Abstract
We have investigated the structure and organization of the mitochondrial genomes of two related ori r ( ori-rearranged) spontaneous petite mutants of Saccharomyces cerevisiae. In these mutant genomes every repeat unit contains an inverted terminal duplication harboring a second (inverted) ori sequence, and tandem pairs of repeat units alternate with tandem pairs in inverted orientation. We have shown that ori r genomes are organized as the genomes with inverted repeat units of ethidium bromide (EtBr)-induced petites, and we have clarified the mechanism by which such mutant mitochondrial genomes arise.
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