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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 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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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Estimation of Telomeric Repeat-containing RNA from DNA/RNA Hybrid Complexes
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[The telomere position effect: silence in the back row!].

Anabelle Decottignies1

  • 1Altérations génétiques et épigénétiques des génomes, Institut de Duve, université catholique de Louvain, avenue Hippocrate 75, 1200 Bruxelles, Belgique.

Medecine Sciences : M/S
|February 28, 2014
PubMed
Summary

Telomere position effect silences genes near telomeres due to spreading heterochromatin. This review examines evidence for telomere-induced gene silencing across species, from yeast to humans.

Area of Science:

  • Genetics
  • Epigenetics
  • Molecular Biology

Background:

  • Heterochromatin, characterized by repressive histone marks, down-regulates gene transcription.
  • Without barriers, heterochromatin spreads, causing transcriptional silencing in adjacent regions.
  • Experimentally inserted transgenes near telomeric repeats are often silenced, illustrating this phenomenon.

Purpose of the Study:

  • To review evidence for the telomere position effect (TPE).
  • To explore the role of TPE in gene regulation, including potential roles in senescence.
  • To examine TPE across diverse species, from yeast to humans.

Main Methods:

  • Literature review of studies on telomere position effect.
  • Analysis of evidence for heterochromatin spreading from telomeres.

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  • Examination of natural subtelomeric barriers and their role in TPE.

    • Main Results:

    • Telomere position effect is observed in various species, silencing genes near telomeres.
    • Subtelomeric regions possess barriers that can attenuate, but not always prevent, telomere-induced silencing.
    • Telomere-induced silencing occurs at endogenous loci, with a proposed role in senescence.

    Conclusions:

    • The telomere position effect is a conserved phenomenon across eukaryotes.
    • Further research is needed to formally demonstrate the role of TPE in senescence-related gene regulation.
    • Understanding TPE is crucial for gene regulation studies and potential therapeutic interventions.