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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.

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...

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...

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

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Related Experiment Video

Updated: Jul 8, 2026

SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs

SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs

Published on: June 28, 2019

Telomerase, senescence and ageing.

May Shawi¹, Chantal Autexier

¹Department of Medicine, Division of Experimental Medicine, McGill University, Canada.

Mechanisms of Ageing and Development

|January 25, 2008

Summary

This summary is machine-generated.

Short telomeres trigger cellular senescence, a tumor suppression pathway. Understanding telomere regulation is key for therapies targeting aging and cancer.

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Last Updated: Jul 8, 2026

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Induction and Validation of Cellular Senescence in Primary Human Cells

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

Area of Science:

Molecular Biology
Cell Biology
Oncology

Background:

Telomeres protect chromosome ends from DNA damage.
Telomerase maintains telomere length.
Telomere dysfunction can lead to cellular senescence, a state of permanent cell cycle arrest.

Purpose of the Study:

To review regulators of cellular senescence.
To discuss in vivo evidence linking short telomeres to p53-dependent tumor suppression.
To explore the dual role of telomerase in aging and cancer.

Main Methods:

Literature review of key regulators of cellular senescence.
Analysis of in vivo studies on telomere length and senescence.
Discussion of therapeutic implications of telomerase modulation.

Main Results:

Short telomeres induce p53-dependent senescence, acting as a tumor suppressor.
Cellular senescence is linked to tumor regression in vivo.
Short telomere length is associated with aging and various diseases.

Conclusions:

Telomere maintenance and cellular senescence are critical in cancer and aging.
Telomerase activation may combat aging and aid tissue regeneration.
Telomerase inhibition offers a potential cancer therapy for p53-intact tumors.
Further research is needed to harness telomerase's complex regulatory roles for therapeutic benefit.