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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

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...

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...

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Related Experiment Video

Updated: Jun 21, 2026

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

[Telomere].

Kaiyo Takubo¹, Ken-ichi Nakamura, Naotaka Shimomura

¹Research Team for Aging-related Diseases, Tokyo Metropolitan Institute of Gerontology.

Nihon Rinsho. Japanese Journal of Clinical Medicine

|July 14, 2009

Summary

Telomere shortening correlates with aging and cancer development. Studies show shorter telomeres in cancer patients

Area of Science:

Genetics
Cell Biology
Oncology

Context:

Telomere length is a known biomarker for cellular aging.
Telomere shortening is observed in various human tissues with age.
The relationship between telomere dynamics and cancer development requires further elucidation.

Purpose:

To investigate the correlation between telomere length, aging, and carcinogenesis.
To analyze telomere length variations in individual cell types within human tissues.
To determine if telomere length differences in normal tissues correlate with cancer presence.

Summary:

Southern blot analysis revealed age-related telomere shortening in most human tissues, excluding brain and myocardium.
Quantitative fluorescence in situ hybridization (Q-FISH) and "Tissue Telo" software showed significant telomere length differences among epithelial cell types, with regression in most cell types.

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

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Last Updated: Jun 21, 2026

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

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

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

Mean telomere length was significantly reduced in the background squamous epithelia of cancer patients compared to normal controls, indicating a link between short telomeres, chromosomal instability, and cancer initiation.

Impact:

Provides evidence that cancer may originate from epithelial cells with critically short telomeres.
Highlights the role of telomere length and chromosomal instability in the early stages of carcinogenesis.
Suggests potential for telomere length as a biomarker for cancer risk assessment.