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Related Experiment Videos

t-loops at trypanosome telomeres.

J L Muñoz-Jordán1, G A Cross, T de Lange

  • 1Laboratory of Molecular Parasitology and Laboratory of Cell Biology and Genetics, Box 159, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.

The EMBO Journal
|February 7, 2001
PubMed
Summary

Telomere loops (t-loops) are conserved across eukaryotes. In Trypanosoma brucei, these structures form at chromosome ends, suggesting a common mechanism for telomere protection in diverse organisms.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Mammalian telomeres protect chromosome ends via large duplex loops (t-loops).
  • These t-loops involve the 3' TTAGGG overhang invading the duplex repeat array.
  • Trypanosoma brucei possesses abundant telomeres on numerous minichromosomes.

Purpose of the Study:

  • To investigate the presence and characteristics of t-loops in Trypanosoma brucei.
  • To determine if t-loops are a conserved feature of eukaryotic telomeres.
  • To explore the regulation of t-loop size and formation.

Main Methods:

  • Electron microscopy of psoralen/UV cross-linked DNA.
  • Analysis of enriched telomeric restriction fragments.
  • Isolation and examination of minichromosomes.

Related Experiment Videos

  • Use of Escherichia coli single-strand binding protein (SSB).

    • Main Results:

    • T-loops were identified in Trypanosoma brucei telomeres, characterized by 10-20 kb TTAGGG repeats and a 3' overhang.
    • Trypanosome t-loops were significantly smaller (approx. 1 kb) than mammalian t-loops, indicating size regulation.
    • T-loops and 3' overhangs were observed at both telomeres of minichromosomes, suggesting formation on both leading and lagging strand synthesis products.

    Conclusions:

    • T-loops are a conserved feature of eukaryotic telomeres.
    • Telomere loop formation is a fundamental mechanism for chromosome end protection.
    • T-loop size is subject to regulation, even with similar telomere lengths across species.