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First published online 30 November 2005
doi: 10.1242/dev.02179

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The centrosome-nucleus complex and microtubule organization in the Drosophila oocyte

Jens Januschke^1,*, Louis Gervais^1,*, Laurent Gillet¹, Guy Keryer², Michel Bornens² and Antoine Guichet^1,

¹ Institut Jacques Monod, Unité Mixte Recherche 7592, CNRS, Université Paris 6 et Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, France.
² Institut Curie, Section Recherche, Unité Mixte Recherche 144, CNRS, 75248 Paris, France.

Author for correspondence (e-mail: guichet{at}ijm.jussieu.fr)

Accepted 25 October 2005

Molecular motors transport the axis-determining mRNAs oskar, bicoid and gurken along microtubules (MTs) in the Drosophila oocyte. However, it remains unclear how the underlying MT network is organized and how this transport takes place. We have identified a centriole-containing centrosome close to the oocyte nucleus. Remarkably, the centrosomal components, -tubulin and Drosophila pericentrin-like protein also strongly accumulate at the periphery of this nucleus. MT polymerization after cold-induced disassembly in wild type and in gurken mutants suggests that in the oocyte the centrosome-nucleus complex is an active center of MT polymerization. We further report that the MT network comprises two perpendicular MT subsets that undergo dynamic rearrangements during oogenesis. This MT reorganization parallels the successive steps in localization of gurken and oskar mRNAs. We propose that in addition to a highly polarized microtubule scaffold specified by the cortex oocyte, the repositioning of the nucleus and its tightly associated centrosome could control MT reorganization and, hence, oocyte polarization.

Key words: Microtubule organization, Nucleus, Centrosome, Polarity, Oocyte, Oogenesis, Drosophila

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