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相关概念视频

Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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Spreading of Chromatin Modifications02:25

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
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DNA Helicases00:55

DNA Helicases

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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Crossing Over01:30

Crossing Over

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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S-Cdk Initiates DNA Replication02:38

S-Cdk Initiates DNA Replication

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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
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BAHCC1与H4K20me1结合,以促进MCM复杂载荷和DNA复制.

Dongxu Li1,2, Zhi-Min Zhang3,4, Liu Mei1

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Nature communications
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BAHCC1 串联图多尔域 (TTD) 读取 histone H4K20me1,促进DNA复制原始激活. 这种相互作用招募MCM复合体,对细胞周期进展和DNA修复至关重要.

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科学领域:

  • 表观遗传学和染色体生物学
  • DNA复制的分子机制
  • 细胞周期调节细胞周期调节

背景情况:

  • 基因组修饰,如基因组H4 lysine 20 (H4K20me1) 的单甲基化,在调节基本细胞过程中起着至关重要的作用.
  • 通过H4K20me1影响DNA复制,细胞周期进展和DNA损伤修复的精确机制尚未完全理解.

研究的目的:

  • 阐明 BAHCC1 串联 Tudor 域 (BAHCC1TTD) 在识别 H4K20me1.1 中的作用.
  • 研究BAHCC1TTD介导的H4K20me1识别如何促进DNA复制起源激活和整体DNA复制.

主要方法:

  • 生物化学测试以评估蛋白质与蛋白质相互作用和结合特异性.
  • 结构生物学来确定BAHCC1TTD和H4K20me1.1之间的相互作用接口.
  • 基因组分析用于绘制招募地点的地图,并评估全基因组效应.
  • 细胞实验评估BAHCC1枯竭或BAHCC1TTD:H4K20me1相互作用干扰对DNA复制和细胞周期进展的影响.

主要成果:

  • BAHCC1TTD选择性地与H4K20me1结合,使其与其他甲基化状态区别开来.
  • BAHCC1TTD促进了BAHCC1和迷你染色体维护 (MCM) 综合体的招募到复制起源.
  • BAHCC1TTD和H4K20me1之间的相互作用,以及源识别复合体 (ORC) 读取H4K20me2的相互作用,对于MCM加载和复制源激活至关重要.
  • BAHCC1的耗尽或 BAHCC1TTD:H4K20me1相互作用的破坏损害了MCM负载,导致复制缺陷和细胞周期进展问题.

结论:

  • BAHCC1TTD作为一个关键的效应因子,将H4K20me1信号转化为MCM复合物的招募.
  • 这种机制对于有效的DNA复制原始激活和随后的细胞周期进展至关重要.
  • 这项研究揭示了一种新的表观遗传调节途径,通过特定的基因素标记识别来控制DNA复制启动.