在Schizosaccharomyces pombe中,Claspin对于保持异性染色素至关重要
Kei Kawakami1,2,3, Yukari Ueno1, Nao Hayama1
1Department of Bioscience, School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo, Japan.
Genes to cells : devoted to molecular & cellular mechanisms
|October 30, 2024
概括
这项研究揭示了在裂变酵母中细胞分裂过程中,异性染色素是如何维持的. 研究人员确定Mrc1对异性染色质稳定性至关重要,影响基因沉默和细胞身份.
科学领域:
- 表观遗传学和基因调控
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在真核细胞的增殖过程中,色素结构对于抑制基因表达和维持细胞身份至关重要.
- 通过细胞分裂控制异染色质维护和遗传的机制尚未完全理解.
研究的目的:
- 为了研究分裂酵母,Schizosaccharomyces pombe.的亚端粒区域中的异性染色素的维持.
- 使用全基因组屏幕识别涉及异色素维护的新型因素.
主要方法:
- 开发一个报告员系统,用于研究S. pombe.中亚端粒异色素维护的研究.
- 基因删除库的全基因组屏幕,以识别异染色质维护因子.
- 专注于Mrc1 (Claspin) 来阐明它在异色素蛋白结构和调节中的作用.
主要成果:
- 一旦建立,subtelomeric heterochromatin通过细胞增殖保持为一个转移稳定的结构.
- 鉴定了57个基因,包括Mrc1,参与了异性染色体的维护.
- 发现Mrc1可以在子端粒,周心端粒和交配类型区域中保持异色色素.
- Mrc1对于Snf2/Hdac含有抑制器复合体 (SHREC) 和素H3K14低乙化的局部化至关重要.
结论:
- 在S. pombe的多个基因组区域中,Mrc1在维持异染色素结构方面发挥着重要作用.
- 作为基因素陪伴者的Mrc1的功能对于异色染色体稳定性和基因沉默至关重要.
- 这项研究加深了对表观遗传和细胞身份维护的理解.
相关概念视频
02:19The Spindle Assembly Checkpoint
3.1K
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
3.1K
02:17Separation of Sister Chromatids
3.6K
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...
3.6K
02:20Cohesins
4.4K
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...
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...
4.4K
00:50Anaphase Promoting Complex
2.8K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
2.8K
02:30Histone Variants at the Centromere
4.3K
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
4.3K
03:17Inheritance of Chromatin Structures
6.2K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.2K