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An oligodeoxynucleotide containing 27 nucleotides, complementary to a highly conserved sequence of beta-tubulin mRNAs, led to a nearly complete inhibition of beta-tubulin synthesis in Xenopus oocytes after microinjection. Inhibition persisted 24 hours post-injection and was specific for beta-tubulin as the synthesis of alpha-tubulin as well as that of other proteins from the oocyte was not affected. Complete inhibition of beta-tubulin synthesis did not prevent progesterone-induced meiotic maturation and formation of the chromosome spindle. This result indicates that the pool of endogenous tubulin already present in fully-grown oocytes is sufficient to allow normal meiotic maturation. This finding correlates with previous experiments showing that the turn-over of tubulin is very slow in the oocyte.
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