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Telomeres and Telomerase

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 Telomerase

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 Eukaryotes

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 Eukaryotes

Replication in Eukaryotes

Replicative Cell Senescence

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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Related Experiment Video

Updated: Jul 13, 2026

Optimization of Performance Parameters of the TAGGG Telomere Length Assay

Optimization of Performance Parameters of the TAGGG Telomere Length Assay

Published on: April 21, 2023

Telomere length analysis.

Andrés Canela¹, Peter Klatt, María A Blasco

¹Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Center, Madrid, Spain.

Methods in Molecular Biology (Clifton, N.J.)

|July 20, 2007

Summary

Telomere shortening impacts cell viability and tissue function, making telomere length a key biomarker for aging. New methods improve telomere length measurement for human aging studies.

Area of Science:

Gerontology
Molecular Biology
Biomarkers

Background:

Somatic cells in long-lived species experience progressive telomere shortening.
Critically short telomeres impair cell viability, affecting tissue function and regeneration.
This links telomere length to aging and age-related diseases.

Purpose of the Study:

To review recent advancements in telomere length quantification methodologies.
To discuss the application of these methods in human aging research.

Main Methods:

Review of current literature on telomere length measurement techniques.
Comparison of novel methods with conventional telomeric Southern blot.

Main Results:

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

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Optimization of Performance Parameters of the TAGGG Telomere Length Assay

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Modified Terminal Restriction Fragment Analysis for Quantifying Telomere Length Using In-gel Hybridization

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

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

Published on: May 22, 2013

Significant improvements in accuracy and sensitivity of telomere length quantification.

Emerging methods offer enhanced potential for aging studies.

Conclusions:

Accurate telomere length measurement is crucial for understanding human aging.
Novel methodologies are vital for evaluating telomere dynamics in aging and disease.