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相关概念视频

Restarting Stalled Replication Forks02:37

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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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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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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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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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    在DNA复制后,RIF1蛋白有助于重新建立基因素标记. 它招募关键酶在G1阶段恢复H3K9me3水平,确保适当的表观遗传身份.

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    科学领域:

    • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
    • 分子生物学分子生物学
    • 细胞循环规则 细胞循环规则

    背景情况:

    • DNA复制稀释了亲基因组和它们的修饰.
    • 基因质标记的恢复动力学决定了表观遗传特征的复制后恢复.
    • H3K9me3的恢复是缓慢的,持续到G1阶段,机理不明.

    研究的目的:

    • 为了阐明DNA复制后缓慢恢复H3K9me3背后的分子机制.
    • 研究RIF1在H3K9me3溶解过程中的作用.

    主要方法:

    • 染色体免疫沉测定. 染色体免疫沉测定.
    • 分析基因素修饰的情况 (H3K9me3,H3S10ph).
    • 研究蛋白质与蛋白质的相互作用 (RIF1,SUV39H1,HP1,PP1α,奥罗拉酶).

    主要成果:

    • 在线粒出口时,RIF1与异性染色素的重新关联对于H3K9me3沉积至关重要.
    • RIF1招募SUV39H1,HP1α和HP1β,促进G1.1中的H3K9三甲基化.
    • RIF1招募PP1α,它们的相互作用对于维持H3K9me3水平至关重要.
    • RIF1-PP1复合物抑制了 Aurora 激酶,防止了 H3S10 的过早酸化,并允许 H3K9me3 的恢复.

    结论:

    • 在复制后,RIF1主导着对色素蛋白的恢复.
    • 通过协调基因组甲基转移酶和酸酶,RIF1可确保及时恢复H3K9me3.
    • RIF1作为细胞分裂间表观遗传记忆维护的关键调节器.