染色体形态发生:在半分裂过程中依赖于凝聚素的凝聚素去除
Hong-Guo Yu1, Douglas Koshland
1Howard Hughes Medical Institute/Carnegie Institution, Department of Embryology, Baltimore, Maryland 21218, USA.
Cell
|November 5, 2005
概括
在发芽的酵母中,素和Cdc5激酶在化I过程中从染色体中去除凝聚素. 这一过程对于通过溶解重组链路来适当分离同类染色体至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 半转变需要精确协调染色体凝聚力,凝聚和重组,以实现同质染色体分离.
- 染色体结构维护 (SMC) 复合体,包括凝聚素和凝聚素,在这些过程中起着至关重要的作用.
- 凝聚素维持姐妹染色体的凝聚力,而凝聚素则参与染色体凝聚.
研究的目的:
- 为了研究凝聚素和Cdc5 (Polo样类激酶) 在变过程中对凝聚素的去除中的作用,I.
- 阐明凝聚素去除促进同质染色体分离的机制.
- 了解染色体结构部件和介质事件之间的交叉声.
主要方法:
- 在实验中使用芽酵母Saccharomyces cerevisiae进行了实验.
- 该研究的重点是分析Cdc5与染色体的关联及其凝聚性酸化.
- 研究了凝聚素对Cdc5活性和随后的凝聚素去除的影响.
主要成果:
- ಕಂಡ素和Cdc5协作促进从染色体中去除凝聚素在第一阶段之前.
- 凝聚素的去除对于溶解同类染色体之间的重组依赖的联系至关重要.
- 凝增强了Cdc5与染色体的关联以及其对凝的酸化,从而促进了凝的去除.
结论:
- 排毒素和Cdc5-依赖的凝聚素的去除是介质I过程中准确分离同类染色体的关键步骤.
- 这种机制凸显了染色体结构蛋白之间的交叉通话的重要性.
- 这些发现提供了一个分子机制,将染色体形态发生与其他介质事件相结合.
相关概念视频
02:20Cohesins
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
02:15Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
02:17Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
02:20Cohesins
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
02:15Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
02:17Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...