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Related Concept Videos

Telomeres and Telomerase02:41

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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...
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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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Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
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A loopy view of telomere evolution.

Titia de Lange1

  • 1Laboratory for Cell Biology and Genetics, The Rockefeller University , New York, NY, USA.

Frontiers in Genetics
|November 6, 2015
PubMed
Summary
This summary is machine-generated.

Telomere t-loops may explain the evolution of linear chromosomes in early eukaryotes. This hypothesis is reconsidered alongside the role of Group II introns in eukaryotic genome evolution.

Keywords:
DNA damageGroup II introneukaryotereplicationtelomerasetelomere

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Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Eukaryotic chromosomes are linear, unlike the circular chromosomes of many prokaryotes.
  • Telomeres, the protective caps of eukaryotic chromosomes, form complex structures like t-loops.
  • The evolutionary transition to linear chromosomes in eukaryotes remains a key question.

Purpose of the Study:

  • To revisit the t-loop hypothesis for the evolution of linear eukaryotic chromosomes.
  • To integrate the t-loop hypothesis with theories of eukaryotic genome evolution involving Group II introns.

Main Methods:

  • Reconsideration of existing hypotheses and literature.
  • Conceptual integration of telomere biology and intron evolution.

Main Results:

  • T-loops offer a plausible mechanism for managing chromosome ends during the transition to linearity.
  • Group II introns may have played a significant role in shaping early eukaryotic genomes.

Conclusions:

  • The t-loop model provides a framework for understanding the resolution of chromosome end-replication issues in early eukaryotes.
  • The integration of intron dynamics and telomere structure offers new perspectives on early eukaryotic evolution.