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Related Concept Videos

The DNA Replication Fork01:02

The DNA Replication Fork

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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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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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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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The Replisome03:01

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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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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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Quantifying Replication Stress in Ovarian Cancer Cells Using Single-Stranded DNA Immunofluorescence
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Exploiting Replication Stress as a Novel Therapeutic Intervention.

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Ewing sarcoma, a pediatric cancer, has high replication stress. Understanding this stress may reveal new targeted therapies, offering hope for better treatments.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Ewing sarcoma is an aggressive pediatric bone and soft tissue tumor.
  • Current treatments (radiation, chemotherapy) lack targeted therapies.
  • Ewing sarcoma exhibits elevated replication stress, a poorly understood feature.

Purpose of the Study:

  • To review the current understanding of replication stress and DNA damage response in Ewing sarcoma.
  • To explore the source of elevated replication stress in this cancer.
  • To identify novel therapeutic targets and interventions.

Main Methods:

  • Literature review of existing research on Ewing sarcoma.
  • Analysis of replication stress and DNA damage response pathways.
  • Exploration of therapeutic strategies targeting these pathways.

Main Results:

  • Replication stress is a key feature of Ewing sarcoma.
  • Tumor cells with high replication stress depend on DNA damage response pathways for survival.
  • Targeting these pathways is a promising therapeutic strategy.

Conclusions:

  • Understanding replication stress in Ewing sarcoma can identify new therapeutic targets.
  • Replication stress is an exploitable vulnerability in Ewing sarcoma and other cancers.
  • Novel, evidence-based interventions targeting these pathways are needed for improved patient outcomes.