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Related Concept Videos

Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
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.
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...
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...
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.

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Related Experiment Video

Updated: Jul 10, 2026

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
12:08

Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence

Published on: May 22, 2013

Measuring vertebrate telomeres: applications and limitations.

Shinichi Nakagawa1, Neil J Gemmell, Terry Burke

  • 1Department of Animal and Plant Sciences, University of Sheffield, S10 2TN, UK.

Molecular Ecology
|August 19, 2004
PubMed
Summary

Telomere length, DNA sequences at chromosome ends, correlates with age and lifespan. This offers a potential tool for estimating age and survival in wild vertebrate populations.

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Area of Science:

  • Genetics and Molecular Biology
  • Ecology and Evolutionary Biology
  • Conservation Biology

Background:

  • Telomeres are protective DNA sequences at eukaryotic chromosome ends.
  • Shorter telomeres are linked to increased organismal age within species.
  • Telomere shortening rates correlate with lifespan across species.

Purpose of the Study:

  • To review methods for measuring telomere length.
  • To discuss the utility of telomeres as estimators of age and aging in wildlife.
  • To explore applications in vertebrate ecology, evolution, and conservation.

Main Methods:

  • Review of existing literature on telomere measurement techniques.
  • Analysis of correlations between telomere length, age, and lifespan.
  • Discussion of methodological challenges and potential biases.

Main Results:

  • Telomere length is a potential biomarker for age and survival.
  • Significant correlations observed between telomere dynamics and organismal lifespan.
  • Variability in telomere length and shortening rates exists across species.

Conclusions:

  • Telomere length offers a promising, non-invasive method for assessing age and aging in natural populations.
  • Further research is needed to refine telomere-based estimation methods for ecological and conservation applications.
  • Understanding telomere dynamics is crucial for assessing population health and evolutionary trajectories.