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Confocal microscopy of F-actin distribution in Xenopus oocytes

Published online by Cambridge University Press:  26 September 2008

Amy D. Roeder  and
David L. Gard
Amy D. Roeder
Affiliation:
Department of Biology, University of Utah, Salt Lake City, Utah, USA.
David L. Gard*
Affiliation:
Department of Biology, University of Utah, Salt Lake City, Utah, USA.
*
David L. Gard, Department of Biology, University of Utah, Salt Lake City, UT 84112, USA. Tel: 801-581-7365. Fax: 801-581-4668.
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Summary

We have used rhodamine-conjugated phalloidin and confocal microscopy to examine the organisation of filamentous actin (F-actin) during oogenesis in Xenopus laevis. F-actin was restricted to a thin shell in the cortex of oogonia and post-mitotic oocytes less than 35 μm in diameter. In oocytes with diameters of 35–50 μm F-actin was observed in three cellular domains: in the cortex, in the germinal vesicle (GV) and in a network of cytoplasmic cables. Initially, actin cables were sparsely distributed in the cytoplasm, with no evidence of discrete organising centres. In larger stage I oocytes, a dense network of actin cables extended throughout the cytoplasm, linking the GV and mitochondrial mass to the cortical actin shell. Apart from the F-actin associated with the mitochondrial mass, no evidence of a polarised distribution of F-actin was apparent in stage I oocytes. F-actin was observed also in the cortex and the GV of stage VI oocytes, and a network of cytoplasmic cables surrounded the GV. Cytoplasmic actin cables extended from the GV to the animal cortex, and formed a three-dimensional network surrounding clusters of yolk platelets in the vegetal cytoplasm. Finally, disruption of F-actin in stage VI oocytes with cytochalasin resulted in distortion and apparent rotation of the GV in the animal hemisphere, suggesting that actin plays a role in maintaining the polarised organisation of amphibian oocytes.

Keywords

Amphibian oogenesisCytoskeletonMicrofilamentsPhalloidin
Type
Article
Information
Zygote , Volume 2 , Issue 2 , May 1994 , pp. 111 - 124
Copyright
Copyright © Cambridge University Press 1994

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