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相关概念视频

Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

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Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
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在早期心脏发育过程中,PDGFRA是一种保存的HAND2效应器.

Yanli Xu1, Rupal Gehlot1, Samuel J Capon1

  • 1Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.

Nature cardiovascular research
|December 10, 2024
PubMed
概括

转录因子HAND2对于心脏发育至关重要. 在心脏发生过程中,DNA结合,而不是二元化,对于HAND2功能至关重要,PDGFR-alpha被确定为一个关键的下游效应因子.

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科学领域:

  • 发展生物学 发展生物学
  • 遗传学 遗传学 是一个
  • 分子生物学分子生物学

背景情况:

  • 转录因子HAND2在脊椎动物的器官生成中起着至关重要的作用,特别是在心脏发育中.
  • 在心脏发生过程中 HAND2 的功能背后的精确分子机制尚未完全阐明.

研究的目的:

  • 为了研究心脏发生所需的HAND2的功能域.
  • 在胚胎心肌细胞中识别HAND2的关键下游标.
  • 阐明PDGFR-alpha在HAND2中介心脏发育中的作用.

主要方法:

  • 在斑马鱼中生成和分析各种hand2突变等位基因.
  • 胚胎心肌细胞的转录组分析与改变的HAND2表达.
  • 在斑马鱼手2突变体中的候选基因的体内功能测试.
  • 在不同的HAND2条件下分析小鼠胚胎干细胞衍生的心脏细胞中PDGFR-alpha表达的分析.

主要成果:

  • 缺乏二分化的HAND2突变体表现出零表型,而缺乏DNA结合的突变体则没有.
  • 确定了PDGFR-alpha作为一个关键的效应基因,有效地挽救了hand2突变者的心肌迁移缺陷.
  • 在斑马鱼的pdgfra locus中确定了一个功能性的Hand2绑定区域,影响其表达.
  • 在斑马鱼和小鼠心脏发育模型中,HAND2调节PDGFR-alpha表达.

结论:

  • HAND2的DNA结合活性对于其在心脏生成中的功能至关重要,而二元化是不可缺少的.
  • PDGFR-alpha是HAND2的关键下游标,在心脏发育过程中调解心肌迁移.
  • 这项研究为控制HAND2在脊椎动物早期心脏形成中的作用的分子机制提供了重要的见解.