人类卵子中杆组织和不稳定的机制
Chun So1, Katerina Menelaou1,2, Julia Uraji1,2
1Department of Meiosis, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany.
Science (New York, N.Y.)
|February 10, 2022
概括
人类卵细胞通常具有不稳定的介质,导致无体积. 研究人员发现KIFC1 (激素超级蛋白C1) 电机的缺陷导致了这种不稳定性,影响了人类卵子的质量.
科学领域:
- 细胞生物学
- 生殖生物学
- 遗传学
背景情况:
- 人类卵子经常表现出介质不稳定性,这种情况与卵子的无体积有关.
- 这种轴心不稳定的确切原因在很大程度上仍未确定.
- 微管组织中心 (MTOC) 在线索形成和稳定性中起着至关重要的作用.
研究的目的:
- 研究人类卵细胞中介质不稳定的分子机制.
- 确定负责稳定的蛋白质,并探索它们在人类卵细胞中的缺陷.
- 确定KIFC1 (基因素超级蛋白C1) 缺乏是否会导致人类卵细胞的不稳定性.
主要方法:
- 人类,牛和猪卵细胞中螺旋杆组织的比较分析.
- 研究了NUMA (核线性器官蛋白) 在微管子减尾聚类中的作用.
- 在卵细胞中利用KIFC1耗尽和再引入实验来评估稳定性.
主要成果:
- 通过NUMA调节的聚类聚焦了跨物种的杆,但只有人类卵细胞显示不稳定性.
- 在人类卵细胞中发现了KIFC1 (kinesin超级蛋白C1) 运动蛋白的缺乏.
- 在牛和小鼠卵细胞中,KIFC1的耗尽导致了不稳定性;KIFC1的增加拯救了人类卵细胞的不稳定性.
结论:
- 基因素超级蛋白C1 (KIFC1) 是卵细胞中关键的螺旋稳定蛋白.
- 缺少KIFC1是人类卵细胞中介质不稳定的关键因素.
- 恢复KIFC1水平提供了一种改善人类卵子质量的潜在策略,并减少质.
相关概念视频
02:57Meiosis vs. Mitosis
59.6K
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
59.6K
02:02Meiosis II
47.1K
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
47.1K
02:27The Mitotic Spindle
6.9K
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...
6.9K
02:07Oogenesis
64.7K
In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
64.7K
02:50Spindle Assembly
3.8K
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...
3.8K
02:17Microtubule Instability
5.3K
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...
5.3K