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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 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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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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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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Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
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Exploring and exploiting the systemic effects of deregulated replication licensing.

Theodoros G Petrakis1, Eirini-Stavroula Komseli1, Marilena Papaioannou1

  • 1Molecular Carcinogenesis Group, Department of Histology and Embryology, School of Medicine, University of Athens, Athens, Greece.

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Summary

Accurate DNA replication is vital for health. Deregulation of replication licensing, crucial for preventing re-replication, contributes to cancer and genetic disorders, offering therapeutic targets.

Keywords:
CancerCdc6Cdt1Replication licensing factorsReplication stress

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Biology

Background:

  • Accurate DNA replication ensures genomic stability and proper cell function.
  • The replication licensing machinery controls DNA replication, ensuring it occurs once per cell cycle.
  • Re-replication, a failure of this control, causes replication stress and genomic instability, a cancer hallmark.

Purpose of the Study:

  • To review the mechanistic basis of replication licensing deregulation.
  • To discuss the systemic effects of this deregulation, including carcinogenesis and genetic syndromes.
  • To explore new insights into the role of Cdc6 as a transcriptional regulator and ChlR1/DDX11 in cancer.

Main Methods:

  • Literature review of replication licensing mechanisms.
  • Analysis of the role of key factors like Cdc6 and ChlR1/DDX11.
  • Discussion of implications for genetic syndromes and cancer.

Main Results:

  • Replication licensing deregulation is linked to carcinogenesis and genetic syndromes.
  • Cdc6 functions as a global transcriptional regulator above a certain threshold.
  • ChlR1/DDX11 mutations are implicated in Warsaw Breakage Syndrome and potentially cancer.

Conclusions:

  • Replication licensing deregulation has significant systemic consequences, including cancer.
  • Cdc6 and ChlR1/DDX11 are key players in genomic stability and disease.
  • Targeting replication licensing factors presents potential therapeutic strategies, particularly for cancer.