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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 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...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
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...
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...

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Updated: May 31, 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

Blood cell telomere length is a dynamic feature.

Ulrika Svenson1, Katarina Nordfjäll, Duncan Baird

  • 1Department of Medical Biosciences, Pathology, Umeå University, Umeå, Sweden.

Plos One
|July 2, 2011
PubMed
Summary

Blood cell telomere length (TL) fluctuates over time, influenced by baseline length and environmental factors. This dynamic feature, observed over six months, suggests an oscillating pattern in telomere length.

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Area of Science:

  • Human biology
  • Genetics
  • Cellular aging

Background:

  • Blood cell telomere length (TL) exhibits significant individual heterogeneity.
  • TL is influenced by inheritance, lifestyle, and environmental factors, implying dynamic changes over a lifetime.

Purpose of the Study:

  • To analyze the dynamic changes in relative telomere length (RTL) over a six-month period.
  • To investigate the relationship between RTL changes and baseline RTL.
  • To understand the implications of TL dynamics in human telomere biology.

Main Methods:

  • Analysis of relative TL (RTL) in blood samples from 50 individuals taken six months apart.
  • Comparison of RTL changes with baseline RTL.
  • Verification of PCR-determined RTL changes using Southern blotting and STELA (single telomere elongation length analysis).

Main Results:

  • Significant associations were found between RTL changes and baseline RTL.
  • Individual RTL changes per month were more pronounced than those observed over longer follow-up periods.
  • One donor showed marked telomere loss within six months, followed by stabilization, with decreased telomere heterogeneity and loss of longest telomeres.

Conclusions:

  • Individual blood cell telomere length is a dynamic and oscillating feature.
  • TL dynamics are influenced by baseline length and can exhibit rapid changes.
  • Recognizing TL as a dynamic feature is crucial for future human telomere biology studies.