Molecular mechanisms controlling germ-cell migration in zebrafish

控制斑马鱼生殖细胞迁移的分子机制

• 批准号: 5454619
• 负责人: Professor Dr. Erez Raz
• 金额: --
• 依托单位: Institut für Zellbiologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5454619?language=en
• 关键词: Molecular; mechanisms; controlling; germ; cell

In many organisms the promordial germ cells have to migrate from the position where the are specified towards the developing gonad where they generate gametes. In this process the primordial germ cells (PGGs) reach the region where the gonad forms from distant starting positions through somatic tissues that are themselves subjected to processes of patternig and cell movement. The PGCs are therefore an excellent model system for studying the mechanisms that allow cells to navigate through complex cellular environments towards specific points within the developing embryo. In previous studies we have described in detail the migration process of the PGCs in wild-type zebrafish embryos from the earliest stages of their development to the stage when they reach their target, tje somatic part of the gonad. This proposal is aimed at unterstanding the molecular machinery underlying PGC motility and migration in the direction of a source od attractant. To this end, we propose to characterize the dynamics of cytoskeleton architecture from the time of PGC specification to the time when the cells are capable of exhibiting motile behavior and directional migration. Following this analysis attempts to determine the functional significance of different cytoskeleton configurations will be made using expression of dominant negative cytoskeletal proteins forms and by expression and determination of the spatial activity of regulators of cytoskeleton assembly. These tests will provide important clues regarding the mechanisms promoting cell motility and guided migration.

在许多生物体中，原生殖细胞必须从指定位置迁移到产生配子的发育性腺。在这个过程中，原始生殖细胞（PGGs）从遥远的起始位置通过体细胞组织到达性腺形成的区域，体细胞组织本身也经历了模式化和细胞运动的过程。因此，PGCs是一个很好的模型系统，用于研究允许细胞在复杂的细胞环境中导航到发育中的胚胎中的特定点的机制。在之前的研究中，我们详细描述了野生型斑马鱼胚胎中PGCs的迁移过程，从它们发育的最早阶段到它们到达目标性腺体细胞部分的阶段。本研究旨在了解PGC在源引诱物方向上的运动和迁移的分子机制。为此，我们建议表征从PGC规范时间到细胞能够表现出运动行为和定向迁移的时间的细胞骨架结构动力学。在此分析之后，将利用显性阴性细胞骨架蛋白形式的表达以及细胞骨架组装调节因子的空间活性的表达和测定，试图确定不同细胞骨架构型的功能意义。这些测试将为促进细胞运动和引导迁移的机制提供重要线索。