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Related Experiment Videos

Golgi duplication in Trypanosoma brucei.

Cynthia Y He1, Helen H Ho, Joerg Malsam

  • 1Department of Cell Biology, Ludwig Institute for Cancer Research, Yale University School of Medicine, 333 Cedar St., P.O. Box 208002, New Haven, CT 06520-8002, USA.

The Journal of Cell Biology
|May 13, 2004
PubMed
Summary

The Golgi apparatus in Trypanosoma brucei duplicates de novo early in the cell cycle. New Golgi and ER export sites form near the old Golgi, receiving material from it.

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Area of Science:

  • Cell biology
  • Parasitology
  • Molecular biology

Background:

  • The Golgi apparatus is crucial for protein modification and transport.
  • Understanding Golgi duplication is key to cell cycle progression in eukaryotes.
  • Trypanosoma brucei presents a unique model for studying organelle duplication.

Purpose of the Study:

  • To investigate the duplication process of the Golgi apparatus in Trypanosoma brucei.
  • To determine the origin and timing of new Golgi formation.
  • To elucidate the relationship between Golgi duplication and the endoplasmic reticulum (ER) export site.

Main Methods:

  • Tagging Golgi proteins with Green Fluorescent Protein (GFP) variants.
  • Live-cell video microscopy to observe Golgi dynamics.

Related Experiment Videos

  • Photobleaching experiments to trace protein movement.
  • Pharmacological treatments to identify factors influencing duplication site.

    • Main Results:

    • A new Golgi apparatus forms de novo approximately two hours into the cell cycle.
    • The new Golgi grows over two hours to match the size of the existing Golgi.
    • Duplication of the ER export site mirrors the Golgi duplication timeline.
    • The new Golgi receives material partly from the existing Golgi, not solely from the new ER export site.
    • Basal body position dictates the location of new Golgi and ER export site formation.

    Conclusions:

    • Golgi duplication in Trypanosoma brucei is a de novo process initiated near the parent Golgi.
    • The ER export site and Golgi duplication are coordinated events.
    • The basal body plays a critical role in spatial organization of organelle duplication.