核β-catenin的时空需求定义了早期海的胚胎发生
Guy Lhomond1, Michael Schubert1, Jenifer Croce1
1Sorbonne Université, CNRS, Institut de la Mer de Villefranche (IMEV), Laboratoire de Biologie du Développement de Villefranche-sur-Mer (LBDV), Evolution of Intercellular Signaling in Development (EvoInSiDe), Villefranche-sur-Mer, France.
PLoS biology
|November 12, 2024
概括
这项研究揭示了β-catenin活性对于在海胚胎中建立生殖层至关重要. 不同的胚胎层需要不同的β-catenin持续时间来形成和维持,影响胚胎模式.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 胚胎发生是胚胎发生.
背景情况:
- 生殖层的建立对于有模式的胚胎形成至关重要.
- β-catenin是动物早期发育中的关键蛋白质,但其全部作用尚不清楚.
- 以前的研究主要使用受精阶段的抑制,限制了全面的分析.
研究的目的:
- 为了全面定义核β-catenin在海胚胎发生过程中的时空需求.
- 研究β-catenin在不同发育阶段的生殖层建立和模式形成中的作用.
- 阐明不同生殖层规范和维护所需的β-catenin活性的特定持续时间.
主要方法:
- 在海 (Paracentrotus lividus) 中使用一种可诱导的,有条件的淘汰系统.
- 阻断了从受精到受精后12小时的7个不同的时间点的β-catenin蛋白质生产.
- 分析了对胚胎层形成的影响,沿着动物植物轴的模式,以及胚胎层身份的维护.
主要成果:
- 建立了胚胎层位置与核β-catenin活动的依赖之间的相关性.
- 对于骨性中皮层,非骨性中皮层和内皮层的规格,已经证明了不同的,特定于时间的β-catenin要求.
- 显示了外皮和前部神经外皮限制的差异性β-catenin持续时间,前部神经外皮需要最长的时间.
- 识别了非骨架性半皮体和内皮体身份维护所需的长时间β-catenin活性.
- 发现前部神经皮质受限取决于多个β-catenin输入和一个独立的机制.
结论:
- 这项研究提供了海胚胎发生过程中β-catenin需求的第一个全面的时空地图.
- 结果显示,精确的时间控制β-catenin活动对于生殖层的规范和模式是必不可少的.
- 突出了β-catenin在动物发育中的进化保存的,但仍是特定于阶段和生殖层的角色.
相关概念视频
Catenins
2.3K
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
2.3K
Gastrulation
56.7K
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
56.7K
Non-Canonical Wnt Signaling Pathways
7.2K
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
7.2K
Determination
18.2K
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...
18.2K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.1K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.1K
Canonical Wnt Signaling Pathway
8.7K
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
8.7K


