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Role of calcium in the localization of maternal poly(A)+RNA and tubulin mRNA in Xenopus oocytes

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Summary

Poly(A)+RNA and tubulin mRNA are localized in the periphery of Xenopus oocytes and become delocalized during meiotic maturation. Delocalization of this RNA can be triggered by incubation in agents which reduce entry of calcium ions into the cell (e.g. lanthanum chloride and verapamil). Although these agents ordinarily promote meiotic maturation, addition of theophylline to the medium will inhibit maturation but not delocalization. Manipulations which prevent calcium entry without inducing meiotic maturation (e.g. calcium-free buffer) are also shown to trigger disruption of the RNA localization. In addition, manipulations which reduce chloride efflux from the cell (e.g. increasing the external chloride ion concentration with choline chloride) result in disruption of the localization of poly (A)+ RNA and tubulin mRNA without inducing meiotic maturation. The calcium-dependent chloride efflux present in Xenopus oocytes disappears after the oocyte has been stimulated to proceed through meiotic maturation. We show that reduction of the influx of calcium ions or efflux of chloride ions induces the delocalization of poly (A)+RNA and tubulin mRNA without inducing meiotic maturation. We suggest, therefore, that reducing the transmembrane movement of these ions is likely to be the natural trigger for the delocalization of poly(A)+RNA and tubulin mRNA.

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Correspondence to David G. Capco.

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Larabell, C.A., Capco, D.G. Role of calcium in the localization of maternal poly(A)+RNA and tubulin mRNA in Xenopus oocytes. Roux's Arch Dev Biol 197, 175–183 (1988). https://doi.org/10.1007/BF00427921

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Key words

  • Ca2+/Cl1− transmembrane flux
  • Oocytes
  • Meiotic maturation
  • mRNA