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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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The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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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...
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Epigenetic Regulation01:46

Epigenetic Regulation

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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相关实验视频

Updated: Feb 7, 2026

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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叉反转保护在复制压力过程中表观遗传遗传.

Wenpeng Liu, Qiong Wu, Caixian Zhou

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    概括

    复制叉反转对于在DNA复制压力期间保持表观遗传稳定至关重要. 缺乏这种过程的细胞会失去父母组织蛋白,影响表观遗传和细胞身份.

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    相关实验视频

    Last Updated: Feb 7, 2026

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    科学领域:

    • 分子生物学分子生物学
    • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
    • 基因组学就是基因组学.

    背景情况:

    • 基因表观信息由基因组修饰所携带,对细胞身份至关重要,并且通常在DNA复制过程中传播.
    • 对表观遗传遗传忠实性的DNA复制扰乱的影响仍然在很大程度上是未知的.

    研究的目的:

    • 研究复制叉逆转在维持在复制压力下表观遗传信息传输中的作用.
    • 阐明复制叉缺陷影响表观遗传稳定性的分子机制.

    主要方法:

    • 对复制分叉在具有和没有分叉逆转的细胞中核细胞密度的分析.
    • 追踪父母组织激素转移到新生DNA上的过程.
    • 调查PrimPol,PARylation和DNA-蛋白交联在缺陷分叉逆转细胞中的作用.

    主要成果:

    • 在复制分叉逆转过程中出现缺陷的细胞在复制分叉过程中表现出核细胞密度的降低和父基因组的损失.
    • 这些细胞中的PrimPol激活会导致单链DNA缺口.
    • 在这些缺口上,PARylation和DNA-蛋白质交叉连接有助于核细胞损失.

    结论:

    • 复制分叉逆转对于DNA复制压力期间表观遗传信息的忠实传输至关重要.
    • 这一过程既保证了基因组的完整性,也保证了表观遗传的稳定性,从而确保了细胞的同一性.