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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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Related Experiment Video

Updated: Mar 11, 2026

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Replication, checkpoint suppression and structure of centromeric DNA.

Francesco Romeo1, Lucia Falbo1, Vincenzo Costanzo1

  • 1a DNA metabolism laboratory, IFOM, The FIRC institute for Molecular Oncology , Milan , Italy.

Nucleus (Austin, Tex.)
|November 29, 2016
PubMed
Summary
This summary is machine-generated.

Human centromeres use alpha satellite DNA, which is hard to replicate. Our study reveals how centromeric chromatin structure, protein binding, and checkpoint suppression ensure DNA replication and genome stability.

Keywords:
ATR pathwayDNA damageDNA replicationgenomic-genetic instabilitystress response

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Area of Science:

  • Molecular Biology
  • Genetics
  • Chromatin Biology

Background:

  • Human centromeres are composed of repetitive alpha satellite DNA, posing replication challenges.
  • The functional roles of centromeric DNA and its associated proteins remain incompletely understood.
  • Centromeric chromatin structure is critical for chromosome segregation and genome stability.

Purpose of the Study:

  • To characterize the protein composition and structural organization of reconstituted centromeric chromatin.
  • To investigate the response of centromeric chromatin to stalled replication forks.
  • To elucidate the mechanisms underlying efficient replication of centromeric DNA.

Main Methods:

  • Reconstitution of centromeric chromatin in Xenopus laevis egg extract.
  • Analysis of protein binding affinities, including SMC2-4 and CENP-A.
  • Assessment of DNA repair factor enrichment and ATR checkpoint response.
  • Investigation of DNA loop formation and topological constraints.

Main Results:

  • Centromeric DNA exhibits high affinity for condensin subunits (SMC2-4) and CENP-A.
  • Centromeric chromatin is enriched for DNA repair factors.
  • ATR checkpoint is suppressed to facilitate efficient replication of centromeric DNA.
  • Condensin-enriched, topologically constrained DNA loops are formed within centromeric chromatin.

Conclusions:

  • Centromeric chromatin structure and protein composition facilitate efficient DNA replication.
  • Suppression of the ATR checkpoint is crucial for replicating challenging centromeric sequences.
  • Topologically constrained DNA loops contribute to centromere organization and function.
  • These findings provide insights into chromosome organization and genome stability in mammals.