在胃化过程中TET蛋白的内在和外在作用
Saifeng Cheng1, Markus Mittnenzweig2, Yoav Mayshar1
1Department of Molecular Cell Biology, Weizmann Institute of Science, 7610001 Rehovot, Israel.
Cell
|July 31, 2022
概括
十一转位 (TET) 基因损失导致胚胎死亡. 缺乏TET的细胞可以在野生类型胚胎中分化,但只有突变胚胎不能在早期发育,从而显示出细胞自主性的TET功能.
科学领域:
- 发育生物学
- 表观遗传学
- 遗传学
背景情况:
- 十一转位 (TET) 蛋白质是关键的表观遗传调节剂.
- 在小鼠中,所有TET基因的丧失导致早期胃流死亡,使其特定功能的研究复杂化.
- 解开细胞自主与环境影响的胚胎死亡率至关重要.
研究的目的:
- 隔离和定义TET蛋白在小鼠早期胚胎发育中的细胞自主作用.
- 研究TET损失引起的发育缺陷的分子机制.
- 建立一个在胚胎发生过程中评估内在基因功能的方法.
主要方法:
- 使用部分或完全TET基因缺陷的小鼠胚胎的时间单细胞图谱.
- 在野生类型与完全突变的胚胎环境中分析了TET突变细胞的分化潜力.
- 绘制基因表达变化,包括早期表皮细胞因子和中皮信号通路.
主要成果:
- 当被野生类型细胞包围时,突变细胞保留了分化潜力.
- 仅由TET缺乏细胞组成的胚胎在表皮细胞到外皮细胞的过渡和中皮细胞的发育中出现了缺陷.
- 鉴定了Dppa4和Gdf3的抑制,以及左侧,FGF和Notch信号受损是TET损失的关键后果.
- 假设增强剂去甲基化作为核心机制的损失.
结论:
- TET蛋白对于细胞内在的发育进展至关重要,特别是在中皮形成和信号传递方面.
- 这项研究提供了一种使用时间差异化图谱来剖析发育中的基因功能的新方法.
- 这项研究区分了TET脱甲基化机制的细胞内作用与更广泛的组织水平影响.
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