Contractile proteins and nonerythroid spectrin in the oogenesis of the clawed toad

Distribution of contractile proteins, actin and myosin, and spectrin was studied in oogenesis of X. laevis. These proteins are present already at the previtellogenic stages, where they are diffusely distributed. During vitellogenesis actin and myosin are distributed in the animal region in a fibril-...

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Published inOntogenez Vol. 23; no. 5; p. 487
Main Authors Riabova, L V, Virtanen, I, Vartiovaara, J, Vasetskiĭ, S G
Format Journal Article
LanguageRussian
Published Russia (Federation) 01.09.1992
Subjects
Actins - metabolism
Animals
Contractile Proteins - metabolism
Electrophoresis, Polyacrylamide Gel
Female
Fluorescent Antibody Technique
Immunoblotting - methods
Membrane Proteins - metabolism
Myosins - metabolism
Oocytes - growth & development
Oocytes - metabolism
Oogenesis - physiology
Spectrin
Vitellogenesis - physiology
Xenopus laevis - physiology
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Summary:Distribution of contractile proteins, actin and myosin, and spectrin was studied in oogenesis of X. laevis. These proteins are present already at the previtellogenic stages, where they are diffusely distributed. During vitellogenesis actin and myosin are distributed in the animal region in a fibril-like way, while in the vegetal one they are concentrated around the yolk platelets. In the mature oocyte, distribution of actin and myosin again becomes diffuse. Spectrin forms in the vitellogenic oocyte a network all over the cytoplasm, while in the full-grown oocyte it is localized mostly in the subcortex of the animal region and disappears during oocyte maturation. All these proteins are present in the nuclei of oocytes. Changes in distribution of actin, myosin and spectrin during oocyte maturation are discussed with reference to the cortical contractility, spatial distribution of yolk platelets and regional sensitivity to cytochalasin B.
ISSN:0475-1450