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Related Concept Videos

Telomeres and Telomerase02:41

Telomeres and Telomerase

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 DNA.
Telomeres and Telomerase02:41

Telomeres and Telomerase

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 DNA.
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Replication in Eukaryotes01:29

Replication in Eukaryotes

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
Eukaryotic replication follows many of the same...
Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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, a...

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Related Experiment Video

Updated: Jun 18, 2026

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
11:21

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers

Published on: August 30, 2024

How telomeres solve the end-protection problem.

Titia de Lange1

  • 1Laboratory of Cell Biology and Genetics, Rockefeller University, New York, NY 10021, USA. delange@mail.rockefeller.edu

Science (New York, N.Y.)
|December 8, 2009
PubMed
Summary
This summary is machine-generated.

Telomeres protect eukaryotic chromosome ends from being recognized as DNA damage, preventing cell cycle arrest and maintaining genome integrity. Their structure varies across species to adapt to different cellular defense mechanisms.

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Last Updated: Jun 18, 2026

Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Eukaryotic chromosome ends pose a risk of being identified as DNA damage by cellular repair pathways.
  • Failure to protect chromosome ends can lead to cell cycle arrest and compromised genome integrity.
  • Telomeres are specialized protein-DNA complexes that solve the chromosome end-protection problem.

Purpose of the Study:

  • To elucidate the mechanism by which telomeres disguise chromosome ends in mammalian cells.
  • To compare telomere protection strategies between mammalian and unicellular eukaryotes.
  • To understand how variations in DNA damage response systems influence telomere structure and composition.

Main Methods:

  • Studies involving mammalian cell lines.
  • Comparative analysis of telomere structures and functions across different eukaryotic organisms.
  • Investigation of cellular DNA damage response pathways.

Main Results:

  • Mammalian telomeres employ specific mechanisms to mask chromosome ends from DNA damage sensors.
  • Significant differences exist in DNA damage response systems between mammalian and unicellular eukaryotes.
  • Telomere structure and composition are adapted to the specific variations in these cellular defense systems.

Conclusions:

  • Telomeres are crucial for preventing inappropriate activation of DNA damage responses at chromosome termini.
  • The variability in telomere structure reflects evolutionary adaptations to diverse cellular environments and defense mechanisms.
  • Understanding telomere function is key to maintaining genome stability in eukaryotes.