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Transmission of the yeast mitochondrial genome to progeny: The impact of intergenic sequences

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Summary

In a previous publication it was shown that the output of yeast mitochondrial loci lacking nearby intergenic sequences (encompassing ori/rep elements) was reduced in crosses to strains with wild-type mtDNAs. In the present work, mitochondrial genomes carrying the intergenic deletions were marked at unlinked, loci by introducing specific antibiotic resistance mutations against erythromycin, oligomycin and paromomycin. These marked genomes were used to follow the output of unlinked regions of the genome from crosses between the intergenic deletion mutants and wild-type strains. Transmission of genetically unlinked markers in coding regions was substantially reduced when an intergenic deletion was present on the same genome. In general the transmission of the antibiotic markers was the same as or slightly higher than the corresponding intergenic marker. These results indicate that the presence of an intergenic deletion in the regions studied impairs the transmission to progeny of a mitochondrial genome as a whole. More specifically, the results suggest that ori/rep sequences, present in the regions that have been deleted, confer a competitive advantage over genomes lacking a full complement of such sequences. These results support the hypothesis that intergenic sequences, and specifically ori/rep elements, have a biological role in the mitochondrial genome. However, because of the exclusive presence of ori/rep sequences in the genus Saccharomyces, it may be that these sequences evolved in (or invaded) the mitochondrial genome relatively late in the evolution of the yeasts. Therefore, in a more general sense, variations in the amount and structure of intergenic sequences in various yeasts may reflect processes that have been of selective advantage in the metabolism of individual mitochondrial DNA in a particular environment and that have not drastically interrupted the respiratory phenotype.

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  1. Plant Molecular Biology Group, Research School of Biological Sciences, The Australian National University, Canberra, Australia

    Jure Piškur

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Communicated by R. Hagemann

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Piškur, J. Transmission of the yeast mitochondrial genome to progeny: The impact of intergenic sequences. Mol Gen Genet 218, 161–168 (1989). https://doi.org/10.1007/BF00330579

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  • DOI: https://doi.org/10.1007/BF00330579

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