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Related Concept Videos

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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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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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 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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S-Cdk Initiates DNA Replication02:38

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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).
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[SAMHD1 acts at stalled replication forks to prevent interferon induction].

F Coquel1, M J Silva2, H Técher3

  • 1Institut de Génétique Humaine, CNRS, Université de Montpellier, Laboratoire Maintien de l'Intégrité du Génome au cours de la Réplication, Ligue Contre le Cancer, Montpellier, France.

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Summary

Replicative stress generates cytosolic DNA fragments in SAMHD1-deficient cells, activating the interferon response. This links DNA replication stress to inflammation, impacting Aicardi-Goutières syndrome and cancer therapies.

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Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • Replicative stress, caused by obstacles during DNA replication, is implicated in cancer development.
  • The interferon pathway, a defense against pathogens, can be activated by cytosolic DNA.
  • Aicardi-Goutières syndrome involves chronic inflammation linked to potential DNA replication-derived cytosolic DNA.

Purpose of the Study:

  • To investigate the role of SAMHD1 in processing stalled replication forks and its connection to the interferon response.
  • To elucidate the mechanisms by which DNA replication stress leads to cytosolic DNA accumulation and inflammation.
  • To establish a link between SAMHD1 deficiency, replication stress, and the activation of innate immunity.

Main Methods:

  • Cellular assays to detect cytosolic DNA accumulation in SAMHD1-deficient cells under replicative stress.
  • In vitro experiments assessing SAMHD1's interaction with nucleases like MRE11.
  • Analysis of DNA replication restart mechanisms and DNA fragment generation in the absence of SAMHD1.

Main Results:

  • Cytosolic DNA accumulates in SAMHD1-deficient cells, particularly under replicative stress, activating the interferon response.
  • SAMHD1 is crucial for processing stalled replication forks and promoting replication restart, independent of its dNTPase activity.
  • SAMHD1 stimulates MRE11 exonuclease activity; its absence leads to MRE11/RECQ1-mediated DNA resection, producing cytosolic DNA fragments and activating interferon signaling.

Conclusions:

  • SAMHD1 deficiency leads to replication fork degradation by MRE11/RECQ1, generating cytosolic DNA that triggers the interferon response.
  • This study reveals a direct link between replicative stress response and interferon production.
  • Findings have implications for understanding Aicardi-Goutières syndrome, SAMHD1-related cancers, and optimizing anti-tumor therapies involving the interferon pathway.