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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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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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ecDNA replication is disorganized and vulnerable to replication stress.

Jedrzej J Jaworski1, Pauline L Pfuderer2,3, Pawel Czyz4,5

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Summary

Extrachromosomal DNA (ecDNA) replicates asynchronously in cancer cells, unlike chromosomal DNA. This study reveals ecDNA replication differences that could lead to new cancer therapies targeting oncogene amplification.

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • Extrachromosomal DNA (ecDNA) drives cancer progression, tumor growth, evolution, and therapeutic resistance via oncogene amplification.
  • The replication mechanisms of ecDNA are not well understood, hindering the development of targeted therapies.

Purpose of the Study:

  • To investigate the replication dynamics of ecDNA using advanced molecular techniques.
  • To compare ecDNA replication with chromosomal DNA replication and chromosomally reintegrated ecDNA.

Main Methods:

  • Utilized high-resolution replication timing analysis (Repli-seq) and DNAscent to measure origin firing and replication fork movement.
  • Employed Fluorescence-activated cell sorting-based Isolation of Native ecDNA (FINE) to isolate chromatinized ecDNA without digestion.
  • Applied methods to bulk DNA, isolated ecDNA, and chromosomally reintegrated ecDNA in cancer and control cell lines.

Main Results:

  • Demonstrated that ecDNA in COLO 320DM cells exhibits asynchronous replication throughout S phase, differing from chromosomal DNA.
  • Observed redistributed replication origins, reduced replication fork velocity, and increased fork stalling on ecDNA.
  • Found that replication stress (hydroxyurea) further compromises ecDNA replication, leading to altered origin activation and ecDNA depletion.

Conclusions:

  • Revealed fundamental differences in ecDNA replication dynamics compared to chromosomal DNA.
  • These findings provide crucial insights into ecDNA's role in cancer and potential therapeutic strategies targeting oncogene amplification.