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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

Next-generation Sequencing

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.

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: Jun 1, 2026

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

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

Published on: July 10, 2017

TECHNICAL ADVANCES: New strategies for telomere-based age estimation.

Mark F Haussmann¹, Robert A Mauck

¹Department of Biology, Kenyon College, OH 43022, USA.

Molecular Ecology Resources

|May 19, 2011

Summary

This study introduces a new method to reliably measure telomere length in animal blood, focusing on the shortest telomeres for accurate age estimation and understanding life-history traits.

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Optimization of Performance Parameters of the TAGGG Telomere Length Assay

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Last Updated: Jun 1, 2026

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

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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

Area of Science:

Ecology and evolutionary biology
Gerontology
Molecular biology

Background:

Telomere length variation influences life-history traits and is used for age estimation in wild populations.
Standardization is lacking in telomere length measurement methods, impacting data reliability.
Telomere dynamics connect molecular processes to organismal traits.

Purpose of the Study:

To present novel laboratory and analytical methods for reliable telomere length measurement in blood erythrocytes.
To accurately assess the relationship between telomere length and age, emphasizing the shortest telomeres.
To introduce a method for identifying an optimal analysis window for age estimation.

Main Methods:

Development of new laboratory techniques for telomere length measurement from blood erythrocytes.
Introduction of the telomere optimal estimate (TOE) to identify the shortest telomeres relevant for age estimation.
Comparison of constant- and pulsed-field gel electrophoresis for telomere measurement.

Main Results:

A reliable method for measuring telomere length and assessing age-related changes was demonstrated.
The telomere optimal estimate (TOE) window effectively focuses on the shortest telomeres, crucial for senescence and aging.
The study highlights how different electrophoresis methods impact telomere length measurements.

Conclusions:

The proposed methods offer reliable telomere-based age estimation in organismal biology.
The TOE facilitates accurate age estimation and comparison of telomere dynamics in age-matched individuals.
Standardized methods, like TOE, are essential for advancing research on telomere dynamics and life-history traits.