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Article Dans Une Revue Journal of Cell Biology Année : 2007

A centriole- and RanGTP-independent spindle assembly pathway in meiosis I of vertebrate oocytes

Julien Dumont
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Petr Petri
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Franz Pellegrin
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Markus Bohnsack
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Pascale Rassinier
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Virginie Georget
Petr Kalab
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Oliver Gruss
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Sebastian Petri
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Résumé

Spindle formation is essential for stable inheritance of genetic material. Experiments in various systems indicate that Ran GTPase is crucial for meiotic and mitotic spindle assembly. Such an important role for Ran in chromatin-induced spindle assembly was initially demonstrated in Xenopus laevis egg extracts. However, the requirement of RanGTP in living meiotic cells has not been shown. In this study, we used a fluorescence resonance energy transfer probe to measure RanGTP-regulated release of importin beta. A RanGTP-regulated gradient was established during meiosis I and was centered on chromosomes throughout mouse meiotic maturation. Manipulating levels of RanGTP in mice and X. laevis oocytes did not inhibit assembly of functional meiosis I spindles. However, meiosis II spindle assembly did not tolerate changes in the level of RanGTP in both species. These findings suggest that a mechanism common to vertebrates promotes meiosis I spindle formation in the absence of chromatin-induced microtubule production and centriole-based microtubule organizing centers.

Dates et versions

hal-02155996 , version 1 (14-06-2019)

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Julien Dumont, Petr Petri, Franz Pellegrin, Marie-Emilie Terret, Markus Bohnsack, et al.. A centriole- and RanGTP-independent spindle assembly pathway in meiosis I of vertebrate oocytes. Journal of Cell Biology, 2007, 176 (3), pp.295-305. ⟨10.1083/jcb.200605199⟩. ⟨hal-02155996⟩
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