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. 1981 Sep 25;9(18):4475–4483. doi: 10.1093/nar/9.18.4475

Use of a synthetic DNA oligonucleotide to probe the precision of RNA splicing in a yeast mitochondrial petite mutant.

H F Tabak, J van der Laan, K A Osinga, J P Schouten, J H van Boom, G H Veeneman
PMCID: PMC327451  PMID: 7029466

Abstract

In some strains of Saccharomyces cerevisiae the mitochondrial gene coding for 21S rRNA is interrupted by an intron of 1143 bp. This intron contains a reading frame for 235 amino acids: Unassigned Reading Frame (URF). In order to check whether expression of this URF is required for proper splicing of precursors to 21S rRNA, the precision of RNA splicing was analysed in a petite mutant, where no mitochondrial protein synthesis is possible anymore. We have devised a new assay to monitor the precision of the splicing event. The method is of general application, provided that the sequence of the splice boundaries is known. In the case of the 21S rRNA it involves the synthesis of the DNA oligonucleotide d(CGATCCCTATTGTC( complementary to the 5' d(CGATCCCTAT) and 3' d(TGTC) borders flanking the intron in the 21S rRNA gene. The oligonucleotide is labelled with 32p at the 5'-end, hybridised to RNA and subsequently subjected to digestion with S1 nuclease. Resistance to digestion will only be observed if the correct splice-junction is made. The petite mutant we have studied contains a 21S rRNA with the same migration behaviour as wildtype 21S rRNA. In RNA blotting experiments, using an intron specific hybridisation probe, the same intermediates in splicing are found both in wild type and petite mutant. Finally the synthetic oligonucleotide hybridises to petite 21S rRNA and its thermal dissociation behaviour is indistinguishable from a hybrid formed with wildtype 21S rRNA. We conclude that expression of the URF, present in the intron of the 21S rRNA gene, is not required for processing and correct splicing of 21S ribosomal precursor RNA.

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Selected References

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