou 310058, China.
肌细胞增强因子2D (Mef2d) 调节了teleosts中的免疫球蛋白Z (IgZ) 基因组合. Mef2d在表观遗传上沉默免疫球蛋白M (IgM) 位点,通过一种新的机制确保独家IgZ的产生.
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:
- 遥远体具有一种新的免疫球蛋白同型,IgZ (或IgT),与现有的类别一起.
- 独特的IgZ和IgM位点的基因组组织表明了不同的重组过程.
- 控制IgZ和IgM同型生成的分子机制在很大程度上是未知的.
研究的目的:
- 阐明Mef2d在IgZ基因组合中的调节作用.
- 调查控制IgZ和IgM位点重组的表观遗传机制.
- 了解调节B细胞中Mef2d表达的信号通路.
主要方法:
- 利用斑马鱼模型研究IgZ基因组合.
- 研究了Mef2d结合部位和IgM位点上的表观遗传修饰.
- 分析了Mef2d表达及其通过Il-7/Il-7r/p38 MAPK通路的调节.
主要成果:
- 通过与3'Eμ位点结合,Mef2d可以选择性地抑制IgM重组.
- 在Dμ/Jμ区域,Mef2d招募了Sin3/Hdac1,Setdb1/Ezh2和cohesin,以建立压制性的表观遗传标记 (H3K4me0/H3K9me2/H3K27me2).
- 这些修改使得Rag1/2无法进入IgM位点,从而阻止其重新排列.
- 在IgZ+B细胞中,Mef2d的表达通过Il-7/Il-7r介导的p38 MAPK通路受到差异调节.
结论:
- Mef2d作为一个关键的监管者,在远程播放器中专门生产IgZ.
- 一种新的同型排除机制涉及IgM位点的表观遗传沉默,控制IgZ和IgM重组.
- 这种机制代表了脊椎动物免疫球蛋白多样化的独特策略,与类切换重组不同.
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