转录因子Sp1对于早期胚胎发育至关重要,但对于细胞生长和分化是不可或缺的
1Erasmus University Rotterdam, Department of Cell Biology, The Netherlands.
Cell
|May 16, 1997
概括
转录因子Sp1对于胚胎发育和细胞维护至关重要. 它的缺失导致发育异常和甲基-CpG结合蛋白2 (MeCP2) 的表达减少,影响细胞分化.
科学领域:
- 发展生物学 发展生物学
- 基因规则 基因规则
- 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Sp1 (Sp1) 参与基因表达,细胞周期和染色质结构.
- 已经提出了Sp1在维持无甲基化CpG岛屿和活性染色质中的作用.
- 甲基-CpG结合蛋白2 (MeCP2) 对于维持分化的细胞至关重要.
研究的目的:
- 调查转录因子Sp1.1的体内功能.
- 确定Sp1基因失活对胚胎发育和基因表达的影响.
- 阐明细胞过程中Sp1和MeCP2之间的关系.
主要方法:
- 基因向制造Sp1-缺乏 (Sp1-/-) 的小鼠.
- 胚胎发育和生存能力的分析.
- 在Sp1-/-胚胎中对假定Sp1目标基因和MeCP2的基因表达分析.
主要成果:
- Sp1-/-胚胎在11日左右表现出发育迟缓,多种异常和胚胎死亡率.
- 尽管存在Sp1缺陷,但许多向基因,包括细胞周期基因,不受影响.
- CpG 群岛保持无甲基化, Sp1-/- 胚胎中的活体染色体在球蛋白位点形成.
- 重要的是,MeCP2的表达在Sp1-/-胚胎中显著降低.
结论:
- Sp1对于正常的胚胎发育和生存至关重要.
- 在调节MeCP2表达方面Sp1的作用对于维持分化的细胞至关重要.
- 在涉及MeCP2和潜在的细胞分化维护过程中,Sp1起到关键调节者的作用.
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