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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

Chromosome Structure

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...

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 10, 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

Structural identity of telomeric complexes.

Marie-Josèphe Giraud-Panis¹, Sabrina Pisano, Anaïs Poulet

¹University de Nice, Laboratory of Biology and Pathology of Genomes, UMR 6267 CNRS U998 INSERM, Faculté de Médecine, Nice, France.

|August 11, 2010

Summary

This summary is machine-generated.

Telomeres protect chromosome ends using complex DNA, RNA, and protein networks. These structures ensure proper replication and cell cycle integrity, guiding cell fate.

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Last Updated: Jun 10, 2026

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

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In vitro Reconstitution of the Active T. castaneum Telomerase

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Published on: July 14, 2011

Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

Telomere integrity is crucial for chromosome end protection and replication.
Existing nucleoprotein complexes at telomeres do not fully explain their structural identity or function.
Understanding telomere structure is key to masking chromosome ends from DNA repair pathways.

Purpose of the Study:

To review and compare the structure of telomeric nucleoprotein complexes across different organisms.
To link telomere structure to telomere biology and function.
To elucidate how these complexes ensure telomere integrity and replication.

Main Methods:

Comparative review of telomeric nucleoprotein complex structures.
Analysis of interactions between DNA, RNA, and proteins at telomeres.
Linking structural organization to functional outcomes in telomere biology.

Main Results:

Telomeres are formed by intricate networks of DNA, RNA, and protein interactions.
These interactions are mutually reinforcing, ensuring robust telomere function.
Telomeric structures are dynamic and influence cell fate.

Conclusions:

Telomeric nucleoprotein complexes provide structural identity to chromosome ends.
The complex interplay of molecules within telomeres guarantees their stability.
Dynamic structural transitions in telomeres play a role in orienting cell fate.