Ontogenez 1992 Jan 01;234:390-400.

[The distribution and relation to the cytoskeleton of specific prosomal proteins in the oogenesis of the clawed toad].

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Using immunoblotting and immunofluorescent microscopy, we showed the presence in Xenopus laevis oocytes of two prosomal proteins (27 and 31-33 kDa) and studied their distribution during oogenesis. In the ooplasm, both proteins are detected in prosomal clusters of various size. During previtellogenesis, prosomal proteins are diffusely distributed in the nucleoplasm and form evenly distributed clusters in the cytoplasm. During oocyte growth, prosomal proteins disappear from the nucleus and form animal-vegetal and cortical gradients in the cytoplasm. In the course of oocyte maturation prosomal clusters become smaller. After artificial activation of the egg, the dorso-ventral gradient of distribution of prosomal proteins is observed. Double immunohistochemical labeling revealed morphological association between prosomal clusters and fibril-like structures of the oocyte containing actin and myosin. The latter are then replaced by diffusely distributed actin and myosin. Thus, correlation is observed between localization of the acto-myosin complex of the oocyte and that of prosomal proteins.

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Species referenced: Xenopus laevis
Genes referenced: actl6a