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Linear mitochondrial deoxyribonucleic acid from the yeast Hansenula mrakii.

Institut Curie, Centre Universitaire, Orsay, France.

ABSTRACT

The mitochondrial deoxyribonucleic acid (mtDNA) from a petite-negative yeast, Hansenula mrakii, was studied. A linear restriction map was constructed with 11 restriction enzymes. The linearity of the genome was confirmed by direct end labeling of the molecule, followed by restriction analysis. The molecular weight of the DNA was found to be 55,000 base pairs. This is the first linear mtDNA found in yeast species. Using specific gene probes obtained from Saccharomyces cerevisiae mtDNA, we have constructed a gene map of H. mrakii mtDNA. The arrangement of genes in this linear genome was very different from the circular mtDNA of other known yeasts.

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