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Translation of ovalbumin mRNA in Xenopus laevis oocytes. Characterization of the system and effects of estrogen on injected mRNA populations.
Chan L
,
Kohler PO
,
O'Malley BW
.
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Ovalbumin messenger RNA (mRNAov) purified from hen oviduct was injected into Xenopus laevis oocytes. The oocytes were incubated in culture medium containing [3H]leucine. Analysis of the oocyte cytosol on Sephadex G-15O columns demonstrated a peak of radioactivity which cochromatographed with authentic ovalbumin. Radioactive protein contained in this peak was precipitated by ovalbumin antiserum, coelectrophoresed with ovalbumin on sodium dodecyl sulfate (SDS) and urea gels at pH 8.7, and eluted with the protein at the same pH (4.8) on CM-cellulose chromatography. Injection of increasing amounts of mRNAov was found to elicit a linear response in terms of ovalbumin synthesis. Moreover, there was linear incorporation of radioactivity into microinjected oocytes over a minimum period of 91 h. Less than 1 ng mRNAov was detected in this system. Ovalbumin mRNA activity was present in RNA preparations from chicks treated with estrogen but was undetectable in animals withdrawn from the hormone. This study constitutes an initial demonstration of a steroid hormone-induced alteration in mRNA population as assayed in intact viable heterologous cells.
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