Induction and characterization of mitochondrial DNA mutants in Chlamydomonas reinhardtii

doi:10.1083/jcb.108.4.1221

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Induction and characterization of mitochondrial DNA mutants in Chlamydomonas reinhardtii

RF Matagne, MR Michel-Wolwertz, C Munaut, C Duyckaerts and F Sluse
Departement de Botanique, Universite de Liege, Sart Tilman, Belgium.

In addition to lethal minute colony mutations which correspond to loss of mitochondrial DNA, acriflavin induces in Chlamydomonas reinhardtii a low percentage of cells that grow in the light but do not divide under heterotrophic conditions. Two such obligate photoautotrophic mutants were shown to lack the cyanide-sensitive cytochrome pathway of the respiration and to have a reduced cytochrome c oxidase activity. In crosses to wild type, the mutations are transmitted almost exclusively from the mating type minus parent. A same pattern of inheritance is seen for the mitochondrial DNA in crosses between the two interfertile species C. reinhardtii and Chlamydomonas smithii. Both mutants have a deletion in the region of the mitochondrial DNA containing the apocytochrome b gene and possibly the unidentified URFx gene.
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