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Related Concept Videos

Replication in Eukaryotes01:29

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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.
Many Proteins Orchestrate Replication at the Origin
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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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In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded...
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Quantifying Replication Stress in Ovarian Cancer Cells Using Single-Stranded DNA Immunofluorescence
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Telomere replication-When the going gets tough.

Susanna Stroik1, Eric A Hendrickson2

  • 1Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, 27599, United States.

DNA Repair
|July 11, 2020
PubMed
Summary
This summary is machine-generated.

Telomere replication is challenging due to repetitive DNA and obstructions, leading to genomic instability. This study reviews mechanisms that maintain telomeres and combat replication fork collapse, crucial for preventing cell death and cancer.

Keywords:
Chromatin bridgesHomology-dependent repairReplicationRestartStalled forksTelomere

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Telomeres are repetitive DNA sequences protecting chromosome ends.
  • Telomeres are late-replicating and prone to replication stress, stalling, and fork collapse.
  • Replication failure at telomeres can cause DNA deletions, translocations, fusions, and genomic instability.

Purpose of the Study:

  • To review recent advances in understanding molecular mechanisms that facilitate DNA replication through telomeric regions.
  • To summarize pathways that counteract the detrimental effects of telomeric replication fork collapse.
  • To highlight the importance of telomere maintenance for genomic stability and organismal health.

Main Methods:

  • Review of recent scientific literature on telomere replication and maintenance.
  • Analysis of molecular mechanisms involved in escorting the replisome through telomeric structures.
  • Examination of pathways that resolve or prevent replication fork collapse at telomeres.

Main Results:

  • Identification of molecular factors that help the replication machinery navigate repetitive telomeric sequences.
  • Description of cellular pathways that prevent or repair DNA damage arising from telomere replication stress.
  • Elucidation of the link between aberrant telomere replication and genomic instability, including oncogenic transformation.

Conclusions:

  • Effective telomere replication and maintenance are critical for preventing genomic instability.
  • Understanding these mechanisms offers insights into cellular aging, senescence, and cancer development.
  • Further research into telomere maintenance pathways is essential for therapeutic strategies targeting diseases associated with genomic instability.