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. 1990 Aug 25;18(16):4751–4757. doi: 10.1093/nar/18.16.4751

Targeted degradation of mRNA in Xenopus oocytes and embryos directed by modified oligonucleotides: studies of An2 and cyclin in embryogenesis.

J M Dagle 1, J A Walder 1, D L Weeks 1
PMCID: PMC331936  PMID: 1697675

Abstract

We have designed antisense oligodeoxyribonucleotides which are both highly resistant to nucleolytic degradation and also serve as substrates for ribonuclease H. Using these compounds we have targeted the specific degradation of several maternal mRNAs present in Xenopus laevis oocytes and early embryos. Several internucleoside linkages at both the 3' and 5' ends of the oligonucleotides were modified as phosphoramidates to provide complete protection against exonucleases, the predominant nucleolytic activity found in both oocytes and embryos. Eight Internal linkages were left unmodified to provide a substrate for RNase H. Degradation of specific embryonic mRNAs was accomplished using subtoxic amounts of the modified oligonucleotides. Specific depletion of An2, a localized mRNA encoding the alpha subunit of the mitochondrial ATPase, produced embryos that gastrulated later than control embryos and arrested in development prior to neurulation. A modified oligonucleotide targeting Xenopus cyclin B1 and cyclin B2 mRNA was also synthesized. Following the injection of one blastomere of a two-cell embryo with the anti-cyclin oligonucleotide, cell division in that half of the embryo was inhibited, demonstrating the in vivo importance of these cyclins in mitosis. The oligonucleotide analogs described here should be useful in studying developmentally significant proteins in Xenopus.

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