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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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Subtelomeres as Specialized Chromatin Domains.

Antoine Hocher1,2, Angela Taddei3,4

  • 1MRC London Institute of Medical Sciences (LMS), Du Cane Road, London, W12 0NN, UK.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|March 18, 2020
PubMed
Summary

Subtelomeres, chromosome regions near telomeres, are defined by chromatin features, not just genes. These subtelomeric chromatin properties drive adaptation and evolution in organisms like yeast.

Keywords:
chromatinchromatin evolutionchromosomehistonessubtelomeretelomere

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Area of Science:

  • Genetics
  • Molecular Biology
  • Chromatin Biology

Background:

  • Chromosomal linearity has specific features beyond telomeres.
  • Subtelomeres are chromosome domains adjacent to telomeres, characterized by unique gene content and rapid evolution.
  • Current subtelomere definitions are primarily gene-centered and based on synteny.

Purpose of the Study:

  • To define subtelomeres using chromatin features extending beyond telomeric heterochromatin.
  • To explore the role of chromatin properties in subtelomere characteristics and function.
  • To integrate gene content dynamics with chromatin features for a comprehensive subtelomere definition.

Main Methods:

  • Summarizing recent findings on fission and budding yeast.
  • Analyzing chromatin features associated with subtelomeric regions.
  • Comparing gene-centered definitions with chromatin-based properties.

Main Results:

  • Chromatin features offer a broader definition of subtelomeres beyond gene content.
  • Subtelomeric chromatin contributes significantly to their unique properties and functions.
  • These chromatin characteristics are crucial for organismal adaptation.

Conclusions:

  • Subtelomere definition should incorporate chromatin properties alongside gene content.
  • Chromatin features play a pivotal role in the emergence and function of subtelomeres.
  • Understanding subtelomeric chromatin is key to understanding genome evolution and adaptation.