在心脏发育过程中,BAF60c对于BAF染色体重塑复合物的功能至关重要
Heiko Lickert1, Jun K Takeuchi, Ingo Von Both
1Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada.
Nature
|November 5, 2004
概括
在小鼠胚胎中,Smarcd3 (Baf60c) 对于心脏发育至关重要. 它的正确表达确保了正确的心脏和骨肌肉的形成,防止先天性心脏缺陷.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 组织特异性转录因子对于胚胎发育至关重要.
- 染色体结构会影响发育过程中的基因调节.
- BAF复合体是重塑色素的酶复合体.
研究的目的:
- 研究Smarcd3 (Baf60c) 在胚胎发育中的作用,特别是在心脏和肌肉形成中.
- 了解Baf60c调节特定组织基因表达的机制.
主要方法:
- 通过RNA干扰 (RNAi) 在从胚胎干细胞获得的小鼠胚胎中使Smarcd3沉默.
- 分析心脏形态发生,心脏和骨肌肉的分化.
- 细胞培养实验研究Baf60c与转录因子和Brg1.1的相互作用.
主要成果:
- Smarcd3在早期小鼠胚胎的心脏和体内特异性表达.
- 沉默smarcd3导致心脏形态发生的缺陷,包括心脏前/二次场扩张受损.
- 减少Smarcd3的表达导致异常的肌肉分化和外流通道重塑缺陷,模仿人类先天性心脏缺陷.
- Baf60c促进了心脏转录因子和Brg1之间的相互作用,增强了目标基因的激活.
结论:
- 在将BAF染色体重塑复合物招募到心脏特异增强剂中,smarcd3起着组织特异和剂量依赖的作用.
- 这为确保器官生成期间的转录调节提供了一个新的机制.
- Baf60c对于正常的心脏发育和预防先天性心脏缺陷至关重要.
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