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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...

Restarting Stalled Replication Forks

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: May 21, 2026

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

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

Published on: August 30, 2024

Telomere end processing: unexpected complexity at the end game.

Victoria Lundblad¹

¹Salk Institute for Biological Studies, La Jolla, California 92037, USA. lundblad@salk.edu

Genes & Development

|June 5, 2012

Summary

This summary is machine-generated.

Human cells typically lack telomerase, leading to telomere shortening that limits cell lifespan and impacts aging. A new study reveals a crucial, previously unappreciated process in chromosome end maturation, vital for telomere dynamics and potentially life span.

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Last Updated: May 21, 2026

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

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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

Area of Science:

Cellular biology
Genetics
Molecular biology

Background:

Most human cells lack the enzyme telomerase, responsible for elongating telomeres.
Telomere erosion limits cell proliferation and tissue renewal, contributing to age-dependent diseases.
Telomere length is correlated with lifespan, but the underlying mechanisms are not fully understood.

Purpose of the Study:

To elucidate the sequence of events involved in processing newly replicated chromosome ends into mature telomeres.
To investigate the contribution of chromosome end processing to telomere dynamics.
To understand factors influencing the correlation between lifespan and telomere length.

Main Methods:

The study employed advanced techniques to observe the processing of chromosome ends.
Detailed analysis of the molecular events occurring at telomeres after replication.
Investigated the role of specific protein complexes in telomere maturation.

Main Results:

A highly choreographed sequence of events was revealed for the maturation of newly replicated chromosome ends.
This process involves an underappreciated contribution to telomere dynamics.
The findings suggest this processing pathway is critical for maintaining telomere length and function.

Conclusions:

The processing of chromosome ends into mature telomeres is a critical, orchestrated mechanism.
This pathway's contribution to telomere dynamics may be as significant as telomerase activity.
Understanding this process offers new insights into aging and age-related pathologies.