微管在线粒细胞分裂期间的微管重组在dinoflagellate Ostreospis中,参见. 卵子 卵子 卵子
David Velasquez-Carvajal1, Flavie Garampon1, Lydia Besnardeau1
1Sorbonne Universités, CNRS, Laboratoire de Biologie du Développement de Villefranche-sur-Mer (LBDV), 06230 Villefranche-sur-Mer, France.
Journal of cell science
|May 21, 2024
概括
海藻Dinoflagellates在开花期间经历细胞分裂. 这项研究揭示了在Ostreopsis cf. 中的线粒分裂和细胞运动期间独特的微管子动态. 卵子,不同于其他真核生物.
科学领域:
- 海洋生物学 海洋生物学
- 细胞生物学 细胞生物学
- 微生物学 微生物学
背景情况:
- 丁诺鞭状体是关键的海洋浮游植物,负责藻类繁殖.
- 了解它们的细胞增殖,特别是细胞分裂和细胞运动,是必不可少的,但仍然有限.
- 这种有毒的恐龙鞭状虫Ostreopsis cf. 卵子作为一个模型生物体.
研究的目的:
- 为了研究在Ostreopsis的线粒循环期间微管组织的动态变化,参见Ostreopsis. 卵子. 卵子.
- 为了阐明这种恐龙状体物种中神经分裂和细胞运动的机制.
主要方法:
- 优化了用于可视化微管的免疫光协议.
- 分析线粒体组织和线粒体在线粒体分裂期间的翻译后修饰的分析.
- 用显微镜观察Ostreopsis cf. 的情况. 卵子细胞分裂. 卵子细胞分裂.
主要成果:
- 旗和皮层微管在整个线粒循环中持续存在.
- 显著的细胞质微管束起源于基底体,与核和关联.
- 在染色体分离过程中,两个状微管群 (乙化和铁化) 呈现差异延长.
- 一个新的微管丰富的结构促进了细胞动力学,独立于actomyosin环.
结论:
- 丁诺鞭状细胞分裂包括一个持久的核外螺旋和独特的微管动力学.
- 在Ostreopsis中细胞动力学 cf. 卵子使用一种不涉及actomyosin环的独特机制.
- 这项研究为生态意义重大海洋恐龙鞭虫的细胞分裂过程提供了新的见解.
相关概念视频
02:17Microtubule Instability
5.1K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.1K
01:13Centrioles and Centrosomes
2.7K
Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
Near the end of the prophase, also called late prophase or...
2.7K
01:35Mitosis and Cytokinesis
6.1K
In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
6.1K
02:50Spindle Assembly
3.6K
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
3.6K
01:45Destabilization of Microtubules
2.7K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
2.7K
02:27The Mitotic Spindle
6.6K
The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
6.6K