HIM-8与X染色体配对中心结合,并调解染色体特异的介质突触
Carolyn M Phillips1, Chihunt Wong, Needhi Bhalla
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Cell
|December 20, 2005
概括
在C. elegans中,him-8基因对于X染色体在半变化过程中的配对至关重要. 失去了他-8功能破坏了这个过程,突出了它在同类染色体稳定中的重要作用.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 发育生物学 发展生物学
背景情况:
- 弥生症需要精确的染色体分离来实现遗传多样性.
- 众所周知,C. elegans中的him-8基因对X染色体分离至关重要.
- 适当的同源染色体配对和突触对于成功的半变异至关重要.
研究的目的:
- 为了研究 him-8 基因在 C. elegans 化中的功能.
- 阐明HIM-8促进X染色体配对和突触的分子机制.
- 确定核外协会在HIM-8介导的染色体稳定中的作用.
主要方法:
- 在C. elegans中对他-8功能丧失突变的分析.
- 介质预相期间的HIM-8蛋白位址的特征.
- 基因相互作用研究他-8突变和介质配对中心 (PC) 病变.
- 评估染色体配对,突触和核膜协会.
主要成果:
- 失去他-8功能导致X染色体同类配对和突触的严重缺陷.
- HIM-8是一种C2H2指蛋白,定位在X染色体上的中间配对中心 (PC).
- 在介质前期,HIM-8结合的染色体位与核外 (NE) 相结合.
- 一个保留染色体结合和NE局部化的him-8突变未能稳定配对或促进突触.
结论:
- 在C. elegans中,HIM-8对于X染色体同类配对和突触至关重要.
- 虽然NE结合可能是必要的,但它不足以稳定同类染色体配对.
- 介质配对稳定是一个活跃的过程,不仅涉及通过HIM-8调解的染色体-NE相互作用.
相关概念视频
01:49Meiosis I
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
01:57Meiosis II
Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
03:09Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
02:02Meiosis II
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,...
03:09Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
02:02Meiosis II
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,...