title: Preferential deletion of a specific region of mitochondrial DNA in Saccharomyces cerevisiae by ethidium bromide and 3-carbethoxy-psoralen: directional retention of DNA sequence.
abstract: Grande strains of Saccharomyces cerevisiae were mutagenized either by ethidium bromide or by 3-carbethoxy-psoralen (a monofunctional furocoumarin derivative) activated by 365nm light. 973 primary rho- clones induced were randomly collected and analyzed individually for the presence or absence of fifteen mitochondrial genetic markers. 1. Under mild conditions of mutagenesis, 83% of the primary clones showed single-deletion genotypes; a unique order of 14 markers could be deduced from the patterns of the deletion. The gene order confirmed our previous map constructed from the analysis of established non-random petite clones. From the frequencies of disjunction between markers, the distance separating 14 mitochondrial markers were estimated. 2. One region, carrying oxi-3, pho-1 and mit 175 loci, was preferentially lost in rho- mutants: there is a strong constraint in the frequencies of various genotypes found in rho- clones. On each side of this particular region, a bidirectionally oriented pattern of retention of markers is observed.
mesh_terms: D001483:Base Sequence; D003374:Coumarins / Q000494:pharmacology*; D004272:DNA, Mitochondrial / Q000235:genetics*; D004996:Ethidium / Q000494:pharmacology*; D005363:Ficusin / Q000494:pharmacology*; D011564:Furocoumarins; D005796:Genes; D008040:Genetic Linkage; D012441:Saccharomyces cerevisiae / Q000235:genetics
chemical_list: D003374:Coumarins; D004272:DNA, Mitochondrial; D011564:Furocoumarins; C017104:3-carbethoxypsoralen; D004996:Ethidium; D005363:Ficusin