在一个archaeon中,DNA分离和细胞分裂的时间和空间协调
Joe Parham1, Valerio Sorichetti2, Alice Cezanne1
1Division of Cell Biology, Medical Research Council Laboratory of Molecular Biology, Cambridge CB2 0QH, United Kingdom.
概括
这项研究揭示了古生物如何协调DNA分离和细胞分裂,而无需真核细胞循环调节器. 一个检查点确保基因组紧缩只有在分裂环组装后才发生,有助于精确的DNA分布.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 细胞分裂需要精确地协调DNA分离和细胞动力学之间的基因组完整性.
- 细胞的细胞分裂依赖于循环素依赖性激酶 (CDK) 和循环素,而这些基因在古生物中是不存在的.
- 了解古老的分裂机制,可以了解细胞循环控制的演变.
研究的目的:
- 为了研究DNA分离和细胞分裂在古生物中的机制性合,特别是在*Sulfolobus*.
- 确定参与古人类基因组分离和分裂的监管检查点和关键蛋白质.
- 为了比较古人类的分裂策略与真核生物的分裂策略.
主要方法:
- 活细胞成像被用来观察*Sulfolobus*中的DNA组织和细胞分裂动态.
- 计算机建模用于分析DNA组织在基因组分离中的作用.
- 进行了扰乱分析,以确定监管检查点和基本蛋白质.
主要成果:
- 在*Sulfolobus*细胞分裂期间DNA组织的序列变化被描述为,有助于基因组分离.
- 确定了一个监管检查点,确保在分裂环组装后才能将基因组压缩成分离的核素.
- 发现ParA同类物,SegA及其伴侣SegB对于DNA紧缩和分离至关重要,它们的缺席导致DNA桥接.
结论:
- 考古细胞分裂利用监管检查点来确保高保真基因组分布,类似于真核生物.
- 这项研究阐明了SegA和SegB在古人类DNA分离和分裂中的作用.
- 这些发现揭示了细胞周期调节和基因组稳定机制的演变.
相关概念视频
01:24Nucleoid
838
The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
838
02:15Condensins
4.5K
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...
4.5K
01:32Replication in Prokaryotes
27.5K
DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
27.5K
02:35Replication in Prokaryotes
96.8K
Overview
96.8K
01:26Binary Fission
2.3K
Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
2.3K
01:20Binary Fission
62.8K
Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
62.8K