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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.
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...
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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.
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Replication in Eukaryotes02:31

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The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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Mec1p associates with functionally compromised telomeres.

Ronald E Hector1, Alo Ray, Bo-Ruei Chen

  • 1Department of Molecular Genetics, Cleveland Clinic Lerner College of Medicine at Case Western Reserve University, Lerner Research Institute, 9500 Euclid Avenue, NE20, Cleveland, OH 44195, USA.

Chromosoma
|February 1, 2012
PubMed
Summary
This summary is machine-generated.

The study reveals that Mec1p, a kinase, binds to compromised telomeres during yeast cell aging. This association is linked to telomere shortening and prevented by removing the 5' telomeric strand.

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Area of Science:

  • Cellular biology
  • Molecular genetics
  • DNA repair mechanisms

Background:

  • Telomeres protect chromosome ends, and their maintenance is crucial for genomic stability.
  • In Saccharomyces cerevisiae, telomere length is regulated by telomerase and involves ATM family kinases Tel1p and Mec1p.
  • Tel1p's role in recruiting to telomeres and promoting repeat addition is known, but Mec1p's function remains unclear.

Purpose of the Study:

  • To investigate the role of the Mec1p kinase in telomere maintenance and cellular senescence.
  • To determine the conditions under which Mec1p associates with telomeres.
  • To elucidate the relationship between Mec1p, telomere shortening, and senescence.

Main Methods:

  • Utilizing Saccharomyces cerevisiae as a model organism.
  • Observing Mec1p telomere association in cells with compromised telomere function (loss of telomerase or Ku).
  • Assessing the impact of Exonuclease I deletion on senescence and Mec1p telomere association.

Main Results:

  • Mec1p telomere association was observed during cellular senescence when telomeres were critically short.
  • Telomere dysfunction induced by telomerase loss or Ku deficiency led to Mec1p recruitment.
  • Eliminating Exonuclease I prevented both senescence and Mec1p telomere association, indicating a role for 5' strand processing.

Conclusions:

  • Mec1p associates with functionally compromised, short telomeres, unlike Tel1p.
  • Mec1p recruitment to telomeres is dependent on the processing of the 5' telomeric strand.
  • These findings shed light on the distinct roles of Mec1p and Tel1p in telomere maintenance and the cellular response to telomere dysfunction.