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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.
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
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...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
11:21

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

Published on: August 30, 2024

Pot1 and telomere maintenance.

Peter Baumann1, Carolyn Price

  • 1Howard Hughes Medical Institute, Stowers Institute for Medical Research, Kansas City, MO 64110, USA. peb@stowers.org

FEBS Letters
|May 25, 2010
PubMed
Summary
This summary is machine-generated.

Proteins called Protection of Telomeres 1 (POT1) bind single-stranded DNA at chromosome ends. This summary reviews POT1 functions in vertebrates and their evolutionary history after gene duplication events.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Telomeres protect chromosome ends from degradation and fusion.
  • Single-stranded DNA (ssDNA) overhangs at telomeres are bound by specific proteins.
  • Protection of Telomeres 1 (POT1) proteins are key players in telomere maintenance.

Purpose of the Study:

  • To summarize recent findings on POT1 protein functions in vertebrates.
  • To discuss the evolutionary history of POT1 proteins across diverse taxa.
  • To explore the impact of gene duplication on POT1 functional evolution.

Main Methods:

  • Literature review of recent studies on POT1 proteins.
  • Comparative analysis of POT1 protein functions in vertebrates.
  • Evolutionary analysis of POT1 gene duplication events in selected organisms.

Main Results:

  • POT1 proteins are crucial for vertebrate telomere end protection.
  • POT1 functions have diversified following gene duplication events.
  • Evolutionary trajectories of POT1 proteins vary across protozoa, plants, nematodes, and mice.

Conclusions:

  • POT1 proteins are essential for maintaining genome stability.
  • Gene duplication has driven functional innovation in POT1 proteins.
  • Understanding POT1 evolution provides insights into telomere biology.