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相关概念视频

Telomeres and Telomerase02:41

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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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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.
Many Proteins Orchestrate Replication at the Origin
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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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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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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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在端粒维护过程中,TERRA R循环触发了转向断裂诱导的复制和PRIMPOL依赖的修复的转换.

Suna In1, Patricia Renck Nunes1,2, Rita Valador Fernandes1,3

  • 1Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, 1015, Switzerland.

The EMBO journal
|July 7, 2025
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概括

TERRA长非编码RNA在端粒中形成R环,需要RAD51和RAD51AP1. 这些R环通过断裂诱导复制 (BIR) 和PRIMPOL依赖修复促进端粒维护,这对ALT癌细胞存活至关重要.

关键词:
断裂诱导的复制是因为普林波尔 (Primpol) 是一个小行星.在R-Loop中使用.在地球上,地球是地球.端粒是什么意思 端粒是什么意思

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科学领域:

  • 遗传学 遗传学 是一个
  • 分子生物学分子生物学
  • 癌症研究 癌症研究

背景情况:

  • 端粒对染色体稳定至关重要,并通过端粒酶或替代端粒延长 (ALT) 维持.
  • 长非编码RNA涉及到端粒维护,但它们的确切功能尚不清楚.
  • R环,DNA:RNA混合体,在端粒上形成,可能在TERRA介导的调节中发挥作用.

研究的目的:

  • 研究TERRA长非编码RNA调节端粒维护的机制.
  • 确定RAD51,RAD51AP1和PRIMPOL在TERRA R环形成和端粒修复中的作用.
  • 阐明TERRA R环如何影响ALT癌细胞中的DNA复制和修复途径.

主要方法:

  • 在端粒酶表达细胞中诱导TERRA转录和R环形成.
  • 评估RAD51和RAD51AP1对TERRA R循环形成的要求.
  • 使用半保守的DNA复制试验,研究TERRA R循环对DNA复制的影响.
  • 分析PRIMPOL在DNA修复和端粒维护中的作用.
  • 在U2OS ALT癌细胞中评估PRIMPOL枯竭和BIR缺乏之间的合成致死性.

主要成果:

  • TERRA R-循环的形成需要 RAD51 和 RAD51AP1.1 的非冗余功能.
  • 泰拉R环阻碍半保守的DNA复制,通过破裂诱导复制 (BIR) 通过同质导向修复 (HDR) 促进端粒维护.
  • TERRA诱导了PRIMPOL依赖的修复,它启动了复制障碍的下游的DNA合成,与BIR平行作用,用于端粒维护和细胞存活.
  • 在 U2OS ALT 癌细胞中,PRIMPOL 枯竭表现出合成致命性与 BIR 缺乏.
  • 单独的TERRA R环就足以触发ALT典型的端粒修复机制,而没有其他标志性ALT染色质变化.

结论:

  • TERRA R环是ALT癌细胞中端粒维持的关键媒介.
  • RAD51/RAD51AP1复合体对于TERRA的R循环形成至关重要.
  • TERRA R-循环参与了依赖BIR和PRIMPOL的修复通路,以确保端粒稳定性和癌细胞存活.
  • 在ALT癌症中,TERRA诱导的R循环代表了一种新的治疗脆弱性.