Related Experiment Video

Updated: Jul 17, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
08:34

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Published on: April 13, 2015

Telomerase abrogation dramatically accelerates TRF2-induced epithelial carcinogenesis

Raquel Blanco1, Purificación Muñoz, Juana M Flores

  • 1Telomeres and Telomerase Group, Molecular Oncology Program, Spanish National Cancer Centre (CNIO), Madrid 28029, Spain.

Genes & Development
|January 20, 2007
PubMed

Insights

Overexpressed TRF2 protein acts as a potent oncogene, accelerating epithelial cancer in mice lacking telomerase. This suggests telomerase inhibition may not treat cancers with high TRF2 levels.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • Telomere Repeat-Binding Factor 2 (TRF2) is crucial for telomere protection and length regulation.
  • TRF2 overexpression is observed in some human tumors, indicating a potential role in cancer development.
  • Previous studies showed TRF2 overexpression in mice leads to short telomeres and UV-induced carcinogenesis due to deregulated DNA repair.

Purpose of the Study:

  • To investigate the oncogenic potential of TRF2 in combination with telomerase deficiency in vivo.
  • To elucidate the mechanisms underlying TRF2-induced carcinogenesis in the absence of telomerase.
  • To assess the impact on chromosomal stability, DNA damage, and telomere maintenance.

Main Methods:

  • Generation of K5TRF2/Terc-/- mice with TRF2 overexpression and telomerase deficiency.
  • Analysis of epithelial carcinogenesis progression, chromosomal instability, and DNA damage.
  • Evaluation of telomere recombination as a mechanism for telomere maintenance.

Main Results:

  • Telomerase deficiency dramatically accelerated TRF2-induced epithelial carcinogenesis in K5TRF2/Terc-/- mice.
  • Accelerated carcinogenesis was associated with increased chromosomal instability and DNA damage.
  • Increased telomere recombination was observed, suggesting TRF2 promotes alternative lengthening of telomeres (ALT).

Conclusions:

  • Combined TRF2 overexpression and telomerase deficiency act as a potent oncogenic event, accelerating carcinogenesis.
  • Derepression of telomere recombination is a key feature in TRF2-driven tumorigenesis.
  • Telomerase inhibition may be ineffective against tumors with upregulated TRF2, highlighting the need for alternative therapeutic strategies.

More Related Videos

Droplet Digital TRAP (ddTRAP): Adaptation of the Telomere Repeat Amplification Protocol to Droplet Digital Polymerase Chain Reaction06:38

Droplet Digital TRAP (ddTRAP): Adaptation of the Telomere Repeat Amplification Protocol to Droplet Digital Polymerase Chain Reaction

Published on: May 3, 2019

Generation of Cancer Cell Clones to Visualize Telomeric Repeat-containing RNA TERRA Expressed from a Single Telomere in Living Cells09:13

Generation of Cancer Cell Clones to Visualize Telomeric Repeat-containing RNA TERRA Expressed from a Single Telomere in Living Cells

Published on: January 17, 2019

Related Concept Videos

Telomeres and Telomerase02:41

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 Telomerase02:41

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 Senescence02:15

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 Eukaryotes01:29

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 Eukaryotes02:31

Replication in Eukaryotes

Overview
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...