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Imaging Centrosomes in Fly Testes
Published on: September 20, 2013
Golgi duplication in Trypanosoma brucei requires Centrin2.
Cynthia Y He1, Marc Pypaert, Graham Warren
1Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.
Science (New York, N.Y.)
|October 29, 2005
Summary
Centrins are vital for cell structure. In Trypanosoma brucei, TbCentrin2 localizes to a novel Golgi-associated structure, revealing its role in new Golgi assembly.
Area of Science:
- Cell biology
- Parasitology
- Molecular biology
Background:
- Centrins are conserved centrosome proteins essential for basal body duplication and flagellum formation in Trypanosoma brucei.
- The centrosome in T. brucei includes the basal body, which nucleates the flagellum for motility.
Purpose of the Study:
- To investigate the localization and function of TbCentrin2 beyond its known role in the centrosome.
- To determine the role of TbCentrin2 in the duplication and assembly of the Golgi apparatus in T. brucei.
Main Methods:
- Immunofluorescence microscopy to visualize TbCentrin2 localization.
- RNA interference (RNAi) to deplete TbCentrin1 and TbCentrin2.
- Analysis of basal body and Golgi duplication following protein depletion.
Main Results:
- TbCentrin2 was identified in a distinct bi-lobed structure adjacent to the Golgi apparatus.
- One lobe of the TbCentrin2 structure associated with the existing Golgi, while the other associated with the forming Golgi.
- Depletion of TbCentrin1 specifically inhibited basal body duplication.
- Depletion of TbCentrin2 inhibited both basal body duplication and Golgi duplication.
Conclusions:
- TbCentrin2 has a previously unrecognized function in the duplication of the Golgi apparatus.
- A Centrin2-containing structure, separate from the basal body, serves as a site for new Golgi assembly.
- These findings expand the known roles of centrins in eukaryotic cell duplication and organelle biogenesis.
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