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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.

The Nucleus

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

The Nucleus

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

The Nucleus

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
The regulation of gene expression inside the nucleus is dependent on many factors, including the DNA structure. The...

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...

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Related Experiment Video

Updated: May 25, 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

Telomeres and the nucleus.

Clara Lopes Novo¹, J Arturo Londoño-Vallejo

¹Telomeres & Cancer Laboratory, UMR3244, Institut Curie-CNRS-UPMC, 26 rue d'Ulm, 75248 Paris Cedex 05, France.

Seminars in Cancer Biology

|February 15, 2012

Summary

Telomeres cap chromosome ends to maintain genome stability. Their nuclear organization and dynamics are influenced by cellular processes and are altered in cancer.

Area of Science:

Genomics
Cell Biology
Nuclear Architecture

Background:

Telomeres protect chromosome ends from degradation and fusion.
Telomeres are mobile and interact with nuclear compartments, varying across organisms and cells.
Nuclear architecture changes during cellular processes like replication, repair, and telomere elongation.

Purpose of the Study:

To review the relationship between telomeres and nuclear architecture.
To explore how telomere metabolism affects telomere spatial organization.
To understand the impact of pathological processes, like cancer, on telomere dynamics.

Main Methods:

Literature review of studies on telomere function and nuclear organization.
Analysis of research on telomere dynamics during cellular processes.

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Last Updated: May 25, 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

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

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Examination of cancer-related alterations in telomere spatial arrangement.

Main Results:

Telomere interactions with nuclear architecture are dynamic and cell-specific.
Replication, repair, and telomere maintenance influence telomere positioning.
Cancer significantly alters nuclear architecture, affecting telomere spatial organization and dynamics.

Conclusions:

Telomere positioning is integral to genome stability and nuclear organization.
Understanding telomere-nuclear architecture interplay is crucial for comprehending normal and pathological cellular functions.
Further research into telomere dynamics in cancer can reveal novel therapeutic targets.