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Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...

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相关实验视频

Updated: Jul 12, 2026

Microbead Implantation in the Zebrafish Embryo
05:54

Microbead Implantation in the Zebrafish Embryo

Published on: July 30, 2015

与活性素和节点相关的因素控制斑马鱼胚胎的前后图案.

B Thisse1, C V Wright, C Thisse

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, CU de Strasbourg, France.

Nature
|February 10, 2000
PubMed
概括

斑马鱼在前后轴上的胚胎发育受Activin和节点相关因素的调节. 竞争性抑制剂Antivin调节这些信号以确定细胞命运.

科学领域:

  • 发育生物学 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:

  • 背腹轴的模式依赖于骨形态遗传蛋白 (BMP) 和背组织剂对手 (例如Noggin,Chordin).
  • 腹部化BMPs与背部化抗剂的比率决定了背部腹部轴沿线的细胞命运.

研究的目的:

  • 调查Aktivin和节点相关因素在斑马鱼胚胎前后轴图案中的作用.
  • 在这个过程中探索Antivin作为竞争性抑制剂的功能.

主要方法:

  • 使用一种非遗传干扰方法与Antivin,一个左撇子相关的基因产物.
  • 用不同剂量的Antivin来观察对胚胎发育的影响.
  • 过度表达的活性蛋白或结节相关因素,以评估它们对细胞命运的影响.

主要成果:

  • 增加Antivin剂量逐渐消除后部外皮,只留下前脑和眼睛.
  • 过度表达Activin/节点相关因素将潜在的前脑转化为后部外皮或中皮命运.
  • 显示了Antivin对前后形状的剂量依赖作用.

结论:

  • 活性蛋白和节点相关因素是斑马鱼前后轴模式的关键调节者.

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Last Updated: Jul 12, 2026

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  • 安提文对这些信号通路的调节提供了分级细胞命运建立的机制.
  • 这项研究揭示了增长因子-β超级家族成员在前后模式中转化的一个新角色.